A high-pixel, large-surface industrial lens

Abstract

The invention discloses a high-pixel and large-surface industrial lens, comprising an optical system, wherein a focusing group with positive focal length and a fixed group with negative focal length are sequentially arranged from the object side to the image side of the optical system, the focusing group comprises a front group with positive focal length, a middle group with positive focal length, an aperture, and a rear group with positive focal length. The focal length of the optical system is f, and the focal length of the focusing group is f S1 , the focal length of the fixed group is f S2 , satisfying the relationship: 0.85<|f S1 / f|<1.20, 36.00<|f S2 / f|<38.00. The above structure achieves low distortion with a focal length of 60mm, an image-side F number of 5.0, a maximum resolution of 140lp / mm, and can match a 3.57μm pixel chip. The maximum imaging surface is φ67mm, and its pixels can reach 150 million pixels. The maximum optical distortion of the full field of view is less than 0.34%; the floating focus method is adopted, and the aperture can also be flexibly adjusted.

Description

Technical Field

[0001] The invention belongs to the technical field of optical imaging, and in particular relates to an optical system of a high-pixel and large-target-surface industrial lens. Background Art

[0002] With the continuous iteration and development of industrial lenses, small-target industrial lenses can no longer meet the testing needs of large-scale machinery manufacturing, textiles, printing, display manufacturing and other industries. There is an urgent need for industrial lenses with larger target surfaces to meet the needs of large-scale manufacturing industries. At the same time, camera chips are also developing in the direction of large size and high resolution. Currently, the IMX411 chip has appeared on the market, and its maximum chip size is The pixel size is 3.76μm, up to 150 million pixels. Correspondingly, higher requirements are placed on the optical performance of the lens. However, there are few optical lenses on the market that can match the large target surface, or they are insufficient in resolution.

[0003] Therefore, the research and development of high-resolution, large-target-area industrial lenses is more urgent. Summary of the invention

[0004] In view of the problems existing in the related art, the purpose of this application is to provide an optical lens with a higher resolution, the highest resolution can reach 140lp / mm, can match 3.57μm pixel chip, and the maximum target size is At the same time, it has low distortion performance.

[0005] In order to achieve the above-mentioned object, the present application provides a high-pixel large-surface industrial lens, comprising an optical system, wherein the optical system is provided with a focusing group S1 with positive focal power and a fixed group S2 with negative focal power in sequence from the object side to the image side; wherein the focusing group S1 comprises a front group T1 with positive focal power, a middle group T2 with positive focal power, an aperture, and a rear group T3 with positive focal power;

[0006] The front group T1 includes a first lens G1 with negative focal power and a meniscus structure; a second lens G2 with negative focal power and a biconcave structure; a third lens G3 with positive focal power and a biconvex structure; a fourth lens G4 with negative focal power and a meniscus structure; and a fifth lens G5 with positive focal power and a meniscus structure; wherein the second lens G2 and the third lens G3 are cemented into a first cemented lens group U1 with positive focal power, and the fourth lens G4 and the fifth lens G5 are cemented into a second cemented lens group U2 with positive focal power;

[0007] The middle lens group T2 includes a sixth lens G6 with negative power and a biconcave structure; a seventh lens G7 with positive power and a biconvex structure, wherein the sixth lens G6 and the seventh lens G7 are cemented into a third cemented lens group U3 with positive power;

[0008] The rear group T3 includes an eighth lens G8 with negative power and a biconcave structure; a ninth lens G9 with positive power and a biconvex structure; and a tenth lens G10 with positive power and a biconvex structure; wherein the eighth lens G8 and the ninth lens G9 are cemented into a fourth cemented lens group U4 with negative power;

[0009] The fixed group S2 includes an eleventh lens G11 with positive focal power and a meniscus structure; a twelfth lens G12 with negative focal power and a meniscus structure;

[0010] The focal length of the optical system is f, and the focal length of the focusing group S1 is f S1 , the focal length of the fixed group S2 is f S2 , respectively satisfying the relationship: 0.85<|f S1 / f|<1.20, 36.00<|f S2 / f|<38.00.

[0011] Furthermore, a distance L from a front surface vertex of the first lens G1 to a rear surface vertex of the twelfth lens G12 of the optical system and a focal length f of the optical system satisfy a relationship: |L / f|>1.85.

[0012] Furthermore, the optical back focus BFL of the optical system and the focal length f of the optical system satisfy the relationship: |BFL / f|<1.15; the half image height y` of the optical system and the focal length f of the optical system satisfy the relationship: |y` / f|<0.65.

[0013] Furthermore, the focal length of the front group T1 is f T1 , the focal length of the middle group T2 is f T2 , the focal length of the rear group T3 is f T3 , where the focal length of the front group is f T1 Ratio to the focal length f of the optical system, the focal length f of the center group T2 The ratio of the focal length f of the optical system to the focal length f of the rear group T3 The ratio of the focal length f of the optical system satisfies the relationship: 1.85<|f T1 / f|<2.10;2.90<|f T2 / f|;|f T3 / f|<3.65.

[0014] Furthermore, the focal length of the first lens G1 is f G1 , its focal length f G1 The ratio of the focal length f of the optical system satisfies the relationship: 1.10<|f G1 / f|<1.30; the focal length of the tenth lens G10 is f G10 , its focal length f G10The ratio of the focal length f of the optical system satisfies the relationship: 0.85<|f G10 / f|<1.1; the focal length of the eleventh lens G11 is f G11 , its focal length f G11 The ratio of the focal length f of the optical system satisfies the relationship: 2.60<|f G11 / f|<2.80; the focal length of the twelfth lens G12 is f G12 , its focal length f G12 The ratio of the focal length f of the optical system satisfies the relationship: 2.20<|f G12 / f|<2.40.

[0015] Furthermore, the focal length of the first cemented lens group U1 is f U1 , its focal length f U1 The ratio of the focal length f of the optical system satisfies the relationship: 6.80<|f U1 / f|<8.00; the focal length of the second cemented lens group U2 is f U2 , its focal length f U2 The ratio of the focal length f of the optical system satisfies the relationship: 1.20<|f U2 / f|<1.60; the focal length of the fourth cemented lens group U4 is f U4 , its focal length f U4 The ratio of the focal length f of the optical system satisfies the relationship: 0.90<|f U4 / f|<1.20.

[0016] Furthermore, when the object distance of the optical system changes, the relative position of the fixed group S2 and the image plane remains unchanged, and the air gap D between the focusing group S1 and the fixed group S2 is changed. t To make the image clear, the air gap D t The ratio of the focal length f of the optical system satisfies the relationship: |D t / f|<0.25.

[0017] Furthermore, each lens of the optical system is a spherical mirror, the aperture of the diaphragm of the optical system is a circular hole, and the aperture of the diaphragm is adjustable within the range of F5.0 to F32.

[0018] The technical solution provided by the present application can achieve the following beneficial effects: The present application provides a high-pixel and large-surface industrial lens, including an optical system, wherein the optical system is provided with a focusing group S1 with positive focal power and a fixed group S2 with negative focal power in sequence from the object side to the image side. The focusing group S1 includes a front group T1 with positive focal power, a middle group T2 with positive focal power, an aperture, and a rear group T3 with positive focal power; the focal length of the optical system is f, and the focal length of the focusing group S1 is f S1, the focal length of the fixed group S2 is f S2 , respectively satisfying the relationship: 0.85<|f S1 / f|<1.20, 36.00<|f S2 / f|<38.00. The present application realizes an optical system of a low-distortion optical lens with a focal length of 60mm through the above structure, an image side F number of 5.0, a maximum resolution of 140lp / mm, which can match a 3.57μm pixel chip, and a maximum imaging surface of Its pixels can reach 150 million, and the maximum optical distortion of the full field of view is less than 0.34%; it adopts a floating focus method, and its aperture can also be flexibly adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the structure of the optical system in this application.

[0021] Figure 2 It is an optical distortion curve diagram of the optical system in this application. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0023] In the description of this application, unless otherwise clearly specified and limited, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; unless otherwise specified or explained, the terms "connected", "fixed", etc. should be understood in a broad sense, for example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0024] In the description of this application, it should be understood that the term "and / or" used in this application is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0025] In the description of the present application, it should be understood that the directional words such as "upper" and "lower" described in the embodiments of the present application are described at the angles shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it should also be understood that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element. The present application is further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0026] like Figure 1 As shown, this embodiment is a high-pixel large-surface industrial lens, comprising an optical system, wherein the optical system is provided with a focusing group S1 with positive focal power and a fixed group S2 with negative focal power in sequence from the object side to the image side; wherein the focusing group S1 comprises a front group T1 with positive focal power, a middle group T2 with positive focal power, an aperture, and a rear group T3 with positive focal power;

[0027] The front group T1 includes a first lens G1 with negative power and a meniscus structure; a second lens G2 with negative power and a biconcave structure; a third lens G3 with positive power and a biconvex structure; a fourth lens G4 with negative power and a meniscus structure; and a fifth lens G5 with positive power and a meniscus structure; wherein the second lens G2 and the third lens G3 are cemented into a first cemented lens group U1 with positive power, and the fourth lens G4 and the fifth lens G5 are cemented into a second cemented lens group U2 with positive power;

[0028] The middle group T2 includes a sixth lens G6 with negative power and a biconcave structure, and a seventh lens G7 with positive power and a biconvex structure, wherein the sixth lens G6 and the seventh lens G7 are cemented into a third cemented lens group U3 with positive power;

[0029] The rear group T3 includes an eighth lens G8 with negative power and a biconcave structure; a ninth lens G9 with positive power and a biconvex structure; and a tenth lens G10 with positive power and a biconvex structure. The eighth lens G8 and the ninth lens G9 are cemented into a fourth cemented lens group U4 with negative power.

[0030] The fixed group S2 includes an eleventh lens G11 with positive power and a meniscus structure; a twelfth lens G12 with negative power and a meniscus structure;

[0031] The focal length of the optical system is f, and the focal length of the focusing group S1 is f S1 , the focal length of fixed group S2 is f S2 , respectively satisfying the relationship: 0.85<|f S1 / f|<1.20, 36.00<|f S2 / f|<38.00.

[0032] Preferably, a distance L from a front surface vertex of the first lens G1 to a rear surface vertex of the twelfth lens G12 of the optical system and a focal length f of the optical system satisfy a relationship: |L / f|>1.85.

[0033] Preferably, the optical back focus BFL of the optical system and the focal length f of the optical system satisfy the relationship: |BFL / f|<1.15; the half image height y` of the optical system and the focal length f of the optical system satisfy the relationship: |y` / f|<0.65.

[0034] Preferably, the focal length of the front group T1 is f T1 , the focal length of the middle group T2 is f T2 , the focal length of the rear group T3 is f T3 , where the focal length of the front group is f T1 Ratio to the focal length f of the optical system, the focal length f of the center group T2 The ratio of the focal length f of the optical system to the focal length f of the rear group T3 The ratio of the focal length f of the optical system satisfies the relationship: 1.85<|f T1 / f|<2.10;2.90<|f T2 / f|;|f T3 / f|<3.65.

[0035] Preferably, the focal length of the first lens G1 is f G1 , its focal length f G1 The ratio of the focal length f of the optical system satisfies the relationship: 1.10<|f G1 / f|<1.30; the focal length of the tenth lens G10 is f G10 , its focal length f G10 The ratio of the focal length f of the optical system satisfies the relationship: 0.85<|f G10 / f|<1.1; the focal length of the eleventh lens G11 is f G11 , its focal length f G11 The ratio of the focal length f of the optical system satisfies the relationship: 2.60<|f G11 / f|<2.80; the focal length of the twelfth lens G12 is fG12 , its focal length f G12 The ratio of the focal length f of the optical system satisfies the relationship: 2.20<|f G12 / f|<2.40.

[0036] Preferably, the focal length of the first cemented lens group U1 is f U1 , its focal length f U1 The ratio of the focal length f of the optical system satisfies the relationship: 6.80<|f U1 / f|<8.00; the focal length of the second cemented lens group U2 is f U2 , its focal length f U2 The ratio of the focal length f of the optical system satisfies the relationship: 1.20<|f U2 / f|<1.60; the focal length of the fourth cemented lens group U4 is f U4 , its focal length f U4 The ratio of the focal length f of the optical system satisfies the relationship: 0.90<|f U4 / f|<1.20.

[0037] Preferably, when the object distance of the optical system changes, the relative position of the fixed group S2 and the image plane remains unchanged, and the air gap D between the focusing group S1 and the fixed group S2 is changed. t To make the image clear, the ratio of the air space Dt to the focal length f of the optical system satisfies the relationship: |D t / f|<0.25.

[0038] Preferably, each lens of the optical system is a spherical mirror, the aperture of the diaphragm of the optical system is a circular hole, and the aperture of the diaphragm is adjustable within the range of F5.0 to F32.

[0039] In this example, the optical system data is as follows:

[0040]

[0041]

[0042] In this example, the focal length f of the optical system is 60 mm, the maximum aperture is F#=5.0, and the focal length f of the focusing group S1 is S1 = 64.57mm, fixed focal length f of group S2 S2 =-2225mm, the distance L from the front surface vertex of the first lens G1 to the back surface vertex of the twelfth lens G12 = 148.5mm, the optical back focus BFL = 52.5mm, the half image height y` = 33.50mm, the focal length f of the front group T1 T1 =125.28mm, focal length f of center group T2 T2 =181.19mm, focal length f of rear group T3 T3=209.61mm, the focal length of the first lens G1 is f G1 =-72.34mm, the focal length of the first cemented lens group is f U1 =443.30mm, the focal length of the second cemented lens group is f U2 =86.30mm, the focal length of the fourth cemented lens group is f U4 =-62.26mm, the focal length f of the tenth lens G10 G10 = 63.10 mm, the focal length of the eleventh lens G11 is f G11 =165.71mm, the focal length of the twelfth lens G12 is f G12 =-140.20mm, air gap D t =10mm.

[0043] Each relation: |f S1 / f|=1.07;|f S2 / f|=37.08;|L / f|=2.47;

[0044] |BFL / f|=0.87;|y` / f|=0.55;|f T1 / f|=2.08;|f T2 / f|=3.01;

[0045] |f T3 / f|=3.49;|f G1 / f|=1.20;|f U1 / f|=7.38;|f U2 / f|=1.43;

[0046] |f U4 / f|=1.03;|f G10 / f|=1.05;|f G11 / f|=2.76;|f G12 / f|=2.33;

[0047] |D t / f|=0.17;

[0048] Satisfies the relationship: 0.85<|f S1 / f|<1.20; 36.00<|f S2 / f|<38.00;

[0049] |L / f|>1.85; |BFL / f|<1.15; |y` / f|<0.65

[0050] 1.85<|f T1 / f|<2.10;2.90<|f T2 / f|、|fT3 / f|<3.65;

[0051] 1.10<|f G1 / f|<1.30;6.80<|f U1 / f|<8.00;

[0052] 1.20<|f U2 / f|<1.60;0.90<|f U4 / f|<1.20;

[0053] 0.85<|f G10 / f|<1.10;2.60<|f G11 / f|<2.80;

[0054] 2.20<|f G12 / f|<2.40;|D t / f|<0.25.

[0055] Figure 2 The optical distortion curve of this embodiment is shown, and the maximum optical distortion in the whole field of view is less than 0.34%.

[0056] The present application realizes an optical system of a low-distortion optical lens with a focal length of 60mm through the above structure, an image-side F number of 5.0, a maximum resolution of 140lp / mm, which can match a 3.57μm pixel chip, and a maximum imaging surface of Its pixels can reach 150 million, and the maximum optical distortion of the full field of view is less than 0.34%; it adopts a floating focus method, and its aperture can also be flexibly adjusted.

[0057] According to the disclosure and teaching of the above description, those skilled in the art to which the present invention belongs can also change and modify the above embodiment. Therefore, the present invention is not limited to the above specific embodiment, and any obvious improvement, replacement or modification made by those skilled in the art on the basis of the present invention belongs to the protection scope of the present invention. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the present invention.

Claims

1. A high-pixel, large-surface industrial lens, characterized by: The optical system comprises a focusing group S1 with positive optical power and a fixed group S2 with negative optical power, which are arranged in sequence from the object side to the image side; wherein the focusing group S1 comprises a front group T1 with positive optical power, a middle group T2 with positive optical power, an aperture, and a rear group T3 with positive optical power; The front group T1 includes a first lens G1 with negative focal power and a meniscus structure; a second lens G2 with negative focal power and a biconcave structure; a third lens G3 with positive focal power and a biconvex structure; a fourth lens G4 with negative focal power and a meniscus structure; and a fifth lens G5 with positive focal power and a meniscus structure; wherein the second lens G2 and the third lens G3 are cemented into a first cemented lens group U1 with positive focal power, and the fourth lens G4 and the fifth lens G5 are cemented into a second cemented lens group U2 with positive focal power; The middle lens group T2 includes a sixth lens G6 with negative power and a biconcave structure; a seventh lens G7 with positive power and a biconvex structure, wherein the sixth lens G6 and the seventh lens G7 are cemented into a third cemented lens group U3 with positive power; The rear group T3 includes an eighth lens G8 with negative power and a biconcave structure; a ninth lens G9 with positive power and a biconvex structure; and a tenth lens G10 with positive power and a biconvex structure; wherein the eighth lens G8 and the ninth lens G9 are cemented into a fourth cemented lens group U4 with negative power; The fixed group S2 includes an eleventh lens G11 with positive focal power and a meniscus structure; a twelfth lens G12 with negative focal power and a meniscus structure; The focal length of the optical system is f, and the focal length of the focusing group S1 is f S1 , the focal length of the fixed group S2 is f S2 , respectively satisfying the relationship: 0.85<|f S1 / f|<1.20, 36.00<|f S2 / f|<38.00; A distance L from a front surface vertex of the first lens G1 to a rear surface vertex of the twelfth lens G12 of the optical system and a focal length f of the optical system satisfy the relationship: |L / f|>1.85; The optical back focus BFL of the optical system and the focal length f of the optical system satisfy the relationship: | BFL / f |<1.15; the half image height y` of the optical system and the focal length f of the optical system satisfy the relationship: | y` / f |<0.65; The focal length of the front group T1 is f T1 , the focal length of the middle group T2 is f T2 , the focal length of the rear group T3 is f T3 , where the focal length of the front group is f T1 Ratio to the focal length f of the optical system, the focal length f of the center group T2 The ratio of the focal length f of the optical system to the focal length f of the rear group T3 The ratio of the focal length f of the optical system satisfies the relationship: 1.85<|f T1 / f|<2.10;2.90<|f T2 / f|; |f T3 / f|<3.65; The focal length of the first lens G1 is f G1 , its focal length f G1 The ratio of the focal length f of the optical system satisfies the relationship: 1.10<|f G1 / f|<1.30; the focal length of the tenth lens G10 is f G10 , its focal length f G10 The ratio of the focal length f of the optical system satisfies the relationship: 0.85<|f G10 / f|<1.1; the focal length of the eleventh lens G11 is f G11 , its focal length f G11 The ratio of the focal length f of the optical system satisfies the relationship: 2.60<|f G11 / f|<2.80; the focal length of the twelfth lens G12 is f G12 , its focal length f G12 The ratio of the focal length f of the optical system satisfies the relationship: 2.20<|f G12 / f|<2.40; The focal length of the first cemented lens group U1 is f U1 , its focal length f U1 The ratio of the focal length f of the optical system satisfies the relationship: 6.80<|f U1 / f|<8.00; the focal length of the second cemented lens group U2 is f U2 , its focal length f U2 The ratio of the focal length f of the optical system satisfies the relationship: 1.20<|f U2 / f|<1.60; the focal length of the fourth cemented lens group U4 is f U4 , its focal length f U4 The ratio of the focal length f of the optical system satisfies the relationship: 0.90<|f U4 / f|<1.20; When the object distance of the optical system changes, the relative position between the fixed group S2 and the image plane remains unchanged, and the air gap D between the focusing group S1 and the fixed group S2 is changed. t To make the image clear, the air gap D t The ratio of the focal length f of the optical system satisfies the relationship: |D t / f|<0.25; Each lens of the optical system is a spherical mirror, the aperture of the diaphragm of the optical system is a circular hole, and the aperture of the diaphragm is adjustable within the range of F5.0 to F32.

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