A micro camera lens

Abstract

The utility model discloses a kind of micro single-lens reflex camera lenses, including first lens, second lens, third lens, fourth lens, fifth lens and sixth lens arranged in order from object side to image side, the object side and image side of second lens and sixth lens are all convex, the object side of first lens and third lens is convex and the image side is concave, the object side of fourth lens and fifth lens is concave and the image side is convex.The utility model has only adopted six lenses, through cooperation and mutual cooperation between them, the ability that micro single-lens reflex camera lens has effective focal length is 35mm and relative aperture is 1.7 is realized, while meeting the requirement of high focal length, cost is greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of lens technology, and more particularly to a lens for a mirrorless camera. Background Technology

[0002] Cameras have become an indispensable tool in daily life. In the past, shooting distant scenes usually required a professional SLR camera with a telephoto lens. However, with the continuous development of technology, mirrorless cameras have gradually emerged. Due to their ease of operation and lightweight design, they are particularly suitable for users who travel frequently, thus the popularity of mirrorless cameras continues to increase, and their market share is steadily rising.

[0003] To meet the requirements of high focal lengths, current mirrorless camera lenses have a relatively complex structural design, especially requiring a large number of lens elements, which leads to higher lens costs. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a lens for a mirrorless camera, which aims to solve the problem that existing mirrorless camera lenses are expensive in order to achieve high focal lengths.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model provides a lens for a mirrorless camera, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially from the object side to the image side. The object side of the first lens, the second lens, and the third lens are convex and the image side is concave. The object side of the fourth lens is concave and the image side is concave. The object side and the image side of the fifth lens and the sixth lens are both convex.

[0007] Furthermore, the first lens, the second lens, the third lens, the fifth lens, and the sixth lens all have positive refractive power.

[0008] Furthermore, the fourth lens has negative refractive power.

[0009] Furthermore, it includes two laminated lenses.

[0010] Furthermore, the second lens and the third lens are cemented lenses.

[0011] Furthermore, the fourth lens and the fifth lens are cemented lenses.

[0012] The beneficial effects of this invention compared to existing technologies are as follows: A mirrorless camera lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially from the object side to the image side. The object-side surfaces of the first, second, and third lenses are convex, and the image-side surfaces are concave. The object-side surface of the fourth lens is concave, and the image-side surface is also concave. Both the object-side and image-side surfaces of the fifth and sixth lenses are convex. This invention uses only six lenses, and through their cooperation and interaction, it achieves an effective focal length of 35mm and a relative aperture of 1.7mm for a mirrorless camera lens, meeting the requirements for a high focal length while significantly reducing costs.

[0013] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model, it can be implemented according to the contents of the specification. In order to make the above and other objectives, features and advantages of this utility model more obvious and easy to understand, the following are preferred embodiments, which are described in detail below. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 A schematic diagram of the structure of a mirrorless camera lens provided for a specific embodiment of this utility model;

[0016] Figure 2 MTF diagram provided for a specific embodiment of this utility model;

[0017] Figure 3 A relative illumination diagram provided for a specific embodiment of this utility model;

[0018] Figure 4 Dispersion diagrams provided for specific embodiments of this utility model;

[0019] Figure 5 A longitudinal color difference diagram provided for a specific embodiment of this utility model;

[0020] Figure 6 Optical distortion diagram provided for a specific embodiment of this utility model.

[0021] Figure label:

[0022] 1. First lens; 2. Second lens; 3. Third lens; 4. Fourth lens; 5. Fifth lens; 6. Sixth lens. Detailed Implementation

[0023] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0028] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0029] like Figure 1 As shown, this utility model embodiment provides a mirrorless camera lens, including a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, and a sixth lens 6 arranged sequentially from the object side to the image side. The object side and image side of the fifth lens 5 and the sixth lens 6 are both convex surfaces. The object side of the first lens 1, the second lens 2, and the third lens 3 are convex surfaces and the image side is concave surfaces. The object side and image side of the fourth lens 4 are both concave surfaces.

[0030] The object-side surface of the first lens 1 is convex, which allows for the initial convergence of light rays from the object side. Its image-side surface is concave, which in turn causes some divergence of light rays. This synergistic design of the convex and concave surfaces helps to initially correct the propagation path of light rays, laying the foundation for subsequent lens processing.

[0031] The object-side surface of the second lens 2 is convex, and the image-side surface is concave, which gives the second lens 2 a strong converging effect on light. The second lens 2 works in conjunction with the first lens 1 to further converge light and compensate for the aberrations introduced by the first lens 1.

[0032] The object-side surface of the third lens 3 is convex, and the image-side surface is concave. The object-side surface of the third lens 3 is bonded to the image-side surface of the second lens 2 to form a cemented lens. The convex surface of the object-side surface, together with the second lens 2, further converges the light rays, while the concave surface of the image-side surface appropriately diverges the light rays, thereby balancing the overall optical power of the lens and correcting aberrations.

[0033] The object-side surface of the fourth lens 4 is concave, and the image-side surface is also concave. Because its object-side surface is concave, it can initially diverge light rays.

[0034] Both the object-side and image-side surfaces of the fifth lens 5 are convex. The fifth lens 5 and the fourth lens 4 are bonded together to form a cemented lens, further balancing the optical power and correcting aberrations.

[0035] The object-side and image-side surfaces of the sixth lens 6 are both convex, which helps to converge the light rays that have been processed by the preceding lenses, so that the light rays are accurately focused on the image sensor.

[0036] In one embodiment, the first lens 1, the second lens 2, the third lens 3, the fifth lens 5, and the sixth lens 6 all have positive refractive power, and the fourth lens 4 has negative refractive power.

[0037] The object-side surface of the first lens 1 is convex, and the image-side surface is concave, exhibiting positive refractive power overall. This means that the converging effect of the first lens 1 is greater than its diverging effect, thus achieving a converging effect on the light rays. When used in mirrorless camera lenses, the positive refractive power of the first lens 1 allows the lens to initially converge the light rays, ensuring the accuracy of the subsequent propagation path of the light, while also providing a good foundation for further processing of the light rays by subsequent lenses.

[0038] The second lens 2 has a convex object side and a concave image side, thus possessing strong positive refractive power. Due to its positive refractive power, the second lens 2 can not only further converge light and compensate for aberrations caused by the optical characteristics of the first lens 1, but also form a cemented lens with the third lens 3, maintaining the optical power balance of the entire lens system and improving image quality.

[0039] The object side of the third lens 3 is convex, and the image side is concave, maintaining positive refractive power overall. When the third lens 3 is cemented with the second lens 2, its positive refractive power continues to balance the optical power of the entire lens system, correcting aberrations and making light propagation more precise.

[0040] The fourth lens 4 has a concave object side and a concave image side, and thus has negative refractive power. This negative refractive power allows the fourth lens 4 to diverge light rays. Together with the fifth lens 5, it forms a cemented lens, effectively balancing the optical power of the entire lens system, compensating for various aberrations, and ensuring that light propagates to subsequent lenses at the appropriate angle.

[0041] The fifth lens 5 has convex surfaces on both its object side and image side, and possesses positive refractive power. The fifth lens 5 is cemented with the fourth lens 4, and its positive refractive power is used to further balance the optical power, correct aberrations, and ensure accurate light propagation.

[0042] The sixth lens 6 has convex surfaces on both the object side and the image side, and possesses positive refractive power. Leveraging its positive refractive power, the sixth lens 6 performs the final convergence of light rays processed by the preceding lenses, ensuring accurate focusing of the light onto the image sensor and guaranteeing image clarity and quality.

[0043] In one embodiment, the second lens 2 and the third lens 3 are cemented lenses, as are the fourth lens 4 and the fifth lens 5. This design reduces aberrations, especially at mid-to-long distances, reduces spherical aberration and coma, improves off-axis imaging quality, and reduces the overall length of the lens by 30% by replacing air gaps with cementation.

[0044] In this embodiment, the first lens 1 has a radius of curvature of 36.76 mm on the object-side surface and 83.6 mm on the image-side surface, a thickness of 3.85 mm, a refractive index of 1.9537, and an Abbe number of 32.318. The second lens 2 has a radius of curvature of 16.1 mm on the object-side surface and 22.8 mm on the image-side surface, a thickness of 4.15 mm, a refractive index of 1.9007, and an Abbe number of 37.054. The third lens 3 has a radius of curvature of 22.8 mm on the object-side surface and 11.65 mm on the image-side surface, a thickness of 1.6 mm, a refractive index of 1.9229, and an Abbe number of 18.895. The fourth lens 4 has a radius of curvature of 136.97 mm on the object-side surface and 40.7 mm on the image-side surface, a thickness of 2.21 mm, a refractive index of 1.9537, and an Abbe number of 32.318. The fifth lens 5 has a radius of curvature of 16.1 mm on the object-side surface and 325.4 mm on the image-side surface, a thickness of 2.15 mm, a refractive index of 1.8081, and an Abbe number of 22.691. The sixth lens 6 has a radius of curvature of 325.4 mm on the object-side surface and 24.16 mm on the image-side surface, a thickness of 6.5 mm, a refractive index of 1.9007, and an Abbe number of 37.054.

[0045] To better understand the technical advantages of the lens in this application, such as Figures 2 to 6 As shown, Figure 2 This is a diagram of MTF (Modulation Transfer Function). MTF is used to measure the imaging quality of a lens for targets at different spatial frequencies. Figure 2 This shows the MTF values ​​of the lens at different spatial frequencies. A higher MTF value indicates that the lens can better convey the detail and contrast of an object. From Figure 2 It is known that the lens of this application has a high MTF value at different spatial frequencies, indicating that the lens has a strong ability to transmit object details and contrast, performs well in terms of resolution, and can meet the requirements of high-resolution imaging.

[0046] Figure 3 This is a relative illumination diagram, used to show the relative illumination of the lens under different fields of view. From Figure 3It can be seen that the lens of this application has relatively stable relative illumination performance under different fields of view, which means that the light is distributed more evenly in the image and can provide relatively consistent brightness in different areas, thus ensuring the stability of image quality.

[0047] Figure 4 The figure shows excellent axial color difference control.

[0048] Figure 5 This diagram illustrates the longitudinal chromatic aberration, showcasing the lens's performance in this embodiment. The diagram provides a visual understanding of the lens's varying degrees of focus on different colors of light, thus allowing assessment of the lens's chromatic aberration control performance. Figure 5 It can be concluded that the lens of this application has good longitudinal chromatic aberration control in the embodiments, indicating that the lens has good consistency in focusing on different colors of light, effectively reducing the image color deviation problem caused by chromatic aberration.

[0049] Figure 6 This is a diagram of optical distortion. Figure 6 The chart on the right is a diagram of F-Tan (Theta) distortion. It can be seen from the chart that the maximum distortion is 3.7527%, which indicates that there is a certain degree of distortion in the optical system, but the overall degree of distortion is relatively small. Figure 6 The chart on the left is a field curvature diagram, which shows how the meridional field curvature and sagittal field curvature change with the field of view.

[0050] In summary, through the specific optical structure design of the six lenses and their coordinated operation, this mirrorless camera lens achieves an effective focal length of 35mm and a relative aperture of 1.7. While meeting the high focal length requirements, it uses only six lenses, which greatly reduces production costs.

[0051] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A micro camera lens characterized by, It includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially from the object side to the image side. The object side of the first lens, the second lens, and the third lens is convex and the image side is concave. The object side of the fourth lens is concave and the image side is concave. The object side and the image side of the fifth lens and the sixth lens are both convex.

2. A mirrorless camera lens according to claim 1, characterized in that, The first lens, the second lens, the third lens, the fifth lens, and the sixth lens all have positive refractive power.

3. The micro camera lens according to claim 1 or 2, characterized in that, The fourth lens has negative refractive power.

4. The micro camera lens of claim 1, wherein, Includes two laminated lenses.

5. A micro camera lens according to claim 4, wherein, The second lens and the third lens are cemented lenses.

6. A microcamera lens according to claim 4 or 5, characterized in that The fourth lens and the fifth lens are cemented lenses.

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