A high definition lens

Abstract

This invention discloses a high-definition lens, comprising a first lens, a first cemented lens group, an aperture stop, a fourth lens, and a fifth lens arranged sequentially from the object plane to the image plane; wherein the first lens and the fourth lens have negative optical power; the first cemented lens group and the fifth lens have positive optical power, and the fifth lens has a biconvex structure; the focal length of the lens is f, and the focal length of the first cemented lens group is f. U1 f U1 The following relationship exists between f and f: 0.35 < |f U1 / f|<0.90. The lens formed by this invention is not only compact and economical, but also ensures high imaging resolution, small aperture and low distortion, which can meet the needs of industrial applications and has great market prospects and economic value.

Description

Technical Field

[0001] This invention relates to the field of machine vision lens technology, and more particularly to a high-definition lens. Background Technology

[0002] With the continuous upgrading of modern industrial automation and intelligence, the requirements for machine vision systems are also constantly increasing, especially the requirements for online real-time detection, dynamic recognition, and application compatibility. This means that machine vision optical lenses, while having a compact and small structure, must maximize resolution, widen the working distance, and expand the depth of field as much as possible to meet detection needs.

[0003] However, most of the compact optical lenses currently on the market are surveillance lenses. These lenses have varying performance specifications, large distortion, and low relative illumination, which cannot meet the needs of industrial applications.

[0004] Therefore, the development of optical lenses with small aperture, high resolution, low distortion, and compactness is even more urgent.

[0005] The above information is provided as background information only to aid in understanding this disclosure and does not constitute an assertion or admission that any of the above content can be used as prior art relative to this disclosure. Summary of the Invention

[0006] This invention provides a high-definition lens to overcome the shortcomings of existing technologies.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A high-definition lens includes a first lens G1, a first cemented lens group U1, an aperture S, a fourth lens G4, and a fifth lens G5 arranged sequentially from the object plane to the image plane; wherein,

[0009] The first lens G1 and the fourth lens G4 have negative optical power;

[0010] The first cemented lens group U1 and the fifth lens G5 have positive optical power, and the fifth lens G5 has a biconvex structure;

[0011] The focal length of the lens is f, and the focal length of the first cemented lens group U1 is f. U1 The f U1 The following relationship is satisfied with f:

[0012] 0.35<|f U1 / f|<0.90.

[0013] Furthermore, in the high-definition lens, the first cemented lens group U1 includes a second lens G2 and a third lens G3;

[0014] The second lens G2 has negative optical power and is a meniscus structure;

[0015] The third lens G3 has positive optical power and is a biconvex structure.

[0016] Furthermore, in the high-definition lens, the distance L from the vertex of the front surface of the first lens G1 to the vertex of the rear surface of the fifth lens G5 satisfies the following relationship with f:

[0017] |L / f|>1.70.

[0018] Furthermore, in the high-definition lens, the optical back intercept BFL from the vertex of the rear surface of the fifth lens G5 to the image plane satisfies the following relationship with f:

[0019] |BFL / f| < 1.10.

[0020] Furthermore, in the high-definition lens, the half-image height y' of the lens and f satisfy the following relationship:

[0021] |y' / f|<0.45.

[0022] Furthermore, in the high-definition lens, the focal length of the first lens G1 is f. G1 The f G1 The following relationship is satisfied with f:

[0023] 0.50 < |f G1 / f|<1.00.

[0024] Furthermore, in the high-definition lens, the focal length of the fourth lens G4 is f. G4 The f G4 The following relationship is satisfied with f:

[0025] 0.60 < |f G4 / f|<1.30.

[0026] Furthermore, in the high-definition lens, the focal length of the fifth lens G5 is f. G5 Its focal length f G5 The following relationship is satisfied with f:

[0027] 0.65 < |f G5 / f|<1.10.

[0028] Furthermore, in the high-definition lens, the first lens G1, the second lens G2, the third lens G3, the fourth lens G4, and the fifth lens G5 are all spherical mirrors.

[0029] Furthermore, in the high-definition lens, the first lens G1 has a biconcave structure, and the fourth lens G4 has a meniscus structure.

[0030] Alternatively, the first lens G1 may have a meniscus structure, and the fourth lens G4 may have a biconcave structure.

[0031] Alternatively, the first lens G1 may be a biconcave structure, and the fourth lens G4 may be a biconcave structure.

[0032] Alternatively, the first lens G1 may have a meniscus structure, and the fourth lens G4 may have a meniscus structure.

[0033] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0034] The high-definition lens provided in this invention comprises optical elements arranged sequentially from the object plane to the image plane, including a first lens, a first cemented lens group, an aperture stop, a fourth lens, and a fifth lens. The optical power of each lens and the focal length relationship between the lens and the first cemented lens group are rationally configured. This results in a lens that is not only compact and economical but also ensures high imaging resolution, a small aperture, and low distortion, thus meeting the needs of industrial applications and possessing significant market potential and economic value. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the structure of a high-definition lens provided in an embodiment of the present invention;

[0037] Figure 2 This is an optical distortion curve diagram of a high-definition lens provided in an embodiment of the present invention;

[0038] Figure 3 This is a relative illumination curve diagram of a high-definition lens provided in an embodiment of the present invention;

[0039] Figure 4 This is another structural schematic diagram of a high-definition lens provided in an embodiment of the present invention;

[0040] Figure 5 This is another structural schematic diagram of a high-definition lens provided in an embodiment of the present invention;

[0041] Figure 6 This is another structural schematic diagram of a high-definition lens provided in an embodiment of the present invention. Detailed Implementation

[0042] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0043] In the description of this invention, it should be understood that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component present simultaneously. When a component is considered to be "set" on another component, it can be directly set on the other component or there may be an intermediate component present simultaneously.

[0044] Furthermore, terms such as “long,” “short,” “inner,” and “outer” indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings. They are used only for the purpose of describing the present invention and are not intended to indicate or imply that the device or component referred to must have this specific orientation or operate in a specific orientational configuration. Therefore, they should not be construed as limitations of the present invention.

[0045] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0046] Example 1

[0047] In view of the aforementioned shortcomings of existing compact optical lenses, the applicant, based on years of extensive practical experience and professional knowledge in the design and manufacture of such products, and in conjunction with the application of theoretical principles, has actively conducted research and innovation in order to create a technology that can overcome the shortcomings of the prior art, making compact optical lenses more practical. After continuous research, design, and repeated prototype production and improvements, this invention, which has real practical value, has finally been created.

[0048] Please refer to Figure 1 This invention provides a high-definition lens, comprising a first lens G1, a first cemented lens group U1, an aperture S, a fourth lens G4, and a fifth lens G5 arranged sequentially from the object plane to the image plane; wherein,

[0049] The first lens G1 and the fourth lens G4 have negative optical power;

[0050] The first cemented lens group U1 and the fifth lens G5 have positive optical power, and the fifth lens G5 has a biconvex structure;

[0051] The focal length of the lens is f, and the focal length of the first cemented lens group U1 is f. U1 The f U1 The following relationship is satisfied with f:

[0052] 0.35<|f U1 / f|<0.90.

[0053] It should be noted that the above structure enables a high-definition lens with a focal length of 12mm, an image-side F-number of 5.6, a maximum imaging surface of φ9.5mm, and a resolution of 155lp / mm. This corresponds to a maximum imaging chip with four megapixels. The lens's maximum optical distortion across the entire field of view is less than 1.8%, specifically as follows... Figure 2 As shown, Figure 2 This is the optical distortion curve of the lens. The relative illumination of this lens reaches over 84%, specifically as follows: Figure 3 As shown, Figure 3 This is the relative illumination curve of the lens.

[0054] Please refer to this again. Figure 1 In this embodiment, the first cemented lens group U1 includes a second lens G2 and a third lens G3;

[0055] The second lens G2 has negative optical power and is a meniscus structure;

[0056] The third lens G3 has positive optical power and is a biconvex structure.

[0057] Preferably, the distance L from the vertex of the front surface of the first lens G1 to the vertex of the rear surface of the fifth lens G5 satisfies the following relationship with f:

[0058] |L / f|>1.70.

[0059] Preferably, the optical back intercept BFL from the vertex of the rear surface of the fifth lens G5 to the image plane satisfies the following relationship with f:

[0060] |BFL / f| < 1.10.

[0061] Preferably, the half-image height y' of the lens and f satisfy the following relationship:

[0062] |y' / f|<0.45.

[0063] Preferably, the focal length of the first lens G1 is f. G1 The f G1 The following relationship is satisfied with f:

[0064] 0.50 < |f G1 / f|<1.00.

[0065] Preferably, the focal length of the fourth lens G4 is f. G4 The f G4 The following relationship is satisfied with f:

[0066] 0.60 < |f G4 / f|<1.30.

[0067] Preferably, the focal length of the fifth lens G5 is f. G5 Its focal length f G5 The following relationship is satisfied with f:

[0068] 0.65 < |f G5 / f|<1.10.

[0069] Preferably, the first lens G1, the second lens G2, the third lens G3, the fourth lens G4, and the fifth lens G5 are all spherical mirrors.

[0070] In this embodiment, the specific structures of the first lens G1 and the fourth lens G4 can be combined in different ways. Each combination will be described in detail below:

[0071] In the first implementation, such as Figure 1 As shown, the first lens G1 has a biconcave structure, and the fourth lens G4 has a meniscus structure.

[0072] For example, the specific data of each optical element in the lens can be shown in Table 1 below:

[0073] Table 1:

[0074]

[0075] In this embodiment, the focal length of the lens, i.e., f, is 12mm, and the maximum aperture is F#=5.6. The focal length f of the first lens G1 is... G1 =-9.03mm, the focal length f of the first cemented lens U1 U1 =8.32mm, the focal length f of the fourth lens G4 G4 =-14.86mm, the focal length f of the fifth lens G5 G5 =12.93mm, the distance L from the vertex of the front surface of the first lens G1 to the vertex of the rear surface of the fifth lens G5 is 26.99mm, the optical back cutoff BFL is 7.08mm, and the half-image height y' is 4.75mm.

[0076] The specific relational expressions are: |f U1 / f|=0.69; |L / f|=2.25; |BFL / f|=0.59; |y' / f|=0.4; |f G1 / f|=0.75;|f G4 / f|=1.24;|f G5 / f|=1.08.

[0077] As can be seen, the above results satisfy the following relationship: 0.35 < |f U1 / f|<0.90; |L / f|>1.70; |BFL / f|<1.10; |y' / f|<0.45; 0.50<|f G1 / f| < 1.00; 0.60 < |f G4 / f| < 1.30; 0.65 < |f G5 / f|<1.10.

[0078] In the second implementation, such as Figure 4 As shown, the first lens G1 has a meniscus structure, and the fourth lens G4 has a biconcave structure.

[0079] For example, the specific data of each optical element in the lens can be shown in Table 2 below:

[0080] Table 2:

[0081]

[0082] In this embodiment, the focal length of the lens, i.e., f, is 12mm, and the maximum aperture is F#=5.6. The focal length f of the first lens G1 is... G1 =-10.76mm, the focal length f of the first cemented lens U1 U1 =8.74mm, the focal length f of the fourth lens G4 G4 =-7.80mm, the focal length f of the fifth lens G5 G5 =8.57mm, the distance L from the vertex of the front surface of the first lens G1 to the vertex of the rear surface of the fifth lens G5 is 23.8mm, the optical back cutoff BFL is 12.50mm, and the half-image height y' is 4.75mm.

[0083] The specific relational expressions are: |f U1 / f|=0.73; |L / f|=1.98; |BFL / f|=1.04; |y' / f|=0.4; |f G1 / f|=0.90;|f G4 / f|=0.65;|f G5 / f|=0.71.

[0084] As can be seen, the above results satisfy the following relationship: 0.35 < |f U1 / f|<0.90; |L / f|>1.70; |BFL / f|<1.10; |y' / f|<0.45; 0.50<|f G1 / f| < 1.00; 0.60 < |f G4 / f| < 1.30; 0.65 < |f G5 / f|<1.10.

[0085] In the third implementation, such as Figure 5 As shown, the first lens G1 has a biconcave structure, and the fourth lens G4 has a biconcave structure.

[0086] For example, the specific data of each optical element in the lens can be shown in Table 3 below:

[0087] Table 3:

[0088]

[0089] In this embodiment, the focal length of the lens, i.e., f, is 12mm, and the maximum aperture is F#=5.6. The focal length f of the first lens G1 is... G1 =-9.75mm, the focal length f of the first cemented lens U1 U1 =8.67mm, the focal length f of the fourth lens G4 G4 =-7.76mm, the focal length f of the fifth lens G5 G5 =8.38mm, the distance L from the vertex of the front surface of the first lens G1 to the vertex of the rear surface of the fifth lens G5 is 23.50mm, the optical back cutoff BFL is 12.70mm, and the half-image height y' is 4.75mm.

[0090] The specific relational expressions are: |f U1 / f|=0.72; |L / f|=1.96; |BFL / f|=1.06; |y' / f|=0.4; |f G1 / f|=0.81;|f G4 / f|=0.65;|f G5 / f|=0.70.

[0091] As can be seen, the above results satisfy the following relationship: 0.35 < |f U1 / f|<0.90; |L / f|>1.70; |BFL / f|<1.10; |y' / f|<0.45; 0.50<|f G1 / f| < 1.00; 0.60 < |f G4 / f| < 1.30; 0.65 < |f G5 / f|<1.10.

[0092] In the fourth embodiment, such as Figure 6 As shown, the first lens G1 has a meniscus structure, and the fourth lens G4 has a meniscus structure.

[0093] For example, the specific data of each optical element in the lens can be shown in Table 4 below:

[0094] Table 4:

[0095]

[0096] In this embodiment, the focal length of the lens, i.e., f, is 12mm, and the maximum aperture is F#=5.6. The focal length f of the first lens G1 is... G1 =-10.15mm, the focal length f of the first cemented lens U1 U1 =8.55mm, the focal length f of the fourth lens G4 G4 =-12.98mm, the focal length f of the fifth lens G5 G5 =11.97mm, the distance L from the vertex of the front surface of the first lens G1 to the vertex of the rear surface of the fifth lens G5 is 26.60mm, the optical back cutoff BFL is 9.70mm, and the half-image height y' is 4.75mm.

[0097] The specific relational expressions are: |f U1 / f|=0.71; |L / f|=2.22; |BFL / f|=0.81; |y' / f|=0.4; |f G1 / f|=0.85;|f G4 / f|=1.08;|f G5 / f|=1.00.

[0098] As can be seen, the above results satisfy the following relationship: 0.35 < |f U1 / f|<0.90; |L / f|>1.70; |BFL / f|<1.10; |y' / f|<0.45; 0.50<|f G1 / f| < 1.00; 0.60 < |f G4 / f| < 1.30; 0.65 < |f G5 / f|<1.10.

[0099] Although the terms first lens, first cemented lens group, aperture stop, fourth lens, and fifth lens are frequently used herein, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention.

[0100] The high-definition lens provided in this invention comprises optical elements arranged sequentially from the object plane to the image plane, including a first lens, a first cemented lens group, an aperture stop, a fourth lens, and a fifth lens. The optical power of each lens and the focal length relationship between the lens and the first cemented lens group are rationally configured. This results in a lens that is not only compact and economical but also ensures high imaging resolution, a small aperture, and low distortion, thus meeting the needs of industrial applications and possessing significant market potential and economic value.

[0101] In summary, after reading this detailed disclosure, those skilled in the art will understand that the foregoing detailed disclosure is presented by way of example only and is not restrictive. Although not explicitly stated herein, those skilled in the art will understand that this application is intended to encompass various reasonable changes, improvements, and modifications to the embodiments. These changes, improvements, and modifications are intended to be made by this application and are within the spirit and scope of the exemplary embodiments of this application.

[0102] Furthermore, certain terms used in this application have been used to describe embodiments of this application. For example, "an embodiment," "an embodiment," and / or "some embodiments" mean that a particular feature, structure, or characteristic described in connection with that embodiment may be included in at least one embodiment of this application. Therefore, it is to be emphasized and understood that two or more references to "an embodiment" or "an embodiment" or "an alternative embodiment" in various parts of this specification do not necessarily refer to the same embodiment. Moreover, specific features, structures, or characteristics may be appropriately combined in one or more embodiments of this application.

[0103] It should be understood that in the foregoing description of the embodiments of this application, various features are combined in a single embodiment, drawing, or description for the purpose of simplifying the understanding of a feature. However, this does not mean that the combination of these features is necessary, and those skilled in the art may extract some features as separate embodiments when reading this application. That is, the embodiments in this application can also be understood as an integration of multiple sub-embodiments. It is also valid when the content of each sub-embodiment contains fewer than all the features of a single foregoing disclosed embodiment.

[0104] Each patent, patent application, publication of the patent application, and other materials such as articles, books, specifications, publications, documents, articles, etc., cited herein may be incorporated by reference. The entire contents used for all purposes, except for any history of prosecution documents associated with it, that may be inconsistent with or conflict with this document, or that may have a limiting effect on the widest extent of the claims, are now or hereafter associated with this document. For example, in the event of any inconsistency or conflict between the description, definition, and / or use of terms associated with any of the included materials and the terms, description, definition, and / or used in connection with this document, the terms used herein shall prevail.

[0105] Finally, it should be understood that the embodiments disclosed herein are illustrative of the principles of the embodiments of this application. Other modified embodiments are also within the scope of this application. Therefore, the embodiments disclosed herein are merely examples and not limitations. Those skilled in the art can adopt alternative configurations to implement the applications in this application based on the embodiments in this application. Therefore, the embodiments of this application are not limited to the embodiments precisely described in the application.

Claims

1. A high-definition lens, characterized in that, It includes a first lens (G1), a first cemented lens group (U1), an aperture stop (S), a fourth lens (G4), and a fifth lens (G5) arranged sequentially from the object plane to the image plane; wherein, The first lens (G1) and the fourth lens (G4) have negative optical power; The first cemented lens group (U1) and the fifth lens (G5) have positive optical power, and the fifth lens (G5) has a biconvex structure; The focal length of the lens is f, and the focal length of the first cemented lens group (U1) is f. U1 The f U1 The following relationship is satisfied with f: 0.35<|f U1 / f|<0.90; The focal length of the first lens (G1) is f. G1 The f G1 The following relationship is satisfied with f: 0.50<|f G1 / f|<1.00。 2. The high-definition lens according to claim 1, characterized in that, The first cemented lens group (U1) includes a second lens (G2) and a third lens (G3); The second lens (G2) has negative optical power and is a meniscus structure; The third lens (G3) has positive optical power and is a biconvex structure.

3. The high-definition lens according to claim 2, characterized in that, The distance L from the vertex of the front surface of the first lens (G1) to the vertex of the rear surface of the fifth lens (G5) satisfies the following relationship with f: |L / f|>1.

70.

4. The high-definition lens according to claim 3, characterized in that, The optical back intercept BFL from the vertex of the rear surface of the fifth lens (G5) to the image plane satisfies the following relationship with f: |BFL / f| < 1.

10.

5. The high-definition lens according to claim 4, characterized in that, The half-image height y' of the lens and f satisfy the following relationship: |y' / f|<0.

45.

6. The high-definition lens according to claim 5, characterized in that, The focal length of the fourth lens (G4) is f G4 The f G4 The following relationship is satisfied with f: 0.60<|f G4 / f|<1.30。 7. The high-definition lens according to claim 6, characterized in that, The focal length of the fifth lens (G5) is f G5 Its focal length f G5 The following relationship is satisfied with f: 0.65<|f G5 / f|<1.10。 8. The high-definition lens according to claim 7, characterized in that, The first lens (G1), the second lens (G2), the third lens (G3), the fourth lens (G4), and the fifth lens (G5) are all spherical mirrors.

9. The high-definition lens according to claim 8, characterized in that, The first lens (G1) has a biconcave structure, and the fourth lens (G4) has a meniscus structure; Alternatively, the first lens (G1) has a meniscus structure, and the fourth lens (G4) has a biconcave structure; Alternatively, the first lens (G1) has a biconcave structure, and the fourth lens (G4) has a biconcave structure; Alternatively, the first lens (G1) has a meniscus structure, and the fourth lens (G4) has a meniscus structure.

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