Optical lens system

Abstract

The embodiment of the utility model discloses an optical lens system which comprises a lens barrel, a five-piece lens group and at least one separator, the five-piece lens group and the separator are assembled in the lens barrel, and the lens group comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged along an optical axis from an object side to an image side; the at least one isolation piece comprises a first isolation piece arranged on the image side of the first lens, a second isolation piece arranged on the image side of the second lens, a third isolation piece arranged on the image side of the third lens and a fourth isolation piece arranged on the image side of the fourth lens; wherein any two adjacent lenses in the lens group have an air interval on the optical axis, and the air interval between the third lens and the fourth lens on the optical axis is greater than the air interval between any other two adjacent lenses in the lens group on the optical axis; the optical lens system may satisfy: 13.45 lt; cP4 / T45lt; 25.5, 25.5); 1.8 lt, 1.8 lt; t34 / (CP3 + CT3) lt; and 2.4.

Description

Technical Field

[0001] This application relates to the field of optical elements, and more particularly, to an optical lens system including multiple lenses. Background Art

[0002] With the rapid development of intelligent terminal devices such as mobile phones, people increasingly use intelligent terminal devices as daily shooting devices, and the requirements for optical lens systems are becoming more and more diverse.

[0003] Therefore, how to further optimize the structural design of the optical lens system, reduce stray light inside the lens, make the system more compact while improving the imaging quality to meet people's requirements for imaging quality has always been the goal pursued by those skilled in the art. Summary of the Utility Model

[0004] According to an embodiment of the present application, an optical lens system is provided, which includes a lens barrel, a five-piece lens group assembled in the lens barrel, and at least one spacer. Among them, the lens group includes, in order from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens; at least one spacer includes: a first spacer disposed on the image side of the first lens and at least partially contacting the image side of the first lens, a second spacer disposed on the image side of the second lens and at least partially contacting the image side of the second lens, a third spacer disposed on the image side of the third lens and at least partially contacting the image side of the third lens, and a fourth spacer disposed on the image side of the fourth lens and at least partially contacting the image side of the fourth lens; wherein, there is an air gap between any two adjacent lenses in the lens group on the optical axis, and the air gap between the third lens and the fourth lens on the optical axis is greater than the air gap between any other two adjacent lenses in the lens group on the optical axis; the maximum thickness CP4 of the fourth spacer and the air gap T45 between the fourth lens and the fifth lens on the optical axis satisfy: 13.45 < CP4 / T45 < 25.5; the air gap T34 between the third lens and the fourth lens on the optical axis, the maximum thickness CP3 of the third spacer, and the central thickness CT3 of the third lens on the optical axis satisfy: 1.8 < T34 / (CP3 + CT3) < 2.4.

[0005] In an exemplary embodiment, the curvature radius R1 of the object side surface of the first lens and the curvature radius R2 of the image side surface of the first lens satisfy: 1.25 < R1 / R2 < 1.55; and the outer diameter D1s of the object side surface of the first spacer and the effective focal length f1 of the first lens satisfy: -14.5 < f1 / D1s < -7.5.

[0006] In an exemplary embodiment, the axial distance SAG42 between the intersection of the image side surface of the fourth lens and the optical axis and the vertex of the effective semi-aperture of the image side surface of the fourth lens and the maximum thickness CP4 of the fourth spacer satisfy: -1.3 < SAG42 / CP4 < -0.95.

[0007] In an exemplary embodiment, the maximum field angle FOV of the optical lens system, the inner diameter d0m of the image-side end face of the lens barrel, and the inner diameter d0s of the object-side end face of the lens barrel satisfy: 356.2° < (d0m / d0s) * FOV < 358.05°.

[0008] In an exemplary embodiment, the inner diameter d1m of the image side surface of the first spacer and the effective focal length f2 of the second lens satisfy: 0.5 < f2 / d2m < 1.2; and the radius of curvature R4 of the image side surface of the second lens and the inner diameter d2s of the object side surface of the second spacer satisfy: -2.7 < d2s / R4 < -1.29.

[0009] In an exemplary embodiment, the effective focal length f3 of the third lens, the distance EP23 along the optical axis from the image side surface of the second spacer to the object side surface of the third spacer, and the central thickness CT3 of the third lens on the optical axis satisfy: -6.12 < f3 / (EP23 + CT3) < -3.65.

[0010] In an exemplary embodiment, the radius of curvature R5 of the object side surface of the third lens and the inner diameter d2m of the image side surface of the second spacer satisfy: 1.3 < R5 / d2m < 3.3; and the radius of curvature R6 of the image side surface of the third lens and the inner diameter d3s of the object side surface of the third spacer satisfy: 1.3 < d3s / R6 < 1.6.

[0011] In an exemplary embodiment, the combined focal length f12 of the first lens and the second lens, the maximum thickness CP1 of the first spacer, and the distance EP12 along the optical axis from the image side surface of the first spacer to the object side surface of the second spacer satisfy: 3.4 < f12 / (CP1 + EP12) < 9.45.

[0012] In an exemplary embodiment, the axial distance SAG41 between the intersection of the object side surface of the fourth lens and the optical axis and the vertex of the effective semi-aperture of the object side surface of the fourth lens, the central thickness CT4 of the fourth lens on the optical axis, and the distance EP34 along the optical axis from the image side surface of the third spacer to the object side surface of the fourth spacer satisfy: 3.2 < (|SAG41| + CT4) / EP34 < 4.

[0013] In an exemplary embodiment, the maximum thickness CP1 of the first spacer, the central thickness CT1 of the first lens on the optical axis, and the central thickness CT2 of the second lens on the optical axis satisfy: 1.9 < CT2 / (CT1 + CP1) < 2.15.

[0014] In an exemplary embodiment, at least one spacer further includes a fourth auxiliary spacer disposed on the image side of the fourth spacer and at least partially contacting the image side of the fourth spacer. The combined focal length f45 of the fourth lens and the fifth lens, the maximum thickness CP4 of the fourth spacer, and the maximum thickness CP4b of the fourth auxiliary spacer satisfy: 6.3 < f45 / (CP4 + CP4b) < 8.05.

[0015] In an exemplary embodiment, at least one spacer further includes a fourth auxiliary spacer disposed on the image side of the fourth spacer and at least partially contacting the image side of the fourth spacer. The effective focal length f5 of the fifth lens, the outer diameter D4bm of the image side surface of the fourth auxiliary spacer, and the inner diameter d4bm of the image side surface of the fourth auxiliary spacer satisfy: -8.8 < f5 / (D4bm - d4bm) < -4.8.

[0016] In an exemplary embodiment, the radius of curvature R7 of the object side surface of the fourth lens and the radius of curvature R10 of the image side surface of the fifth lens satisfy: -1.55 < R7 / R10 < -1.45; the inner diameter d4s of the object side surface of the fourth spacer and the radius of curvature R8 of the image side surface of the fourth lens satisfy: -3.2 < d4s / R8 < -2.99; and the inner diameter d4m of the image side surface of the fourth spacer and the radius of curvature R9 of the object side surface of the fifth lens satisfy: 3.3 < d4m / R9 < 4.61.

[0017] In an exemplary embodiment, the first lens has a negative optical power, its object side surface is convex, and its image side surface is concave; the second lens has a positive optical power, and its image side surface is convex; the third lens has a negative optical power, its object side surface is convex, and its image side surface is concave; the fourth lens has a positive optical power, its object side surface is concave, and its image side surface is convex; and the fifth lens has a negative optical power, its object side surface is convex, and its image side surface is concave.

[0018] In an exemplary embodiment, in at least one spacer, the maximum thickness of the fourth spacer is greater than the maximum thicknesses of the remaining spacers; the maximum thickness CP4 of the fourth spacer and the central thickness CT4 of the fourth lens on the optical axis satisfy: 0.8 < CT4 / CP4 < 1.2; and the inner diameter d4m of the image side surface of the fourth spacer, the inner diameter d4s of the object side surface of the fourth spacer, and the effective focal length f4 of the fourth lens satisfy: 1.6 < f4 / (d4m - d4s) < 3.7.

[0019] In an exemplary embodiment, the inner diameter d2s of the object side surface of the second spacer, the central thickness CT2 of the second lens on the optical axis, and the air gap T12 between the first lens and the second lens on the optical axis satisfy: 3.7 < d2s / (CT2 - T12) < 7.8.

[0020] The wide-angle optical lens system provided by this application adopts a five-piece lens group. When the maximum air gap exists between the third lens and the fourth lens, stray light is likely to occur at the edge of the effective diameter of the fourth lens, affecting the imaging quality. By satisfying 13.45 < CP4 / T45 < 25.5 and 1.8 < T34 / (CP3 + CT3) < 2.4, the edge thickness and central thickness of the third lens to the fifth lens are reasonably controlled, which is beneficial to ensuring the curvature of these three lenses, making the thickness of the lens more uniform, thereby reducing the stray light at the edge of the effective diameter of the fourth lens and improving the imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Other features, objects, and advantages of this application will become more apparent by reading the detailed description of the non-restrictive embodiments made with reference to the following drawings:

[0022] Figure 1 Shows the structure and partial parameter schematic diagram of the optical lens system according to the embodiment of this application;

[0023] Figure 2 Shows the structure schematic diagram of the optical lens system according to Embodiment 1 of this application;

[0024] Figure 3 Shows the structure schematic diagram of the optical lens system according to Embodiment 2 of this application;

[0025] Figure 4 Shows the structure schematic diagram of the optical lens system according to Embodiment 3 of this application;

[0026] 5A to 5D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical lens system according to Embodiment 1, Embodiment 2, or Embodiment 3 of this application;

[0027] Figure 6 Shows the structure schematic diagram of the optical lens system according to Embodiment 4 of this application;

[0028] Figure 7 Shows the structure schematic diagram of the optical lens system according to Embodiment 5 of this application;

[0029] Figure 8 Shows the structure schematic diagram of the optical lens system according to Embodiment 6 of this application;

[0030] 9A to 9Daxial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical lens system according to Example 4, Example 5, or Example 6 of the present application are respectively shown;

[0031] Figure 10 1 shows a schematic structural diagram of an optical lens system according to Example 7 of the present application;

[0032] Figure 11 1 shows a schematic structural diagram of an optical lens system according to Example 8 of the present application;

[0033] Figure 12 1 shows a schematic structural diagram of an optical lens system according to Example 9 of the present application;

[0034] 13A to 13D axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical lens system according to Example 7, Example 8, or Example 9 of the present application are respectively shown;

[0035] Figure 14A and Figure 14B respectively show a light path diagram and a stray energy diagram according to Comparative Example 1 of the optical lens system;

[0036] Figure 15A and Figure 15B respectively show a light path diagram and a stray energy diagram of a sample 1 according to an optical lens system;

[0037] Figure 16A and Figure 16B respectively show a light path diagram and a stray energy diagram according to Comparative Example 2 of the optical lens system; and

[0038] Figure 17A and Figure 17B An optical path diagram and a stray energy diagram of Sample 2 according to the optical lens system are respectively shown. DETAILED DESCRIPTION

[0039] For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely descriptions of exemplary embodiments of the present application and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0040] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of this application.

[0041] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0042] In this article, the paraxial region refers to the area near the optical axis. If a lens surface is convex and the location of the convex surface is undefined, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the location of the concave surface is undefined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0043] It should also be understood that the terms "comprises," "including," "having," "includes," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application." And, the term "exemplary" is intended to refer to an example or illustration.

[0044] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which this application belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and will not be interpreted in an idealized or overly formal sense unless expressly defined as such herein.

[0045] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The following embodiments only express several implementation methods of the present application, and their descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present application, several variations and improvements can be made, which all fall within the scope of protection of the present application. For example, the lens groups (i.e., the first lens to the fifth lens), the lens barrel structure, and the spacer in the various embodiments of the present application can be arbitrarily combined, and are not limited to the lens group in one embodiment being able to be combined only with the lens barrel structure, spacer, etc. of that embodiment.

[0046] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. Figure 1 The figure shows the structure arrangement of an optical lens system according to the present application and a schematic diagram of some parameters. It should be understood by those skilled in the art that some parameters commonly used in the art, such as the center thickness CT1 of the first lens on the optical axis, the air gap T12 between the first lens and the second lens on the optical axis, etc., are not shown in the figure. Figure 1 As shown in Figure 1 Only some parameters of the lens barrel and the isolator of an optical lens system of the present application are shown as examples to facilitate a better understanding of the present invention. Figure 1 As shown, CP1 represents the maximum thickness of the first isolator; CP3 represents the maximum thickness of the third isolator; CP4 represents the maximum thickness of the fourth isolator; CP4b represents the maximum thickness of the fourth auxiliary isolator; d0s represents the inner diameter of the object side end face of the lens barrel; d0m represents the inner diameter of the image side end face of the lens barrel; D1s represents the outer diameter of the object side face of the first isolator; d1s represents the inner diameter of the object side face of the first isolator; d1m represents the inner diameter of the image side face of the first isolator; d2s represents the inner diameter of the object side face of the second isolator; d2m represents the inner diameter of the image side face of the second isolator; d3s represents the inner diameter of the object side face of the third isolator; d4s represents the inner diameter of the object side face of the fourth isolator; d4bm represents the inner diameter of the image side face of the fourth auxiliary isolator; D4bm represents the outer diameter of the image side face of the fourth auxiliary isolator, and so on.

[0047] The features, principles and other aspects of the present application are described in detail below.

[0048] refer to Figures 2 to 4 、 Figures 6 to 8 as well as Figures 10 to 12 As shown, a first aspect of the present application provides an optical lens system, which may include a lens barrel, a lens group, and at least one spacer, wherein the lens group and the one or more spacers are assembled within the lens barrel. The lens group may include five lenses having optical power, namely, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, arranged in order from the object side to the image side along the optical axis. Any two adjacent lenses in the lens group may have an air gap along the optical axis.

[0049] In an exemplary embodiment, the first lens may have negative optical power. The second lens may have positive optical power. The third lens may have negative optical power. The fourth lens may have positive optical power. The fifth lens may have negative optical power.

[0050] In an exemplary embodiment, the object-side surface of the first lens may be convex, and the image-side surface may be concave. The object-side surface of the second lens may be either concave or convex, and the image-side surface may be convex. The object-side surface of the third lens may be convex, and the image-side surface may be concave. The object-side surface of the fourth lens may be concave, and the image-side surface may be convex. The object-side surface of the fifth lens may be convex, and the image-side surface may be concave.

[0051] In an exemplary embodiment, a lens assembly may include at least one trimmed lens. The outer peripheral surface of the trimmed lens may have a trimmed portion and an untrimmed portion, with the outer diameter of the trimmed portion being smaller than the outer diameter of the untrimmed portion. When the outer peripheral surface of a lens has a trimmed portion, the outer diameter of the lens generally refers to the outer diameter of the untrimmed portion of the lens.

[0052] It should be understood that the surface of each optical element (e.g., lens, spacer) closest to the object side is called the object-side surface of the optical element, and the surface of each optical element closest to the imaging plane is called the image-side surface of the optical element. A lens barrel may include an object-side end face, an image-side end face, an outer annular surface, and an inner annular surface. The end face of the lens barrel closest to the object side is the object-side end face of the lens barrel, and the end face of the lens barrel closest to the image side is the image-side end face of the lens barrel. In the direction perpendicular to the optical axis, the surface of the lens barrel farthest from the optical axis is the outer annular surface, and the surface of the lens barrel closest to the optical axis is the inner annular surface.

[0053] According to an exemplary embodiment of the present application, the optical lens system includes at least one spacer, for example, it may include any one or more of the following spacers: a first spacer placed on the image side of the first lens and at least partially in contact with the image side of the first lens, a second spacer placed on the image side of the second lens and at least partially in contact with the image side of the second lens, a third spacer placed on the image side of the third lens and at least partially in contact with the image side of the third lens, a fourth spacer placed on the image side of the fourth lens and at least partially in contact with the image side of the fourth lens, etc.

[0054] In an exemplary embodiment, at least one of the spacers may further include an auxiliary spacer, such as a fourth auxiliary spacer, which may be positioned on the image side of the fourth spacer and at least partially contact the image side of the fourth spacer. Exemplarily, the spacers and auxiliary spacers may include spacers, light shielding sheets, spacers, or pressure rings. By properly configuring the number, thickness, inner diameter, and outer diameter of the spacers, stray light can be blocked, improving the imaging quality of the optical lens system and enhancing the assembly stability of the optical lens system.

[0055] For an optical lens system according to an exemplary embodiment of the present application, the air gap between the third lens and the fourth lens on the optical axis is the largest, that is, the air gap between the third lens and the fourth lens on the optical axis is greater than the air gaps between any other two adjacent lenses in the lens group on the optical axis; the optical lens system can satisfy the following conditional expressions: 12 < CP4 / T45 < 26; 1.5 < T34 / (CP3 + CT3) < 2.5. Wherein, T34 is the air gap between the third lens and the fourth lens on the optical axis, T45 is the air gap between the fourth lens and the fifth lens on the optical axis, CP3 is the maximum thickness of the third spacer, CP4 is the maximum thickness of the fourth spacer, and CT3 is the central thickness of the third lens on the optical axis. Further, the optical lens system can satisfy: 13.45 < CP4 / T45 < 25.5; 1.8 < T34 / (CP3 + CT3) < 2.4. Satisfying 110° < FOV < 140° can achieve a large field of view of the system and meet the wide-angle shooting requirements. However, the large FOV also correspondingly makes the risk of stray light and ghost images relatively large; by satisfying 12 < CP4 / T45 < 26 and 1.5 < T34 / (CP3 + CT3) < 2.5, the edge thickness and central thickness of the third lens, the fourth lens, and the fifth lens are reasonably controlled, and the curvatures of the three lenses are ensured, which is beneficial to improving the ghost images and lens stray light of the system, thereby improving the imaging quality. At the same time, it can also ensure that the thickness of the lens is more uniform, the sagittal height to central thickness ratio is smaller, which is beneficial to the molding of the lens and the improvement of the lens yield rate.

[0056] In an exemplary embodiment, the optical lens system according to the present application can satisfy the following conditional expressions:

[0057] 1.5 < CT2 / (CT1 + CP1) < 2.5, where CP1 is the maximum thickness of the first spacer, CT1 is the central thickness of the first lens on the optical axis, and CT2 is the central thickness of the second lens on the optical axis. Further, the optical lens system can satisfy: 1.9 < CT2 / (CT1 + CP1) < 2.15. Satisfying this conditional expression is beneficial to reducing the relevant stray light on the object side of the first lens and the second lens, thereby being beneficial to improving the stray light and image quality.

[0058] In an exemplary embodiment, the optical lens system according to the present application can satisfy the following conditional expressions: 0.5 < R1 / R2 < 2; -15 < f1 / D1s < -7. Where f1 is the effective focal length of the first lens, and D1s is the outer diameter of the object side of the first spacer. Further, the optical lens system can satisfy: 1.25 < R1 / R2 < 1.55; -14.5 < f1 / D1s < -7.5. Satisfying these two conditional expressions is beneficial to improving the near-focus performance by controlling the curvature radius and effective focal length of the first lens. At the same time, the curvature of the first lens can be controlled, which is beneficial to the molding of the first lens and the control of relevant stray light, thereby improving the overall optical performance of the system.

[0059] In an exemplary embodiment, the optical lens system according to the present application may satisfy the following conditional formula: -1.5 < SAG42 / CP4 < -0.9. Wherein, SAG42 is the axial distance between the intersection point of the image side surface of the fourth lens and the optical axis and the vertex of the effective semi-aperture of the image side surface of the fourth lens, and CP4 is the maximum thickness of the fourth spacer. Further, the optical lens system may satisfy: -1.3 < SAG42 / CP4 < -0.95. Satisfying this conditional formula is conducive to enabling the fourth lens to satisfy optical imaging while ensuring a certain interval between the fourth and fifth lenses, avoiding the occurrence of assembly interference (touching) phenomena, and simultaneously ensuring the processing and forming processability of the fourth lens.

[0060] In an exemplary embodiment, the optical lens system according to the present application may satisfy the following conditional formula: 340° < (d0m / d0s)*FOV < 370°. Wherein, FOV is the maximum field angle of the optical lens system, d0m is the inner diameter of the image-side end face of the lens barrel, and d0s is the inner diameter of the object-side end face of the lens barrel. Further, the optical lens system may satisfy: 356.2° < (d0m / d0s)*FOV < 358.05°. Satisfying this conditional formula can control the size of the lens pupil by controlling the inner diameter of the object-side end face of the lens barrel, and can take into account the forming of the lens barrel and eliminate stray light at the end by controlling the inner diameter of the image-side end face of the lens barrel.

[0061] In an exemplary embodiment, the optical lens system according to the present application may satisfy the following conditional formulas: 0 < f2 / d2m < 1.5; -3 < d2s / R4 < -0.一半径,d2s为第二隔离件的物侧面的内径,d1m为第一隔离件的像侧面的内径,f1为第一透镜的有效焦距。进一步地,光学透镜系统可满足:0.5 < f2 / d2m <半径,d2s为第二隔离件的物侧面的内径,d1m为第一隔离件的像侧面的内径,f1为第一透镜的有效焦距。进一步地,光学透镜系统可满足:0.5 < f2 / d2m < 1.2; -2.7 < d2s / R4 < -1.29。满足这两个条件式,通过控制第一隔离件的像侧面内径和第二隔离件的物侧面内径,能够保证整个系统的相对亮度,同时可规避第一透镜和第二透镜部分的杂光。

[0062] It seems there is some error or repetition in the content of ID=7, which might need to be corrected in the original text for a more accurate translation.In an exemplary embodiment, the optical lens system according to the present application may satisfy the following conditional formula: -7 < f3 / (EP23 + CT3) < -3. Where f3 is the effective focal length of the third lens, CT3 is the central thickness of the third lens on the optical axis, and EP23 is the distance along the optical axis from the image side of the second spacer to the object side of the third spacer. Further, the optical lens system may satisfy: -6.12 < f3 / (EP23 + CT3) < -3.65. Satisfying this conditional formula can ensure the curvature of the third lens, which is beneficial to the MTF performance and ghost images of the system. By controlling EP23, the distance between the second lens and the third lens can be ensured, avoiding interference between the second lens and the third lens.

[0063] In an exemplary embodiment, the optical lens system according to the present application may satisfy the following conditional formulas: 1 < R5 / d2m < 4; 1 < d3s / R6 < 2. Where d2m is the inner diameter of the image side of the second spacer, d3s is the inner diameter of the object side of the third spacer, R5 is the curvature radius of the object side of the third lens, and R6 is the curvature radius of the image side of the third lens. Further, the optical lens system may satisfy: 1.3 < R5 / d2m < 3.3; 1.3 < d3s / R6 < 1.6. Satisfying these two conditional formulas is beneficial to controlling the shape of the third lens and enhancing the lens processing performance by controlling the curvature radii of the object side and the image side of the third lens. At the same time, by controlling the inner diameter of the image side of the second spacer and the inner diameter of the object side of the third spacer, it is beneficial to improving the stray light of the system and enhancing the imaging quality.

[0064] In an exemplary embodiment, the optical lens system according to the present application may satisfy the following conditional formula: 3 < f12 / (CP1 + EP12) < 10. Where f12 is the combined focal length of the first lens and the second lens, CP1 is the maximum thickness of the first spacer, and EP12 is the distance along the optical axis from the image side of the first spacer to the object side of the second spacer. Satisfying this conditional formula can reduce the inner diameter stray light of the first spacer by controlling the thickness of the first spacer. At the same time, by controlling EP12, the thickness ratio of the second lens can be ensured, which is beneficial to the processing and forming of the second lens.

[0065] In an exemplary embodiment, the optical lens system according to the present application may satisfy the following conditional formula: 3 < (|SAG41| + CT4) / EP34 < 4.3. Wherein, SAG41 is the axial distance between the intersection of the object side surface of the fourth lens and the optical axis and the vertex of the effective semi-aperture of the object side surface of the fourth lens, CT4 is the central thickness of the fourth lens, and EP34 is the distance along the optical axis from the image side surface of the third spacer to the object side surface of the fourth spacer. Further, the optical lens system may satisfy: 3.2 < (|SAG41| + CT4) / EP34 < 4. By satisfying this conditional formula, by controlling the ratio of the sum of SAG41 and CT4 to the spacing distance between the third and fourth spacers, it is beneficial to ensure the diameter-thickness ratio of the fourth lens and ensure the processing and forming of the fourth lens.

[0066] In an exemplary embodiment, for the optical lens system according to the present application, at least one spacer further includes a fourth auxiliary spacer, which is disposed on the image side of the fourth spacer and at least partially contacts the image side of the fourth spacer; and may satisfy the following conditional formula: 6 < f45 / (CP4 + CP4b) < 8.1. Wherein, f45 is the combined focal length of the fourth lens and the fifth lens, CP4b is the maximum thickness of the fourth auxiliary spacer, and CP4 is the maximum thickness of the fourth spacer. Further, the optical lens system may satisfy: 6.3 < f45 / (CP4 + CP4b) < 8.05. By satisfying this conditional formula, it is beneficial to reduce the stray light inside the fourth auxiliary spacer, avoid baking deformation, and at the same time control the maximum thickness of the fourth spacer to ensure the spacing between the third lens and the fourth lens and avoid lens collision during the dropping process of the lens.

[0067] In an exemplary embodiment, the optical lens system according to the present application may satisfy the following conditional formula: -8.8 < f5 / (D4bm - d4bm) < -4.8. Wherein, D4bm is the outer diameter of the image side surface of the fourth auxiliary spacer, d4bm is the inner diameter of the image side surface of the fourth auxiliary spacer, and f5 is the effective focal length of the fifth lens. By satisfying this conditional formula, it is beneficial to ensure the wall thickness of the lens barrel and the forming of the lens barrel, and at the same time, by controlling the difference between the outer and inner diameters of the image side surface of the fourth auxiliary spacer and the effective focal length of the fifth lens, the MTF performance of the optical system can be ensured.

[0068] In an exemplary embodiment, the optical lens system according to the present application may satisfy the following conditional equations: -1.8 < R7 / R10 < -1; -3.5 < d4s / R8 < -2.5; 3 < d4m / R9 < 5. Wherein, d4m is the inner diameter of the image side of the fourth spacer, d4s is the inner diameter of the object side of the fourth spacer, R7 is the curvature radius of the object side of the fourth lens, R8 is the curvature radius of the image side of the fourth lens, R9 is the curvature radius of the object side of the fifth lens, and R10 is the curvature radius of the image side of the fifth lens. Further, the optical lens system may satisfy: -1.55 < R7 / R10 < -1.45; -3.2 < d4s / R8 < -2.99; 3.3 < d4m / R9 < 4.61. Satisfying these three conditional equations, by controlling the curvature radii of the object side and the image side of the fourth and fifth lenses, it is beneficial to improve the performance of the lens at INF, and at the same time, the thickness uniformity of the lens can be ensured, which is beneficial to the processing and shaping of the lens.

[0069] In an exemplary embodiment, the optical lens system according to the present application may satisfy the following conditional equations: 0.5 < CT4 / CP4 < 1.5; 1.2 < f4 / (d4m - d4s) < 4. Wherein, d4m is the inner diameter of the image side of the fourth spacer, d4s is the inner diameter of the object side of the fourth spacer, f4 is the effective focal length of the fourth lens, CP4 is the maximum thickness of the fourth spacer, and CT4 is the central thickness of the fourth lens on the optical axis. Further, the optical lens system may satisfy: 0.8 < CT4 / CP4 < 1.2; 1.6 < f4 / (d4m - d4s) < 3.7. Satisfying these two conditional equations, by controlling the thickness of the fourth spacer and the curvature of the fourth lens, it is beneficial to improve the related stray light of the fourth lens, and at the same time, by controlling the inner diameters of the image side and the object side of the fourth spacer, it is beneficial to reduce the stray light on the inner inclined surface of the spacer.

[0070] In an exemplary embodiment, the optical lens system according to the present application may satisfy the following conditional equation: 3.7 < d2s / (CT2 - T12) < 7.8. Wherein, d2s is the inner diameter of the object side of the second spacer, CT2 is the central thickness of the second lens on the optical axis, and T12 is the air gap between the first lens and the second lens on the optical axis. Satisfying this conditional equation, by controlling the inner diameter of the object side of the second spacer and the diameter of the light-transmitting part on the object side of the second lens, the position of the light passing through the second lens can be effectively controlled, ultimately reducing the possibility of stray light appearing in the second lens, and at the same time ensuring the path accuracy of the imaging light of the optical system when passing through the second lens, and finally controlling the image height of each field to the required design position.

[0071] The second aspect of the present application provides an optical lens system, which may include a lens barrel, a lens group, and at least one spacer. The lens group and one or more spacers are both assembled within the lens barrel. The lens group may include five lenses with optical power, namely a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, which are sequentially arranged from the object side to the image side along the optical axis direction. There may be an air gap on the optical axis between any two adjacent lenses among the first lens to the fifth lens of the lens group.

[0072] In an exemplary embodiment, at least one spacer may include any one or more of the following spacers: a first spacer placed on the image side of the first lens and at least partially contacting the image side of the first lens, a second spacer placed on the image side of the second lens and at least partially contacting the image side of the second lens, a third spacer placed on the image side of the third lens and at least partially contacting the image side of the third lens, a fourth spacer placed on the image side of the fourth lens and at least partially contacting the image side of the fourth lens, a fourth auxiliary spacer placed on the image side of the fourth spacer and at least partially contacting the image side of the fourth spacer, etc.

[0073] In an exemplary embodiment, the first lens may have a negative optical power. The second lens may have a positive optical power. The third lens may have a negative optical power. The fourth lens may have a positive optical power. The fifth lens may have a negative optical power.

[0074] For the optical lens system according to an exemplary embodiment of the present application, among at least one spacer, the maximum thickness of the fourth spacer is greater than the maximum thicknesses of the other spacers; the optical lens system may satisfy the following conditional expressions: 0.5 < CT4 / CP4 < 1.5; 1.2 < f4 / (d4m - d4s) < 4. Here, d4m is the inner diameter of the image side surface of the fourth spacer, d4s is the inner diameter of the object side surface of the fourth spacer, f4 is the effective focal length of the fourth lens, CP4 is the maximum thickness of the fourth spacer, and CT4 is the central thickness of the fourth lens on the optical axis. Further, the optical lens system may satisfy: 0.8 < CT4 / CP4 < 1.2; 1.6 < f4 / (d4m - d4s) < 3.7. The maximum thickness of the fourth spacer has a maximum value, satisfying 0.5 < CT4 / CP4 < 1.5 and 1.2 < f4 / (d4m - d4s) < 4. By controlling the thickness of the fourth spacer and the curvature of the fourth lens, it is beneficial to improve the related stray light of the fourth lens. At the same time, by controlling the inner diameters of the image side surface and the object side surface of the fourth spacer, it is beneficial to reduce the stray light on the inner inclined surface of the spacer.

[0075] It should be understood that this application does not specifically limit the number of spacers; any number of spacers may be included between any two lenses, and the entire optical lens system may also include any number of spacers. Spacers help the optical lens system intercept excess refractive and reflective light paths, reducing stray light and ghosting. Adding auxiliary support between the spacers and the lens barrel can help alleviate issues such as poor assembly stability and low performance yield caused by large step differences between lenses.

[0076] In some embodiments, the optical lens system according to the present application may further include a filter and / or protective glass disposed between the fifth lens and the imaging surface for filtering light with different wavelengths, correcting color deviation, and protecting the photosensitive element located on the imaging surface.

[0077] In some embodiments, the optical lens system according to the present application may further include an aperture disposed between the object side and the first lens. The provision of the aperture is beneficial for effectively converging light entering the optical lens system and for reducing the aperture of the lens.

[0078] According to the optical lens system of the above-described embodiment of the present application, its lens assembly can utilize multiple lenses, such as the five lenses described above. By properly allocating the focal length, surface shape, center thickness of each lens, and the on-axis spacing between lenses, incident light can be effectively focused, the overall optical length can be reduced, and processability can be improved, making the optical lens system more convenient for production and processing.

[0079] In an embodiment of the present application, at least one of the mirror surfaces of each lens in the first to fifth lenses is an aspherical mirror surface. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, the object side surface and the image side surface of each lens in the first to fifth lenses are aspherical mirror surfaces.

[0080] Examples 1 to 9 of the optical lens system applicable to the above exemplary embodiment will be further described below with reference to the accompanying drawings.

[0081] Example 1

[0082] The following reference Figure 2 An optical lens system according to Example 1 of the present application is described.

[0083] like Figure 2 As shown, the optical lens system includes a lens barrel, a lens group and at least one spacer accommodated in the lens barrel.

[0084] The lens group includes, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4 and a fifth lens E5.

[0085] The at least one spacer includes a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, and a fourth auxiliary spacer P4b. The spacers can block stray light from entering the next lens during the imaging process, while also providing better support between the lens and the lens barrel, thereby enhancing the structural stability of the optical lens system.

[0086] The first lens E1 has negative optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens E2 has positive optical power, its object-side surface S3 is convex, and its image-side surface S4 is convex. The third lens E3 has negative optical power, its object-side surface S5 is convex, and its image-side surface S6 is concave. The fourth lens E4 has positive optical power, its object-side surface S7 is concave, and its image-side surface S8 is convex. The fifth lens E5 has negative optical power, its object-side surface S9 is convex, and its image-side surface S10 is concave. The optical lens system also includes a filter or protective glass (not shown) arranged between the fifth lens E5 and the imaging surface. The filter or protective glass has an object-side surface S11 (not shown) and an image-side surface S12 (not shown). Light from the object passes through each surface S1 to S12 in sequence and is ultimately imaged on the imaging surface.

[0087] Table 1 shows the basic parameters of the optical lens system of Example 1, wherein the units of curvature radius and thickness / distance are all millimeters (mm).

[0088]

[0089]

[0090] Table 1

[0091] In Example 1, the object-side surface and the image-side surface of any lens among the first lens E1 to the fifth lens E5 are both aspherical surfaces. The surface shape x of each aspherical lens can be defined by, but is not limited to, the following aspherical surface formula:

[0092]

[0093] Wherein, x is the distance vector height of the aspheric surface from the vertex of the aspheric surface at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. The following Tables 2-1 and 2-2 give the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A71, A72, A73, A74, A75, A80, A81, A9, A10, A11, A12, A13, A14, A15 10 、A12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 and A 30 .

[0094] Face number A4 A6 A8 A10 A12 A14 A16 S1 -2.5019E-02 -5.0155E-04 4.9268E-05 6.2412E-06 1.3718E-05 9.8780E-06 9.3228E-06 S2 -4.3572E-02 -1.5186E-03 4.2168E-04 2.5489E-05 1.4219E-05 9.4738E-06 1.9133E-05 S3 -4.1364E-02 -4.6251E-03 5.5656E-05 8.1841E-06 -6.4651E-05 1.1961E-05 -2.7374E-06 S4 4.2371E-02 -1.5512E-02 3.5716E-03 -1.8783E-03 5.7040E-04 -3.3336E-04 1.4200E-04 S5 -4.6802E-02 -8.7262E-03 4.9465E-03 -2.5842E-03 1.0977E-03 -4.9801E-04 2.7302E-04 S6 -1.9305E-01 1.3361E-02 -1.9189E-03 -7.1925E-05 7.0567E-05 -2.5476E-05 2.2916E-05 S7 2.6056E-01 3.0606E-02 1.1162E-02 -4.4238E-03 -3.1947E-04 -2.6316E-04 8.9742E-05 S8 -3.1828E-02 6.6192E-02 2.7360E-02 -7.1065E-04 -5.0106E-03 -2.6512E-03 -3.8572E-04 S9 -3.2802E+00 7.1989E-01 -1.7371E-01 4.1547E-02 -1.8076E-02 3.9939E-03 1.4274E-03 S10 -5.4845E+00 1.0399E+00 -2.9733E-01 1.1215E-01 -5.1682E-02 1.2740E-02 -7.2844E-03

[0095] Table 2-1

[0096] Face number A18 A20 A22 A24 A26 A28 A30 S1 3.6911E-06 2.4528E-07 -1.8487E-06 -1.2795E-06 5.7127E-08 5.8606E-07 -1.4244E-07 S2 1.1328E-05 8.3318E-06 -3.2018E-07 -1.2790E-06 -1.9684E-06 4.4289E-07 6.9148E-08 S3 1.8985E-05 3.1917E-06 1.0684E-05 -1.0409E-06 8.4894E-07 -3.1244E-06 8.3324E-07 S4 -6.2099E-05 2.7678E-05 -1.4163E-05 4.8238E-06 -2.7075E-07 1.6531E-07 -9.3823E-08 S5 -1.2703E-04 6.3513E-05 -3.1695E-05 1.3184E-05 -4.6713E-06 1.4391E-06 -2.3390E-07 S6 -8.5900E-06 3.0841E-06 -1.3143E-06 -6.0297E-07 9.0334E-07 -9.5190E-07 2.8392E-07 S7 -6.9009E-05 3.0940E-06 -2.7540E-05 1.0759E-05 -1.8101E-05 5.5696E-06 2.2256E-06 S8 2.6930E-04 2.0465E-04 5.1540E-05 7.8397E-06 1.3152E-05 1.4970E-05 -1.3526E-05 S9 -6.6932E-04 -4.1215E-05 -7.8235E-04 2.2786E-04 -2.2072E-04 -3.0479E-04 -9.6497E-05 S10 4.9045E-03 9.1850E-04 4.1436E-04 -2.8493E-04 5.3733E-06 8.8738E-05 -2.9728E-05

[0097] Table 2-2

[0098] Figure 5A The axial chromatic aberration curve of the optical lens system of Example 1 is shown, which indicates the deviation of the convergence point of light of different wavelengths passing through the lens. Figure 5B Astigmatism curves of the optical lens system of Example 1 are shown, which indicate meridional field curvature and sagittal field curvature. Figure 5C The distortion curve of the optical lens system of Example 1 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 5D The chromatic aberration curve of the optical lens system of Example 1 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. 5A to 5D It can be seen that the optical lens system provided in Example 1 can achieve good imaging quality.

[0099] Example 2

[0100] The following reference Figure 3 The optical lens system according to Example 2 of the present application is described. In this embodiment and the following embodiments, some descriptions similar to Example 1 will be omitted for the sake of brevity.

[0101] like Figure 3 As shown, the optical lens system includes a lens barrel, a lens assembly housed within the barrel, and at least one spacer. The lens assembly includes, from object side to image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5. The at least one spacer includes a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, and a fourth auxiliary spacer P4b.

[0102] The parameters such as materials, curvature radius, center thickness, and spacing distances between lenses and higher-order coefficients of the optical lens system of this embodiment are the same as those of embodiment 1, as shown in Table 1, Table 2-1, and Table 2-2. In addition, the number of spacers included in the optical lens system of this embodiment is the same as that of embodiment 1. The only difference is that the actual parameters of the lens barrel and each spacer are different, such as the size of the lens barrel, the thickness of the spacer, the inner diameter of the spacer, the outer diameter of the spacer, and the spacing distance between the spacers. In other words, the main structure for imaging is the same, while the auxiliary structure for imaging is different. Therefore, the imaging quality of the optical lens system of embodiment 2 of the present application is as follows: 5A to 5D shown.

[0103] Example 3

[0104] The following reference Figure 4 The optical lens system according to Example 3 of the present application is described. In this embodiment and the following embodiments, some descriptions similar to those in Example 1 will be omitted for the sake of brevity.

[0105] like Figure 4 As shown, the optical lens system includes a lens barrel, a lens assembly housed within the barrel, and at least one spacer. The lens assembly includes, from object side to image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5. The at least one spacer includes a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, and a fourth auxiliary spacer P4b.

[0106] The parameters such as materials, curvature radius, center thickness, and spacing distances between lenses and higher-order coefficients of the optical lens system of this embodiment are the same as those of embodiment 1, as shown in Table 1, Table 2-1, and Table 2-2. In addition, the number of spacers included in the optical lens system of this embodiment is also the same as that of embodiment 1. The only difference is that the actual parameters of the lens barrel and each spacer are different, such as the size of the lens barrel, the thickness of the spacer, the inner diameter of the spacer, the outer diameter of the spacer, and the spacing distance between the spacers. In other words, the main structure for imaging is the same, while the auxiliary structure for imaging is different. Therefore, the imaging quality of the optical lens system of embodiment 3 of the present application is as follows: 5A to 5D shown.

[0107] Example 4

[0108] The following reference Figure 6 An optical lens system according to Example 4 of the present application is described.

[0109] like Figure 6As shown, the optical lens system includes a lens barrel, a lens group and at least one spacer accommodated in the lens barrel.

[0110] The lens group includes, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4 and a fifth lens E5.

[0111] The at least one spacer includes a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, and a fourth auxiliary spacer P4b. The spacers can block stray light from entering the next lens during the imaging process, while also providing better support between the lens and the lens barrel, thereby enhancing the structural stability of the optical lens system.

[0112] The first lens E1 has negative optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens E2 has positive optical power, its object-side surface S3 is concave, and its image-side surface S4 is convex. The third lens E3 has negative optical power, its object-side surface S5 is convex, and its image-side surface S6 is concave. The fourth lens E4 has positive optical power, its object-side surface S7 is concave, and its image-side surface S8 is convex. The fifth lens E5 has negative optical power, its object-side surface S9 is convex, and its image-side surface S10 is concave. The optical lens system also includes a filter or protective glass (not shown) disposed between the fifth lens E5 and the imaging surface. The filter or protective glass has an object-side surface S11 and an image-side surface S12. Light from the object passes through each surface S1 to S12 in sequence and is ultimately imaged on the imaging surface.

[0113] Table 3 shows the basic parameters of the optical lens system of Example 4, wherein the units of curvature radius and thickness / distance are all millimeters (mm).

[0114]

[0115] Table 3

[0116] In Example 4, the object-side surface and the image-side surface of any lens among the first lens E1 to the fifth lens E5 are aspherical surfaces, and the surface shape x of each aspherical lens can be defined by the formula (1) given in Example 1 above.

[0117] Tables 4-1 and 4-2 below give the high-order coefficients A4, A6, A8, A9, A10, A21, A32, A43, A64, A70, A81, A91, A102, A113, A114, A115, A116, A117, A118, A119, A120, A121, A122, A123, A124 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 and A30 .

[0118]

[0119]

[0120] Table 4-1

[0121] Face number A18 A20 A22 A24 A26 A28 A30 S1 2.6846E-06 -2.9747E-06 -3.4037E-06 -1.2495E-06 1.1936E-06 4.6990E-07 -1.8788E-07 S2 5.3700E-06 5.6043E-06 2.5767E-06 -1.1319E-06 -6.9022E-07 5.5816E-07 -1.1288E-07 S3 1.3253E-05 -4.7498E-06 1.3564E-05 -1.3660E-06 3.8188E-06 -3.8752E-06 7.8713E-07 S4 -7.8267E-05 4.1813E-05 -2.4825E-05 1.1056E-05 -5.7666E-06 4.4249E-06 -9.4358E-07 S5 -1.4005E-04 7.1479E-05 -3.9811E-05 2.1990E-05 -1.0621E-05 8.4046E-06 -2.4024E-06 S6 -1.3989E-05 -1.1129E-05 6.7443E-06 -6.5744E-06 4.8678E-06 -2.8445E-06 1.0013E-06 S7 -1.7108E-04 3.4435E-05 -6.1139E-05 1.8746E-05 -3.3711E-05 1.4876E-05 1.1356E-06 S8 1.8935E-04 1.6578E-04 4.0859E-05 4.8738E-05 1.0235E-05 3.3009E-05 -2.5086E-05 S9 6.4840E-05 1.8633E-04 7.2377E-05 1.1867E-04 -8.5937E-05 -1.3307E-04 5.6546E-05 S10 2.4786E-03 -1.7441E-03 -1.1856E-04 -6.8638E-05 1.9356E-04 -3.3789E-05 2.5934E-05

[0122] Table 4-2

[0123] Figure 9A The axial chromatic aberration curve of the optical lens system of Example 4 is shown, which indicates the deviation of the convergence point of light of different wavelengths passing through the lens. Figure 9B The astigmatism curve of the optical lens system of Example 4 is shown, which indicates the meridional field curvature and the sagittal field curvature. Figure 9C The distortion curve of the optical lens system of Example 4 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 9D The chromatic aberration curve of the optical lens system of Example 4 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. 9A to 9D It can be seen that the optical lens system provided in Example 4 can achieve good imaging quality.

[0124] Example 5

[0125] The following reference Figure 7 Describe the optical lens system according to Example 5 of the present application.

[0126] like Figure 7 As shown, the optical lens system includes a lens barrel, a lens assembly housed within the barrel, and at least one spacer. The lens assembly includes, from object side to image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5. The at least one spacer includes a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, and a fourth auxiliary spacer P4b.

[0127] The parameters such as materials, curvature radius, center thickness, and spacing distances between lenses and higher-order coefficients of the optical lens system of this embodiment and embodiment 4 are the same as those of the first to fifth lenses, as shown in Table 3, Table 4-1, and Table 4-2. In addition, the number of spacers included in the optical lens system of this embodiment and embodiment 4 is also the same. The only difference is that the actual parameters of the lens barrel and each spacer are different, such as the size of the lens barrel, the thickness of the spacer, the inner diameter of the spacer, the outer diameter of the spacer, and the spacing distance between the spacers. In other words, the main structure for imaging is the same, while the auxiliary structure for imaging is different. Therefore, the imaging quality of the optical lens system of embodiment 5 of the present application is as follows: 9A to 9D shown.

[0128] Example 6

[0129] The following reference Figure 8 Describe the optical lens system according to Example 6 of the present application.

[0130] like Figure 8 As shown, the optical lens system includes a lens barrel, a lens assembly housed within the barrel, and at least one spacer. The lens assembly includes, from object side to image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5. The at least one spacer includes a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, and a fourth auxiliary spacer P4b.

[0131] The parameters such as materials, curvature radius, center thickness, and spacing distances between lenses and higher-order coefficients of the optical lens system of this embodiment and embodiment 4 are the same as those of the first to fifth lenses, as shown in Table 3, Table 4-1, and Table 4-2. In addition, the number of spacers included in the optical lens system of this embodiment and embodiment 4 is also the same. The only difference is that the actual parameters of the lens barrel and each spacer are different, such as the size of the lens barrel, the thickness of the spacer, the inner diameter of the spacer, the outer diameter of the spacer, and the spacing distance between the spacers. In other words, the main structure for imaging is the same, while the auxiliary structure for imaging is different. Therefore, the imaging quality of the optical lens system of embodiment 6 of the present application is as follows: 9A to 9D shown.

[0132] Example 7

[0133] The following reference Figure 10 Describe the optical lens system according to Example 7 of the present application.

[0134] like Figure 10As shown, the optical lens system includes a lens barrel, a lens assembly housed within the barrel, and at least one spacer. The lens assembly includes, from object side to image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5. The at least one spacer includes a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, and a fourth auxiliary spacer P4b.

[0135] The first lens E1 has negative optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens E2 has positive optical power, its object-side surface S3 is concave, and its image-side surface S4 is convex. The third lens E3 has negative optical power, its object-side surface S5 is convex, and its image-side surface S6 is concave. The fourth lens E4 has positive optical power, its object-side surface S7 is concave, and its image-side surface S8 is convex. The fifth lens E5 has negative optical power, its object-side surface S9 is convex, and its image-side surface S10 is concave. The optical lens system also includes a filter or protective glass (not shown) disposed between the fifth lens E5 and the imaging surface. The filter or protective glass has an object-side surface S11 and an image-side surface S12. Light from the object passes through each surface S1 to S12 in sequence and is ultimately imaged on the imaging surface.

[0136] Table 5 shows the basic parameters of the optical lens system of Example 7, wherein the units of curvature radius and thickness / distance are all millimeters (mm).

[0137]

[0138]

[0139] Table 5

[0140] In Example 7, the object-side surface and the image-side surface of any lens from the first lens E1 to the fifth lens E5 are aspherical surfaces, and the surface shape x of each aspherical lens can be defined by the formula (1) given in Example 1 above.

[0141] Tables 6-1 and 6-2 below give the high-order coefficients A4, A6, A8, A9, A10, A21, A32, A43, A64, A70, A81, A91, A102, A113, A114, A115, A116, A117, A118, A119, A120, A121, A122, A123, A124 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 and A 30 .

[0142] Face number A4 A6 A8 A10 A12 A14 A16 S1 -2.8571E-02 -8.6625E-04 -3.7953E-05 -3.0353E-05 -1.9806E-05 -8.2657E-07 1.1237E-06 S2 -5.6366E-02 -4.6984E-03 2.1950E-04 -1.1814E-04 -1.1495E-04 -3.8232E-05 -5.6079E-06 S3 -4.5823E-02 -5.6585E-03 1.8642E-04 -9.2977E-06 -2.3511E-04 -3.5665E-05 -3.3411E-05 S4 5.4831E-02 -1.1887E-02 4.1057E-03 -1.7371E-03 4.6460E-04 -3.5067E-04 1.4309E-04 S5 -5.7740E-02 -7.2648E-03 5.0165E-03 -2.6646E-03 1.1883E-03 -5.4113E-04 3.2555E-04 S6 -2.5094E-01 1.6732E-02 -3.9438E-03 2.0236E-04 -2.0833E-04 4.1198E-05 -2.8987E-05 S7 3.2739E-01 4.0314E-02 1.0542E-02 -5.8683E-03 3.2857E-04 -7.4983E-05 2.2984E-05 S8 -1.3063E-02 7.8176E-02 2.8233E-02 -3.1227E-03 -6.2116E-03 -2.1095E-03 1.8102E-04 S9 -2.6808E+00 4.9579E-01 -1.0735E-01 3.3130E-02 -7.4928E-03 -1.0666E-03 -6.2042E-04 S10 -4.7827E+00 8.2609E-01 -2.5807E-01 9.4068E-02 -3.0113E-02 1.2759E-02 -6.6278E-03

[0143] Table 6-1

[0144] Face number A18 A20 A22 A24 A26 A28 A30 S1 3.9949E-06 -4.8422E-06 -3.6839E-06 -1.5079E-06 2.1814E-06 1.4929E-07 -1.7336E-07 S2 9.2003E-06 1.1277E-05 5.3223E-06 3.7183E-07 -1.7794E-06 -4.9335E-07 2.4446E-07 S3 1.7661E-05 -4.2717E-06 1.6803E-05 -1.6144E-06 3.7664E-06 -4.4319E-06 9.4548E-07 S4 -5.8650E-05 3.1432E-05 -1.4119E-05 5.5544E-06 -1.2715E-06 2.3440E-06 -4.9620E-08 S5 -1.6581E-04 8.5684E-05 -4.3809E-05 2.4165E-05 -1.0920E-05 7.8811E-06 -2.3843E-06 S6 1.0462E-05 -1.6843E-05 1.3097E-05 -1.0382E-05 5.2696E-06 -3.6007E-06 1.2654E-06 S7 -1.9238E-04 -3.2097E-06 -4.3040E-05 7.8313E-06 -2.3723E-05 -2.4887E-06 8.4258E-06 S8 3.9902E-04 9.9703E-05 -4.2428E-05 -1.4169E-05 2.7505E-05 4.1233E-05 -2.2922E-05 S9 -2.2436E-04 2.5767E-04 4.7836E-05 -8.6429E-05 7.3748E-05 -2.8544E-05 1.0197E-05 S10 6.6179E-04 -1.4859E-03 1.7003E-05 -2.7763E-04 1.3205E-04 7.4123E-06 9.7233E-05

[0145] Table 6-2

[0146] Figure 13A The axial chromatic aberration curve of the optical lens system of Example 7 is shown, which indicates the deviation of the convergence point of light of different wavelengths passing through the lens. Figure 13B Astigmatism curves of the optical lens system of Example 7 are shown, which indicate meridional field curvature and sagittal field curvature. Figure 13C The distortion curve of the optical lens system of Example 7 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 13D The magnification chromatic aberration curve of the optical lens system of Example 7 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. 13A to 13D It can be seen that the optical lens system provided in Example 7 can achieve good imaging quality.

[0147] Example 8

[0148] The following reference Figure 11 Describe the optical lens system according to Example 8 of the present application.

[0149] like Figure 11 As shown, the optical lens system includes a lens barrel, a lens assembly housed within the barrel, and at least one spacer. The lens assembly includes, from object side to image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5. The at least one spacer includes a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, and a fourth auxiliary spacer P4b.

[0150] The parameters such as materials, curvature radius, center thickness, and spacing distances between lenses and higher-order coefficients of the optical lens system of this embodiment and embodiment 7 are the same as those of the first to fifth lenses, as shown in Table 5, Table 6-1, and Table 6-2. In addition, the number of spacers included in the optical lens system of this embodiment and embodiment 7 is also the same. The only difference is that the actual parameters of the lens barrel and each spacer are different, such as the size of the lens barrel, the thickness of the spacer, the inner diameter of the spacer, the outer diameter of the spacer, and the spacing distance between the spacers. In other words, the main structure for imaging is the same, while the auxiliary structure for imaging is different. Therefore, the imaging quality of the optical lens system of embodiment 8 of the present application is as follows: 13A to 13D shown.

[0151] Example 9

[0152] The following reference Figure 12An optical lens system according to Example 9 of the present application is described.

[0153] like Figure 12 As shown, the optical lens system includes a lens barrel, a lens assembly housed within the barrel, and at least one spacer. The lens assembly includes, from object side to image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5. The at least one spacer includes a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, and a fourth auxiliary spacer P4b.

[0154] The parameters such as materials, curvature radius, center thickness, and spacing distances between lenses and higher-order coefficients of the optical lens systems of this embodiment and embodiment 7 are the same as those of the first to fifth lenses, as shown in Table 5, Table 6-1, and Table 6-2. In addition, the number of spacers included in the optical lens systems of this embodiment and embodiment 7 is also the same. The only difference is that the actual parameters of the lens barrel and each spacer are different, such as the size of the lens barrel, the thickness of the spacer, the inner diameter of the spacer, the outer diameter of the spacer, and the spacing distances between the spacers. In other words, the main structure for imaging is the same, while the auxiliary structure for imaging is different. Therefore, the imaging quality of the optical lens system of embodiment 9 of the present application is as follows: 13A to 13D shown.

[0155] Table 7 below shows some parameters of the optical lens systems of Examples 1 to 9, such as the effective focal length of the optical lens system, the effective focal length of each lens, the combined focal length of some lenses, the maximum field of view (FOV), and SAG41 and SAG42. The unit of the focal length, distance, or effective radius value is millimeter (mm).

[0156]

[0157]

[0158] Table 7

[0159] Table 8 below shows some basic parameters of the lens barrels and spacers of the optical lens systems of Examples 1 to 9, such as d1s, d1m, D1s, d2s, d2m, d3s, d4s, d4m, d4bm, D4bm, d0s, d0m, CP1, EP12, EP23, CP3, EP34, CP4, and CP4b. The units of the basic parameters listed in Table 8 are all millimeters (mm).

[0160] Parameters / Example 1 2 3 4 5 6 7 8 9 d1s 1.1652 1.1652 1.1652 1.2900 1.2870 1.2870 1.1660 1.1660 1.1660 d1m 1.1652 1.1652 1.1652 1.2900 1.2870 1.2870 1.1660 1.1660 1.1660 D1s 3.0100 3.1000 3.1000 3.1000 3.1000 3.1000 3.1000 2.3730 2.3730 d2s 2.7217 1.6672 1.3056 2.7263 2.0250 1.5360 2.1800 1.7100 1.5520 d2m 3.0800 3.4000 3.3000 3.0740 2.8710 1.5360 2.8300 1.7100 1.5520 d3s 2.0000 2.0280 2.0740 2.2070 2.2010 2.3010 2.1900 2.3920 2.0920 d4s 3.0442 3.0440 3.0440 2.8474 2.8420 2.8420 2.8470 2.8470 2.8470 d4m 5.2110 5.2110 5.2110 3.9034 5.2000 5.2000 5.2000 5.2000 5.2000 d4bm 4.7280 4.7280 4.7280 4.2000 4.1940 4.1940 4.2900 4.2900 4.2900 D4bm 6.2000 6.2000 6.2000 6.2000 6.1940 6.1940 6.2000 6.2000 6.2000 d0s 2.2543 2.2543 2.2543 2.2543 2.2543 2.2543 2.2543 2.2543 2.2543 d0m 6.5246 6.5246 6.5246 6.5246 6.5246 6.5246 6.5246 6.5246 6.5246 CP1 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 EP12 0.1901 0.3147 0.3315 0.2570 0.2570 0.3270 0.2620 0.5630 0.3230 EP23 0.3635 0.5421 0.5263 0.4420 0.4690 0.6790 0.4220 0.4220 0.6630 CP3 0.0200 0.0220 0.0180 0.0220 0.0200 0.0180 0.0180 0.0200 0.0220 EP34 0.2943 0.2940 0.2940 0.2540 0.2540 0.2540 0.2740 0.2740 0.2740 CP4 0.7004 0.7100 0.7600 0.6040 0.6140 0.6340 0.6340 0.6440 0.6240 CP4b 0.0220 0.0220 0.0220 0.0220 0.0220 0.0220 0.0220 0.0220 0.0220

[0161] Table 8 In summary, in Examples 1 to 9, the optical lens systems respectively meet the conditions in Table 9 below.

[0162]

[0163]

[0164] Table 9

[0165] Figure 14A and Figure 14B An optical path diagram and a stray light energy schematic diagram of an optical lens system according to Comparative Example 1 of the optical lens system are respectively shown. Figure 15A and Figure 15B The optical path diagram and stray light energy diagram of the optical lens system according to Sample 1 are shown. According to the optical lens system of Comparative Example 1, the air spacing between the third and fourth lenses on the optical axis is the maximum air spacing between adjacent lenses in the lens group, satisfying CP4 / T45 = 8 and T34 / (CP3 + CT3) = 0.1. According to the optical lens system of Sample 1, the air spacing between the third and fourth lenses on the optical axis is the maximum, satisfying CP4 / T45 = 14.1 and T34 / (CP3 + CT3) = 1.84.

[0166] Combine Figures 14A to 15B From the comparison of the optical path diagram and the stray light spot diagram of the comparative example 1 and the sample 1, it can be seen that Figure 14A and Figure 14B The optical lens system of Comparative Example 1 shown in FIG. 1 has strong stray light energy and poor optical performance; and Figure 15A and Figure 15B The optical lens system of Sample 1 shown has significantly reduced stray light energy and has better optical performance.

[0167] Figure 16A and Figure 16B An optical path diagram and a stray light energy schematic diagram of an optical lens system according to Comparative Example 2 of the optical lens system are respectively shown. Figure 17A and Figure 17B The optical path diagram and stray light energy diagram of the optical lens system according to Sample 2 are shown. According to the optical lens system of Comparative Example 2, the air spacing between the third and fourth lenses on the optical axis is maximized, and satisfies CP4 / T45 = 30 and T34 / (CP3 + CT3) = 8. According to the optical lens system of Sample 2, the air spacing between the third and fourth lenses on the optical axis is maximized, and satisfies CP4 / T45 = 23.5 and T34 / (CP3 + CT3) = 2.34.

[0168] Combine Figures 16A to 17B From the comparison of the optical path diagram and the stray light spot diagram of the comparative example 2 and the sample 2, it can be seen that Figure 16A and Figure 16BThe stray light energy of the optical lens system of Comparative Example 2 shown is relatively strong, and the optical performance is poor; while Figure 17A and Figure 17B the stray light energy of the optical lens system of Sample 2 shown is significantly reduced, and it has better optical performance.

[0169] Through the above experimental comparison of the optical lens system, it can be found that for the optical lens systems of Sample 1 and Sample 2 according to the present application, by simultaneously satisfying the numerical range of the conditional formula 13.45 < CP4 / T45 < 25.5 and 1.8 < T34 / (CP3 + CT3) < 2.4, compared with Comparative Example 1 and Comparative Example 2 outside the conditional formula numerical range, the spot is significantly reduced, and the stray light improvement effect is better. Therefore, the optical lens system according to the embodiment of the present application can achieve a better effect of eliminating stray light.

[0170] The above description is only a preferred embodiment of the present application and an explanation of the applied technical principle. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by mutually replacing the above features with the (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. An optical lens system, characterized in that It includes a lens barrel, a five-piece lens group assembled in the lens barrel, and at least one spacer, wherein, the lens group includes, arranged in sequence from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens; the at least one spacer includes: a first spacer placed on the image side of the first lens and at least partially contacting the image side of the first lens, a second spacer placed on the image side of the second lens and at least partially contacting the image side of the second lens, a third spacer placed on the image side of the third lens and at least partially contacting the image side of the third lens, and a fourth spacer placed on the image side of the fourth lens and at least partially contacting the image side of the fourth lens; wherein, there is an air gap between any two adjacent lenses in the lens group on the optical axis, and the air gap between the third lens and the fourth lens on the optical axis is greater than the air gaps between any other two adjacent lenses in the lens group on the optical axis; the maximum thickness CP4 of the fourth spacer and the air gap T45 between the fourth lens and the fifth lens on the optical axis satisfy: 13.45 < CP4 / T45 < 25.5; the air gap T34 between the third lens and the fourth lens on the optical axis, the maximum thickness CP3 of the third spacer, and the central thickness CT3 of the third lens on the optical axis satisfy: 1.8 < T34 / (CP3 + CT3) < 2.

4.

2. The optical lens system according to claim 1, wherein: the curvature radius R1 of the object side surface of the first lens and the curvature radius R2 of the image side surface of the first lens satisfy: 1.25 < R1 / R2 < 1.55; and the outer diameter D1s of the object side surface of the first spacer and the effective focal length f1 of the first lens satisfy: -14.5 < f1 / D1s < -7.

5.

3. The optical lens system according to claim 1, wherein: the axial distance SAG42 between the intersection point of the image side surface of the fourth lens and the optical axis and the vertex of the effective semi-aperture of the image side surface of the fourth lens and the maximum thickness CP4 of the fourth spacer satisfy: -1.3 < SAG42 / CP4 < -0.

95.

4. The optical lens system according to claim 1, wherein: the maximum field angle FOV of the optical lens system, the inner diameter d0m of the image side end face of the lens barrel, and the inner diameter d0s of the object side end face of the lens barrel satisfy: 356.2° < (d0m / d0s)*FOV < 358.05°.

5. The optical lens system according to claim 1, wherein: the inner diameter d1m of the image side surface of the first spacer and the effective focal length f2 of the second lens satisfy: 0.5 < f2 / d2m < 1.2; and the curvature radius R4 of the image side surface of the second lens and the inner diameter d2s of the object side surface of the second spacer satisfy: -2.7 < d2s / R4 < -1.

29.

6. The optical lens system according to claim 1, wherein: the effective focal length f3 of the third lens, the distance EP23 along the optical axis from the image side surface of the second spacer to the object side surface of the third spacer, and the central thickness CT3 of the third lens on the optical axis satisfy: -6.12 < f3 / (EP23 + CT3) < -3.

65.

7. The optical lens system according to claim 1, wherein: The radius of curvature R5 of the object side surface of the third lens and the inner diameter d2m of the image side surface of the second spacer satisfy: 1.3 < R5 / d2m < 3.3; and The radius of curvature R6 of the image side surface of the third lens and the inner diameter d3s of the object side surface of the third spacer satisfy: 1.3 < d3s / R6 < 1.

6.

8. The optical lens system according to claim 1, wherein: The combined focal length f12 of the first lens and the second lens, the maximum thickness CP1 of the first spacer, and the distance EP12 along the optical axis from the image side surface of the first spacer to the object side surface of the second spacer satisfy: 3.4 < f12 / (CP1 + EP12) < 9.

45.

9. The optical lens system according to claim 1, wherein: The axial distance SAG41 between the intersection of the object side surface of the fourth lens and the optical axis and the vertex of the effective semi-aperture of the object side surface of the fourth lens, the central thickness CT4 of the fourth lens on the optical axis, and the distance EP34 along the optical axis from the image side surface of the third spacer to the object side surface of the fourth spacer satisfy: 3.2 < (|SAG41| + CT4) / EP34 < 4.

10. The optical lens system according to claim 1, wherein: The maximum thickness CP1 of the first spacer, the central thickness CT1 of the first lens on the optical axis, and the central thickness CT2 of the second lens on the optical axis satisfy: 1.9 < CT2 / (CT1 + CP1) < 2.

15.

11. The optical lens system according to claim 1, wherein: The at least one spacer further includes a fourth auxiliary spacer disposed on the image side of the fourth spacer and at least partially contacting the image side of the fourth spacer, The combined focal length f45 of the fourth lens and the fifth lens, the maximum thickness CP4 of the fourth spacer, and the maximum thickness CP4b of the fourth auxiliary spacer satisfy: 6.3 < f45 / (CP4 + CP4b) < 8.

05.

12. The optical lens system according to claim 1, wherein: The at least one spacer further includes a fourth auxiliary spacer disposed on the image side of the fourth spacer and at least partially contacting the image side of the fourth spacer, The effective focal length f5 of the fifth lens, the outer diameter D4bm of the image side surface of the fourth auxiliary spacer, and the inner diameter d4bm of the image side surface of the fourth auxiliary spacer satisfy: -8.8 < f5 / (D4bm - d4bm) < -4.

8.

13. The optical lens system according to claim 1, wherein: The radius of curvature R7 of the object side surface of the fourth lens and the radius of curvature R10 of the image side surface of the fifth lens satisfy: -1.55 < R7 / R10 < -1.45; The inner diameter d4s of the object side surface of the fourth spacer and the radius of curvature R8 of the image side surface of the fourth lens satisfy: -3.2 < d4s / R8 < -2.99; and The inner diameter d4m of the image side surface of the fourth spacer and the radius of curvature R9 of the object side surface of the fifth lens satisfy: 3.3 < d4m / R9 < 4.

61.

14. The optical lens system according to claim 1, wherein The first lens has a negative optical power, its object side surface is convex, and its image side surface is concave; ​ ​ The fourth lens has a positive optical power, with its object side being concave and its image side being convex; and The fifth lens has a negative optical power, with its object side being convex and its image side being concave.

15. The optical lens system according to claim 14, wherein: Among the at least one spacer, the maximum thickness of the fourth spacer is greater than the maximum thicknesses of the remaining spacers; The maximum thickness CP4 of the fourth spacer and the central thickness CT4 of the fourth lens on the optical axis satisfy: 0.8 < CT4 / CP4 < 1.2; and The inner diameter d4m of the image side of the fourth spacer, the inner diameter d4s of the object side of the fourth spacer, and the effective focal length f4 of the fourth lens satisfy: 1.6 < f4 / (d4m - d4s) < 3.

7.

16. The optical lens system according to claim 1, wherein: The inner diameter d2s of the object side of the second spacer, the central thickness CT2 of the second lens on the optical axis, and the air gap T12 between the first lens and the second lens on the optical axis satisfy: 3.7 < d2s / (CT2 - T12) < 7.8.

Images