High-resolution anti-shake lens and optical system thereof

Abstract

The application relates to the technical field of machine vision lenses, and discloses a high-resolution anti-vibration lens and an optical system thereof. The optical system comprises, arranged in sequence from an object side to an image side, a front group S1 with negative optical power, a middle group S2 with positive optical power, an aperture A0, and a rear group S3 with positive optical power, and the positions of the front group S1, the middle group S2, the aperture A0 and the rear group S3 are relatively fixed; the focal length f of the optical system, the focal length fS1 of the front group S1, the focal length fS2 of the middle group S2 and the focal length fS3 of the rear group S3 satisfy the following relationships: 1.10<|fS1 / f|<2.00, 1.10<|fS2 / f|<2.00 and 1.00<|fS3 / f|<1.60. The optical system provided by the application adopts an integral focusing mode, realizes a high-resolution anti-vibration lens with a focal length of 12 mm, has relatively high resolution, the highest resolution being up to 185 lp / mm, has low distortion, and has good chromatic aberration correction capability.

Description

Technical Field

[0001] This invention relates to the field of machine vision lens technology, and more particularly to a high-resolution anti-vibration lens and its optical system. Background Technology

[0002] With the advent of Industry 4.0 and the promotion of intelligent manufacturing, a new category of industries with high requirements for vibration resistance has emerged, such as automated assembly, robotic arms, and high-speed reciprocating production lines. These industries demand that machine vision lenses possess excellent vibration resistance, requiring them to obtain clear, high-resolution images even in vibrating environments to improve production efficiency. Furthermore, with the increasing popularity of vibration-resistant design concepts, the market demand for vibration-resistant lenses continues to grow, leading to their deepening application across various fields.

[0003] However, existing anti-shake lenses generally have varying degrees of shortcomings in terms of resolution and distortion, and their specifications are not well-defined. Therefore, the development of high-resolution anti-shake lenses is urgently needed.

[0004] 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

[0005] The purpose of this invention is to provide a high-resolution anti-shake lens and its optical system to solve or at least partially solve the technical problems existing in the prior art.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides an optical system for a high-resolution anti-shake lens, comprising a front group S1 with negative optical power, a middle group S2 with positive optical power, an aperture A0 and a rear group S3 with positive optical power arranged sequentially from the object side to the image side, and the positions of the front group S1, the middle group S2, the aperture A0 and the rear group S3 are relatively fixed relative to each other.

[0008] The focal length f of the optical system and the focal length f of the front group S1 S1 The focal length f of the middle group S2 S2 And the focal length f of the rear group S3 S3 The following relationship must be satisfied:

[0009] 1.10<|f S1 / f|<2.00;

[0010] 1.10<|f S2 / f|<2.00;

[0011] 1.00<|f S3 / f|<1.60.

[0012] Optionally, the front group S1, the middle group S2, and the rear group S3 are each composed of several spherical lenses, and the optical axes of all the spherical lenses coincide with the predetermined optical axis.

[0013] Optionally, the front group S1 consists of a first meniscus lens G1 with negative optical power and a second meniscus lens G2 with negative optical power arranged sequentially from the object side to the image side.

[0014] The middle group S2 consists of a first biconvex lens G3 with positive optical power and a third meniscus lens G4 with negative optical power arranged sequentially from the object side to the image side; the first biconvex lens G3 and the third meniscus lens G4 are cemented together to form a first cemented lens group U1 with positive optical power.

[0015] The rear group S3 consists of a first biconcave lens G5 with negative optical power, a second biconvex lens G6 with positive optical power, a second biconcave lens G7 with negative optical power, a third biconvex lens G8 with positive optical power, and a fourth meniscus lens G9 with positive optical power, arranged sequentially from the object side to the image side; wherein, the first biconcave lens G5 and the second biconvex lens G6 are cemented together to form a second cemented lens group U2 with positive optical power; the third biconvex lens G8 and the fourth meniscus lens G9 are cemented together to form a third cemented lens group U3 with negative optical power.

[0016] Optionally, the distance L between the vertex of the front surface of the first meniscus lens G1 and the vertex of the rear surface of the fourth meniscus lens G9 satisfies the following relationship with the focal length f of the optical system:

[0017] |L / f|>2.80;

[0018] The front surface of the first meniscus lens G1 is the side surface of the first meniscus lens G1 that is opposite to the second meniscus lens G2, and the rear surface of the fourth meniscus lens G9 is the side surface of the fourth meniscus lens G9 that is opposite to the third biconvex lens G8; the apex of the front surface of the first meniscus lens G1 and the apex of the rear surface of the fourth meniscus lens G9 are both on the predetermined optical axis.

[0019] Optionally, the optical back focal length BFL of the optical system and the focal length f of the optical system satisfy the following relationship:

[0020] |BFL / f| < 1.35;

[0021] The half-image height y' of the optical system and the focal length f of the optical system satisfy the following relationship:

[0022] |y' / f|<0.70.

[0023] Optionally, the focal length of the first meniscus lens G1 is f. G1 The following relation is satisfied:

[0024] 3.20 < |f G1 / f|<5.50;

[0025] The focal length of the second meniscus lens G2 is f G2 The following relation is satisfied:

[0026] 1.80 < |f G2 / f|<3.00;

[0027] Optionally, the focal length of the second cemented lens group U2 is f. U2 f U2 The ratio of the focal length f of the optical system to the focal length f of the system satisfies the following relationship:

[0028] 90.00 < |f U2 / f|<180.00;

[0029] The focal length of the third cemented lens group U3 is f U3 f U3 The ratio of the focal length f of the optical system to the focal length f of the optical system satisfies the following relationship:

[0030] 32.00 < |f U3 / f|<90.00;

[0031] The focal length of the fourth crescent lens G9 is f. G9 f G9 The ratio of the focal length f of the optical system to the focal length f of the optical system satisfies the following relationship:

[0032] 1.35 < |f G9 / f|<2.80.

[0033] Optionally, when the object distance changes, all the spherical lenses move together as a whole, and focusing is achieved by changing the optical back focal length (BFL) of the optical system, thus ensuring structural stability and achieving shock resistance.

[0034] Optionally, the aperture of the stop A0 is a circular hole, and the center of the circular hole is on the predetermined optical axis;

[0035] The aperture value of stop A0 is F2.8 to F16.

[0036] In a second aspect, the present invention provides a high-resolution anti-shake lens, including a focusing structure and an optical system for a high-resolution anti-shake lens as described above;

[0037] The focusing structure is used to drive the front group S1, the middle group S2, the aperture A0 and the rear group S3 together along a predetermined optical axis to move closer to or further away from the image plane in order to achieve focusing.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] The optical system provided by this invention, which adopts a whole-group focusing method, realizes a high-resolution anti-shake lens with a focal length of 12mm, has high resolution, up to 185lp / mm, low distortion, and good chromatic aberration correction capability.

[0040] The present invention has other features and advantages, which will be apparent from or will be set forth in detail in the accompanying drawings and the following detailed description, which together serve to explain the particular principles of the invention. Attached Figure Description

[0041] 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.

[0042] Figure 1 This is a schematic diagram of the optical system of a high-resolution anti-shake lens provided in an embodiment of the present invention.

[0043] Figure 2 This is the optical distortion curve of an optical system for a high-resolution anti-shake lens provided in an embodiment of the present invention. Detailed Implementation

[0044] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.

[0045] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0046] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0047] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " in this document generally indicates that the preceding and following objects have an "or" logical relationship.

[0048] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy or order relationship between these entities or operations.

[0049] Unless otherwise specified, the use of terms such as “comprising,” “including,” “having,” or other similar expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0050] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments in this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.

[0051] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0052] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between two components. For those skilled in the art to which this application pertains, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0053] Example 1:

[0054] Please see Figure 1 , Figure 1 This is a schematic diagram of the optical system of a high-resolution anti-shake lens provided in an embodiment of the present invention.

[0055] like Figure 1 As shown, the optical system of the high-resolution anti-shake lens includes a front group S1 with negative optical power, a middle group S2 with positive optical power, an aperture stop A0, and a rear group S3 with positive optical power, arranged sequentially from the object side to the image side. The positions of the front group S1, the middle group S2, the aperture stop A0, and the rear group S3 are relatively fixed relative to each other. In this embodiment, when the object distance changes, all the spherical lenses move together as a whole, and focusing is achieved by changing the optical back focal length BFL of the optical system.

[0056] Specifically, the focal length f of the optical system, the focal length fS1 of the front group S1, and the focal length f of the middle group S2. S2 And the focal length f of the rear group S3 S3 The following relationship must be satisfied:

[0057] 1.10<|f S1 / f|<2.00;

[0058] 1.10<|f S2 / f|<2.00;

[0059] 1.00<|f S3 / f|<1.60.

[0060] More specifically, the front group S1, the middle group S2, and the rear group S3 are each composed of several spherical lenses, and the optical axes of all the spherical lenses coincide with the predetermined optical axis.

[0061] For example, as an optional implementation, the front group S1 includes a first meniscus lens G1 with negative optical power and a second meniscus lens G2 with negative optical power arranged sequentially from the object side to the image side.

[0062] The middle group S2 includes a first biconvex lens G3 with positive optical power and a third meniscus lens G4 with negative optical power arranged sequentially from the object side to the image side; the first biconvex lens G3 and the third meniscus lens G4 are cemented together to form a first cemented lens group U1 with positive optical power.

[0063] The rear group S3 includes, in order from the object side to the image side, a first biconcave lens G5 with negative optical power, a second biconvex lens G6 with positive optical power, a second biconcave lens G7 with negative optical power, a third biconvex lens G8 with positive optical power, and a fourth meniscus lens G9 with positive optical power; wherein, the first biconcave lens G5 and the second biconvex lens G6 are cemented together to form a second cemented lens group U2 with positive optical power; the third biconvex lens G8 and the fourth meniscus lens G9 are cemented together to form a third cemented lens group U3 with negative optical power.

[0064] Specifically, the distance L between the vertex of the front surface of the first meniscus lens G1 and the vertex of the rear surface of the fourth meniscus lens G9 satisfies the following relationship with the focal length f of the optical system:

[0065] |L / f|>2.80;

[0066] The front surface of the first meniscus lens G1 is the side surface of the first meniscus lens G1 that is opposite to the second meniscus lens G2, and the rear surface of the fourth meniscus lens G9 is the side surface of the fourth meniscus lens G9 that is opposite to the third biconvex lens G8; the vertex of the front surface of the first meniscus lens G1 and the vertex of the rear surface of the fourth meniscus lens G9 are both on the predetermined optical axis.

[0067] In this embodiment, the optical back focal length BFL and the focal length f of the optical system satisfy the following relationship:

[0068] |BFL / f| < 1.35;

[0069] The half-image height y' of the optical system and the focal length f of the optical system satisfy the following relationship:

[0070] |y' / f|<0.70.

[0071] More specifically, the focal length of the first meniscus lens G1 is f. G1 The following relation is satisfied:

[0072] 3.20 < |f G1 / f|<5.50;

[0073] The focal length of the second meniscus lens G2 is f G2 The following relation is satisfied:

[0074] 1.80 < |f G2 / f|<3.00;

[0075] The focal length of the second cemented lens group U2 is f U2 f U2 The ratio of the focal length f of the optical system to the focal length f of the optical system satisfies the following relationship:

[0076] 90.00 < |f U2 / f|<180.00;

[0077] The focal length of the third cemented lens group U3 is f U3 f U3 The ratio of the focal length f of the optical system to the focal length f of the optical system satisfies the following relationship:

[0078] 32.00 < |f U3 / f|<90.00;

[0079] The focal length of the fourth crescent lens G9 is f. G9 f G9 The ratio of the focal length f of the optical system to the focal length f of the optical system satisfies the following relationship:

[0080] 1.35 < |f G9 / f|<2.80.

[0081] Specifically, when the object distance changes, all the spherical lenses move together as a whole, and focusing is achieved by changing the optical back focal length (BFL) of the optical system, thus ensuring structural stability and achieving shock resistance.

[0082] In this embodiment, the aperture of the aperture stop A0 is set as a circular hole, and the center of the circular hole is on a predetermined optical axis;

[0083] The aperture value of stop A0 is F2.8 to F16. Understandably, the aperture of the stop can be adjusted according to the specific application scenario.

[0084] For example, in this instance, the optical system data is specifically shown in Table 1:

[0085] Table 1

[0086]

[0087]

[0088] It should be noted that in Table 1, "front surface" corresponds to... Figure 1 The left surface of the lens or lens group corresponds to the middle surface, while the rear surface corresponds to the left surface. Figure 1 The right side surface of the corresponding lens or lens group; or it can be understood as: the object surface in Figure 1 On the left, like a square Figure 1 On the right side, the surface closer to the object is called the "front surface", and the surface closer to the image is called the "back surface".

[0089] In this example, the focal length f of the optical system is 12mm, the aperture value of the stop A0 is F2.8, and the focal length f of the front group S1 is... S1 = -18.30mm, focal length f of the middle group S2 S2 =18.96mm, the focal length f of the rear group S3 S3 =15.90mm, the distance L from the vertex of the front surface of G1 to the vertex of the rear surface of G9 is 53.20mm, the optical back focal length BFL is 14.20mm, the half-image height y' is 5.5mm, and the focal length f of G1 is... G1 = -52.60mm, the focal length f of G2 G2 = -29.40mm, the focal length f of U2 U2 =1571.00mm, the focal length f of U3 U3 = -769.70mm, the focal length f of the G9 G9 =22.10mm;

[0090] Substituting the above values ​​into the above relationships, we can obtain:

[0091] |f S1 / f|=1.53;|f S2 / f|=1.58;|f S3 / f|=1.33;

[0092] |L / f|=4.43; |BFL / f|=1.18; |y' / f|=0.46; |f G1 / f|=4.38;

[0093] |f G2 / f|=2.45;|f U2 / f|=130.92;|f U3 / f|=64.14;|f G9 / f|=1.84.

[0094] Satisfying the relation:

[0095] 1.10<|f S1 / f|<2.00; 1.10<|f S2 / f|<2.00;1.00<|f S3 / f|<1.60;

[0096] |L / f|>2.80; |BFL / f|<1.35; |y' / f|<0.70;

[0097] 3.20 < |f G1 / f| < 5.50; 1.80 < |f G2 / f|<3.00;

[0098] 90.00 < |f U2 / f| < 180.00; 32.00 < |f U3 / f|<90.00;

[0099] 1.35 < |f G9 / f|<2.80.

[0100] Please see Figure 2 , Figure 2 This is the optical distortion curve of an optical system for a high-resolution anti-shake lens provided in an embodiment of the present invention;

[0101] like Figure 2 As shown, the maximum optical distortion across the entire field of view is less than 0.32%; therefore, the above structure realizes an optical system for a high-resolution line-scan industrial lens with a focal length of 12mm, an image-side F-number of 2.8, and a maximum imaging surface of [missing information]. Its resolution can reach 185 lp / mm, which corresponds to 7.9 million pixels when using the largest imaging chip, and the maximum optical distortion across the entire field of view is less than 0.32%.

[0102] Furthermore, by employing a whole-group focusing method, the aperture of the light can be flexibly adjusted according to different needs.

[0103] Example 2:

[0104] This embodiment provides a high-resolution anti-shake lens, including a focusing structure and an optical system as described in Embodiment 1;

[0105] The focusing structure is used to drive the front group S1, the middle group S2, the aperture A0 and the rear group S3 together along a predetermined optical axis to move closer to or further away from the image plane in order to achieve focusing.

[0106] Since the optical system has been described in detail in Embodiment 1, it will not be repeated in this embodiment.

[0107] In summary, this embodiment achieves a high-resolution anti-shake lens with a focal length of 12mm, which has high resolution, low distortion, and good chromatic aberration correction capability.

[0108] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An optical system for a high-resolution anti-shake lens, characterized in that, It consists of a front group S1 with negative optical power, a middle group S2 with positive optical power, an aperture A0 and a rear group S3 with positive optical power arranged sequentially from the object side to the image side, and the positions of the front group S1, the middle group S2, the aperture A0 and the rear group S3 are relatively fixed relative to each other. The front group S1 consists of a first meniscus lens G1 with negative optical power and a second meniscus lens G2 with negative optical power arranged sequentially from the object side to the image side; the front surfaces of the first meniscus lens G1 and the second meniscus lens G2 are convex. The middle group S2 consists of a first biconvex lens G3 with positive optical power and a third meniscus lens G4 with negative optical power arranged sequentially from the object side to the image side; the first biconvex lens G3 and the third meniscus lens G4 are cemented together to form a first cemented lens group U1 with positive optical power. The rear group S3 consists of a first biconcave lens G5 with negative optical power, a second biconvex lens G6 with positive optical power, a second biconcave lens G7 with negative optical power, a third biconvex lens G8 with positive optical power, and a fourth meniscus lens G9 with positive optical power, arranged sequentially from the object side to the image side. The first biconcave lens G5 and the second biconvex lens G6 are cemented together to form a second cemented lens group U2 with positive optical power; the third biconvex lens G7 and the fourth meniscus lens G8 are cemented together to form a third cemented lens group U3 with negative optical power; the front surface of the fourth meniscus lens G9 is convex. When the object distance changes, all the spherical lenses move together as a whole, and focusing is achieved by changing the optical back focal length (BFL) of the optical system. The focal length f of the optical system and the focal length f of the front group S1 S1 The focal length f of the middle group S2 S2 And the focal length f of the rear group S3 S3 The following relationship must be satisfied: 1.10<|f S1 / f|<2.00; 1.10<|f S2 / f|<2.00; 1.00<|f S3 / f|<1.60。 2. The optical system for a high-resolution anti-shake lens according to claim 1, characterized in that, The front group S1, the middle group S2, and the rear group S3 are each composed of several spherical lenses, and the optical axes of all the spherical lenses coincide with the predetermined optical axis.

3. The optical system for a high-resolution anti-shake lens according to claim 2, characterized in that, The distance L between the vertex of the front surface of the first meniscus lens G1 and the vertex of the rear surface of the fourth meniscus lens G9 satisfies the following relationship with the focal length f of the optical system: |L / f|>2.80; The front surface of the first meniscus lens G1 is the side surface of the first meniscus lens G1 that is opposite to the second meniscus lens G2, and the rear surface of the fourth meniscus lens G9 is the side surface of the fourth meniscus lens G9 that is opposite to the third biconvex lens G8; the apex of the front surface of the first meniscus lens G1 and the apex of the rear surface of the fourth meniscus lens G9 are both on the predetermined optical axis.

4. The optical system for a high-resolution anti-shake lens according to claim 1, characterized in that, The optical back focal length BFL of the optical system and the focal length f of the optical system satisfy the following relationship: |BFL / f| < 1.35; The half-image height y' of the optical system and the focal length f of the optical system satisfy the following relationship: |y' / f|<0.

70.

5. The optical system for a high-resolution anti-shake lens according to claim 1, characterized in that, The focal length of the first meniscus lens G1 is f G1 The following relation is satisfied: 3.20<|f G1 / f|<5.50; The focal length of the second meniscus lens G2 is f G2 The following relation is satisfied: 1.80<|f G2 / f|<3.00。 6. The optical system for a high-resolution anti-shake lens according to claim 1, characterized in that, The focal length of the second cemented lens group U2 is f U2 f U2 The ratio of the focal length f of the optical system to the focal length f of the system satisfies the following relationship: 90.00<|f U2 / f|<180.00; The focal length of the third cemented lens group U3 is f U3 f U3 The ratio of the focal length f of the optical system to the focal length f of the system satisfies the following relationship: 32.00<|f U3 / f|<90.00; The focal length of the fourth crescent lens G9 is f. G9 f G9 The ratio of the focal length f of the optical system to the focal length f of the system satisfies the following relationship: 1.35<|f G9 / f|<2.80。 7. The optical system for a high-resolution anti-shake lens according to claim 2, characterized in that, The aperture of the stop A0 is a circular hole, and the center of the circular hole is on the predetermined optical axis; The aperture value of stop A0 is F2.8 to F16.

8. A high-resolution anti-shake lens, characterized in that, Includes a focusing structure and an optical system for a high-resolution anti-shake lens as described in any one of claims 1-7; The focusing structure is used to drive the front group S1, the middle group S2, the aperture A0 and the rear group S3 together along a predetermined optical axis to move closer to or further away from the image plane in order to achieve focusing.

Images