Imaging objective optical system and imaging device
By designing a simplified four-lens optical system for imaging objective lenses, the complex structure of the existing ultra-wide-angle imaging objective lenses is solved, and the effect of low cost and high imaging quality is achieved.
Patent Information
- Application Number
- CN202323537893.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-22
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2033-12-22
AI Technical Summary
The lens structure of the existing ultra-wide-angle camera objective lens is complex, resulting in high production costs and difficult mass production.
An imaging objective lens optical system including four lenses is designed. The lenses are arranged in sequence from the object side to the image side along the optical axis. By reasonably allocating the surface shape and parameters of each lens, the lens structure is simplified and the size is achieved.
A low-cost camera objective optical system is realized, reducing production difficulty and maintaining high imaging quality and clarity within a 200° field of view angle.
Smart Images
Figure CN222280938U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of optical lenses, in particular to a camera objective optical system and a camera device. Background Art
[0002] At present, the camera objective lens of the camera device mostly adopts the Cooke three-piece structure and its improved structure. For the ultra-wide-angle improved type with a field of view of 200 degrees, the lens structure of the camera objective lens usually uses more than 6 lenses. The lens structure is relatively complex, resulting in high production costs of the camera objective lens and difficulty in mass production. Utility Model Content
[0003] The main purpose of the utility model is to provide a camera objective optical system, aiming to provide a low-cost camera objective optical system, which is conducive to mass production.
[0004] In order to achieve the above-mentioned object, the utility model proposes a camera objective optical system, comprising:
[0005] A camera objective optical system, characterized by comprising a first lens, a second lens, a third lens and a fourth lens arranged in sequence from the object side to the image side along the optical axis;
[0006] The first lens is a negative lens, the object side surface of which is convex, and the image side surface of which is concave near the optical axis;
[0007] The second lens is a positive lens, the object side surface of which is convex, and the image side surface of which is convex;
[0008] The third lens is a positive lens, whose object side surface is convex and whose image side surface is convex;
[0009] The fourth lens is a negative lens, the object side surface of which is a concave surface near the optical axis, and the image side surface of which is a flat surface.
[0010] Optionally, a curvature radius R1 of the object side surface of the first lens is 19, and a curvature radius R2 of the image side surface of the first lens is 2.406;
[0011] The curvature radius R3 of the object side surface of the second lens is 7.7, and the curvature radius R4 of the image side surface of the second lens is 7.7;
[0012] The curvature radius R5 of the object side surface of the third lens is 5.5, and the curvature radius R6 of the image side surface of the third lens is 2.5;
[0013] The curvature radius R7 of the object side surface of the fourth lens is 2.5.
[0014] Optionally, the thickness D1 of the first lens is 0.6 mm;
[0015] The air interval D2 between the second lens and the first lens is 5.66 mm, and the thickness D3 of the second lens is 4 mm;
[0016] The air interval D4 between the third lens and the second lens is 0.1 mm, and the thickness D5 of the third lens is 2.5 mm;
[0017] The image side surface of the fourth lens and the object side surface of the third lens are glued to each other, and the thickness D6 of the fourth lens is 0.5 mm.
[0018] Optionally, the aperture of the object side of the first lens is 9 mm, and the aperture of the image side is 4.7 mm;
[0019] The aperture of the object side of the second lens is 2.2 mm, and the aperture of the image side is 2.8 mm;
[0020] The aperture of the object side surface of the third lens is 3.4 mm, and the aperture of the image side surface is 3.4 mm;
[0021] The aperture of the object side surface of the fourth lens is 3.6 mm, and the aperture of the image side surface is 3.8 mm.
[0022] Optionally, the field of view FOV of the camera objective optical system is ≥200°.
[0023] Optionally, a diffuse spot diameter of the imaging objective optical system is less than 4 μm.
[0024] Optionally, the first lens, the second lens, the third lens and the fourth lens are all made of glass.
[0025] Optionally, the first lens, the second lens and the third lens are all high-refractive-index and high-Abbe-number lenses, and the fourth lens is a high-refractive-index and low-Abbe-number lens.
[0026] Optionally, the aperture value FNO of the camera objective optical system is 2.4, and the relative light transmittance is greater than 50%.
[0027] The utility model further provides a camera device, comprising any one of the above-mentioned camera objective optical systems, wherein the camera objective optical system comprises a first lens, a second lens, a third lens and a fourth lens arranged in sequence from the object side to the image side along the optical axis;
[0028] The first lens is a negative lens, the object side surface of which is convex, and the image side surface of which is concave near the optical axis;
[0029] The second lens is a positive lens, the object side surface of which is convex, and the image side surface of which is convex;
[0030] The third lens is a positive lens, whose object side surface is convex and whose image side surface is convex;
[0031] The fourth lens is a negative lens, the object side surface of which is a concave surface near the optical axis, and the image side surface of which is a flat surface.
[0032] The technical solution of the utility model is composed of four lenses arranged in sequence from the object side to the image side along the optical axis. By reasonably allocating the surface shapes of the above lenses, the camera objective optical system of the utility model has the characteristics of large field of view, high imaging quality, etc. Compared with the existing ultra-wide-angle improved photographic objective lens, the technical solution of the utility model simplifies the lens structure of the camera objective optical system, realizes the miniaturization of the camera objective optical system, thereby reducing the production cost of the camera objective optical system and reducing the difficulty of mass production of the camera objective optical system. BRIEF DESCRIPTION OF THE DRAWINGS
[0033] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.
[0034] Figure 1 It is a structural diagram of an embodiment of the camera objective optical system of the utility model;
[0035] Figure 2 for Figure 1 MTF curve diagram of the camera objective optical system;
[0036] Figure 3 for Figure 1 Point diagram of the optical system of the camera objective lens;
[0037] Figure 4 for Figure 1 Aberration diagram of light rays in the camera objective optical system;
[0038] Figure 5 for Figure 1 Left field curvature diagram and right distortion diagram of the center camera objective optical system;
[0039] Figure 6 for Figure 1 Relative illumination diagram of the camera objective optical system.
[0040] Description of Figure Numbers:
[0041] Label name Label name 100 Camera objective optical system 30 The third lens 10 First lens 40 The fourth lens 20 Second lens
[0042] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0043] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0044] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0045] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0046] In addition, in the present utility model, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.
[0047] The utility model provides an imaging objective optical system 100 .
[0048] Please refer to Figure 1In some embodiments of the utility model imaging objective optical system 100, the imaging objective optical system 100 comprises a first lens 10, a second lens 20, a third lens 30 and a fourth lens 40 which are arranged in sequence from the object side to the image side along the optical axis; the first lens 10 is a negative lens, whose object side surface is convex, and whose image side surface is concave near the optical axis; the second lens 20 is a positive lens, whose object side surface is convex, and whose image side surface is convex; the third lens 30 is a positive lens, whose object side surface is convex, and whose image side surface is convex; the fourth lens 40 is a negative lens, whose object side surface is concave near the optical axis, and whose image side surface is a plane.
[0049] In this embodiment, the object side light can pass through the first lens 10, the second lens 20, the third lens 30 and the fourth lens 40 in sequence to reach the optical sensor and form an image on the image side. Through the above four lenses, spherical aberration, coma, astigmatism and chromatic aberration can be effectively corrected. Among them, the first lens 10 is a negative lens, and its object side surface is convex and the image side surface is concave, which is conducive to collecting large field of view light to enter the rear lens. The second lens 20 and the third lens 30 are both positive lenses, and their object side surfaces and image side surfaces are convex, which is conducive to achieving a focusing effect, causing the light to be deflected at a large angle to shorten the focusing position of the light. The fourth lens 40 is a negative lens, and its object side surface is concave at the near optical axis, and the image side surface is a plane, which is conducive to effectively transmitting more light beams to the imaging surface and improving the resolution ability of the optical lens.
[0050] The imaging band of the camera objective optical system 100 is 450nm to 650nm, which can ensure good imaging quality of the camera objective optical system 100 in the visible light band. For special use requirements, the imaging band can reach 950nm to meet the imaging requirements of the near-infrared light band.
[0051] In some embodiments of the utility model imaging objective optical system 100, the curvature radius R1 of the object side surface of the first lens 10 is 19, and the curvature radius R2 of the image side surface of the first lens 10 is 2.406; the curvature radius R3 of the object side surface of the second lens 20 is 7.7, and the curvature radius R4 of the image side surface of the second lens 20 is 7.7; the curvature radius R5 of the object side surface of the third lens 30 is 5.5, and the curvature radius R6 of the image side surface of the third lens 30 is 2.5; the curvature radius R7 of the object side surface of the fourth lens 40 is 2.5. In this way, the spherical aberration, coma, astigmatism and field curvature of the imaging objective optical system 100 are reduced, and the imaging quality of the imaging objective optical system 100 is improved.
[0052] Please refer to Figure 1In some embodiments of the utility model imaging objective optical system 100, the thickness D1 of the first lens 10 is 0.6 mm; the air interval D2 between the second lens 20 and the first lens 10 is 5.66 mm, and the thickness D3 of the second lens 20 is 4 mm; the air interval D4 between the third lens 30 and the second lens 20 is 0.1 mm, and the thickness D5 of the third lens 30 is 2.5 mm; the image side surface of the fourth lens 40 and the object side surface of the third lens 30 are glued to each other, and the thickness D6 of the fourth lens 40 is 0.5 mm.
[0053] In this embodiment, the image side surface of the fourth lens 40 and the object side surface of the third lens 30 are bonded to each other to form a bonded lens, which can reduce the difficulty of assembly, reduce the risk of lens deviation during assembly of the camera objective optical system 100, and help correct the overall chromatic aberration of the optical lens. By controlling the thickness and air gap parameters of the above lenses, the external dimensions of the camera objective optical system 100 can be better constrained to achieve miniaturization of the camera objective optical system 100.
[0054] In some embodiments of the utility model camera objective optical system 100, the aperture of the object side surface of the first lens 10 is 9 mm, and the aperture of the image side surface is 4.7 mm; the aperture of the object side surface of the second lens 20 is 2.2 mm, and the aperture of the image side surface is 2.8 mm; the aperture of the object side surface of the third lens 30 is 3.4 mm, and the aperture of the image side surface is 3.4 mm; the aperture of the object side surface of the fourth lens 40 is 3.6 mm, and the aperture of the image side surface is 3.8 mm.
[0055] In some embodiments of the utility model camera objective optical system 100, the field of view FOV of the camera objective optical system 100 is ≥ 200°. This is conducive to the optical lens to achieve an ultra-wide-angle effect and to have good image quality within a field of view of at least 200°.
[0056] In some embodiments of the imaging objective optical system 100 of the utility model, the diffusion spot diameter d of the imaging objective optical system 100 is less than 4 μm, which can illustrate the characteristic of the imaging objective optical system 100 of the utility model that the imaging objective optical system 100 has clear imaging in the case of a large field of view.
[0057] In some embodiments of the utility model imaging objective optical system 100, the first lens 10, the second lens 20, the third lens 30 and the fourth lens 40 are all made of glass. The first lens 10, the second lens 20 and the third lens 30 are all high refractive index and high Abbe number lenses, and the fourth lens 40 is a high refractive index and low Abbe number lens.
[0058] In this embodiment, the first lens 10, the second lens 20 and the third lens 30 can be made of glass material with high refractive index and high Abbe number, and the fourth lens 40 can be made of glass material with high refractive index and low Abbe number. By setting the fourth lens 40 as a high refractive index and low Abbe number lens, it is beneficial to balance the chromatic aberration of the camera objective optical system 100.
[0059] In some embodiments of the imaging objective optical system 100 of the utility model, the aperture value FNO of the imaging objective optical system 100 is 2.4, and the relative light transmittance is greater than 50%.
[0060] In this way, the imaging objective optical system 100 of the present invention has the characteristic of strong light transmission capability and can achieve higher imaging clarity.
[0061] The relevant parameters of each lens in the imaging objective optical system 100 provided by the present invention are shown in the following table:
[0062]
[0063] Figures 2 to 6 The MTF curve diagram, the point diagram, the light aberration diagram, the left field curvature diagram, the right distortion diagram, and the relative illumination diagram of the imaging objective optical system 100 are shown respectively. Figure 2 The MTF curve can reflect the image clarity. The higher the MTF value, the clearer the corresponding image. Figure 3 The dot plot can reflect the aberration of the camera objective optical system 100; Figure 4 It is a light aberration diagram, which can reflect the aberration control of the lens; Figure 5 The left picture in the figure is the field curvature diagram, which can reflect the curvature of the image plane for clear imaging. Figure 5 The right picture in the figure is a distortion picture, which can reflect the deformation of the image; Figure 6 The relative illumination diagram can reflect the brightness uniformity, and the higher the value, the better the relative illumination. According to the image data measured above, it can be known that the quality of the image projected by the camera objective optical system 100 of the utility model is within the standard range of wide-angle projection images.
[0064] The utility model also provides a camera device, which includes the camera objective optical system 100 described in any of the above embodiments. The specific structure of the camera objective optical system 100 refers to any of the above embodiments. Since the camera device proposed in this application can apply all the technical solutions in all the above embodiments, it at least has all the beneficial effects brought by the above technical solutions, which will not be described one by one here.
[0065] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.
Claims
1. A camera objective optical system, characterized in that: The optical system comprises a first lens, a second lens, a third lens and a fourth lens which are sequentially arranged from the object side to the image side along the optical axis; The first lens is a negative lens, the object side surface of which is convex, and the image side surface of which is concave near the optical axis; The second lens is a positive lens, the object side surface of which is convex, and the image side surface of which is convex; The third lens is a positive lens, whose object side surface is convex and whose image side surface is convex; The fourth lens is a negative lens, the object side surface of which is a concave surface near the optical axis, and the image side surface of which is a flat surface.
2. The imaging objective optical system according to claim 1, wherein: The curvature radius R1 of the object side surface of the first lens is 19, and the curvature radius R2 of the image side surface of the first lens is 2.406; The curvature radius R3 of the object side surface of the second lens is 7.7, and the curvature radius R4 of the image side surface of the second lens is 7.7; The curvature radius R5 of the object side surface of the third lens is 5.5, and the curvature radius R6 of the image side surface of the third lens is 2.5; The curvature radius R7 of the object side surface of the fourth lens is 2.
5.
3. The imaging objective optical system according to claim 1, wherein: The thickness D1 of the first lens is 0.6 mm; The air interval D2 between the second lens and the first lens is 5.66 mm, and the thickness D3 of the second lens is 4 mm; The air interval D4 between the third lens and the second lens is 0.1 mm, and the thickness D5 of the third lens is 2.5 mm; The image side surface of the fourth lens and the object side surface of the third lens are glued to each other, and the thickness D6 of the fourth lens is 0.5 mm.
4. The imaging objective optical system according to claim 1, wherein: The aperture of the object side of the first lens is 9 mm, and the aperture of the image side is 4.7 mm; The aperture of the object side of the second lens is 2.2 mm, and the aperture of the image side is 2.8 mm; The aperture of the object side surface of the third lens is 3.4 mm, and the aperture of the image side surface is 3.4 mm; The aperture of the object side surface of the fourth lens is 3.6 mm, and the aperture of the image side surface is 3.8 mm.
5. The imaging objective optical system according to claim 1, wherein: The field of view angle FOV of the camera objective optical system is ≥200°.
6. The imaging objective optical system according to claim 1, wherein: The diffuse spot diameter d of the imaging objective optical system is less than 4 μm.
7. The imaging objective optical system according to claim 1, wherein: The first lens, the second lens, the third lens and the fourth lens are all made of glass.
8. The imaging objective optical system according to claim 1, wherein: The first lens, the second lens and the third lens are all high-refractive-index and high-Abbe-number lenses, and the fourth lens is a high-refractive-index and low-Abbe-number lens.
9. The imaging objective optical system according to claim 1, wherein: The aperture value FNO of the camera objective optical system is 2.4, and the relative light transmittance is greater than 50%.
10. A camera device, characterized in that: The invention comprises the imaging objective optical system as claimed in any one of claims 1 to 9.