High-resolution anti-seismic lens and optical system thereof

Abstract

The invention relates to the technical field of machine vision lenses, and discloses a high-resolution anti-seismic lens and an optical system thereof. The optical system comprises a front group S1 with negative focal power, a middle group S2 with positive focal power, a diaphragm A0 and a rear group S3 with positive focal power, wherein the front group S1, the middle group S2, the diaphragm A0 and the rear group S3 are sequentially arranged from an object side to an image side; the positions of the front group S1, the middle group S2, the diaphragm 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 meet the following relational expressions: 1.10 lt; fS1 / flt; 2.00, 1.10 lt, 2.00, 1.10 lt; fS2 / flt; 2.00, 1.00 lt, 1.00 lt; fS3 / flt; and 1.60. According to the optical system adopting the whole-set focusing mode, a high-resolution anti-seismic lens with the focal length of 12 mm is achieved, the resolution is high, the highest resolution can reach 185 lp / mm, distortion is low, and the good chromatic aberration correction capacity is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of machine vision lenses, and in particular to a high-resolution anti-vibration lens and an optical system thereof. Background Art

[0002] With the popularization of anti-vibration design concepts, the market demand for anti-vibration lenses continues to grow, and their application in various fields is constantly deepening.

[0003] However, the existing anti-vibration lenses have varying degrees of deficiencies in terms of resolution and distortion, and the specification distribution is incomplete, so the research and development of high-resolution anti-vibration lenses is urgent.

[0004] The above information is presented as background information only to assist with understanding the present disclosure and no determination or admission is made as to whether any of the above may be used as prior art with respect to the present disclosure. Summary of the invention

[0005] The object of the present invention is to provide a high-resolution anti-vibration lens and an optical system thereof, so as to solve or at least partially solve the technical problems existing in the prior art.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides an optical system of a high-resolution anti-vibration 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, which are arranged in sequence 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 to each other;

[0008] The focal length f of the optical system and the focal length f of the front group S1 S1 , focal length f of middle group S2 S2 And the focal length f of the rear group S3 S3 The following relationship is 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 respectively composed of a plurality of spherical lenses, and the optical axes of all the spherical lenses coincide with the predetermined optical axis.

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

[0014] The middle group S2 includes a first biconvex lens G3 with positive focal power and a third meniscus lens G4 with negative focal power, which are arranged in sequence from the object side to the image side; the first biconvex lens G3 and the third meniscus lens G4 are glued together to form a first glued lens group U1 with positive focal power;

[0015] The rear group S3 includes a first biconcave lens G5 with negative optical focal power, a second biconvex lens G6 with positive optical focal power, a second biconcave lens G7 with negative optical focal power, a third biconvex lens G8 with positive optical focal power and a fourth meniscus lens G9 with positive optical focal power, which are arranged in sequence from the object side to the image side; wherein the first biconcave lens G5 and the second biconvex lens G6 are cemented into a second cemented lens group U2 with positive optical focal power; the third biconvex lens G8 and the fourth meniscus lens G9 are cemented into a third cemented lens group U3 with negative optical focal power.

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

[0017] |L / f|>2.80;

[0018] Among them, the front surface of the first meniscus lens G1 is the side surface of the first meniscus lens G1 away from the second meniscus lens G2, and the back surface of the fourth meniscus lens G9 is the side surface of the fourth meniscus lens G9 away from the third biconvex lens G8; the front surface vertex of the first meniscus lens G1 and the back surface vertex 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 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 relationship:

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

[0023] Optionally, the focal length of the first meniscus lens G1 is f G1 , satisfying the relationship:

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

[0025] The focal length of the second lens G2 is fG2, which satisfies the relationship:

[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 satisfies the 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 satisfies the relationship:

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

[0031] The focal length of the fourth meniscus lens G9 is f G9 , f G9 The ratio of the focal length f of the optical system satisfies the 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 performed by changing the optical back focal length BFL of the optical system, thereby ensuring structural stability and achieving shock resistance.

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

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

[0036] In a second aspect, the present invention provides a high-resolution anti-vibration lens, comprising a focusing structure and an optical system of a high-resolution anti-vibration 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 as a whole to approach or move away from the image plane along a predetermined optical axis to achieve focusing.

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

[0039] The optical system provided by the present invention adopts a whole-group focusing method, realizes a high-resolution anti-vibration lens with a focal length of 12mm, has a high resolution, which can reach up to 185lp / mm, and has 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 described in detail in the accompanying drawings and the following detailed description incorporated herein, which together serve to explain the specific principles of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 The diagram is a schematic structural diagram of an optical system of a high-resolution anti-vibration lens provided by an embodiment of the present invention.

[0043] Figure 2 This is an optical distortion curve of an optical system of a high-resolution anti-vibration lens provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0044] In order to explain in detail the possible application scenarios, technical principles, specific schemes that can be implemented, and the purposes and effects that can be achieved, the following is a detailed description of the specific embodiments listed in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0045] Reference to "embodiment" herein means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or association with other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the various technical features mentioned in the embodiments can be combined in any way to form a corresponding implementable technical solution.

[0046] Unless otherwise defined, the technical terms used in this document have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms in this document is only for describing specific embodiments and is not intended to limit this application.

[0047] In the description of this application, the term "and / or" is an expression used to describe the logical relationship between objects, indicating that three relationships may exist, for example, A and / or B, which means: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this article generally indicates that the objects before and after are in an "or" logical relationship.

[0048] In the present application, terms such as “first” and “second” are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship of quantity, priority or sequence between these entities or operations.

[0049] Without further limitations, in this application, the words "include", "comprises", "has" or other similar expressions used in the sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those limited elements, but also other elements not explicitly listed, or also include elements inherent to such process, method or product.

[0050] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than", "less than", "exceed" and the like are understood to exclude the number itself; expressions such as "above", "below", "within" and the like are understood to include the number itself. In addition, in the description of the embodiments of this application, "multiple" means more than two (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups", "multiple times", etc., unless otherwise clearly and specifically limited.

[0051] In the description of the embodiments of the present application, space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present application or facilitating the reader's understanding, and do not indicate or imply that the referred device or component must have a specific position, a specific orientation, or be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0052] Unless otherwise expressly specified or limited, in the description of the embodiments of the present application, the terms such as "install", "connect", "connect", "fix", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For technicians in the technical field to which the present application belongs, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0053] Embodiment 1:

[0054] See also Figure 1 , Figure 1 The diagram is a schematic structural diagram of an optical system of a high-resolution anti-vibration lens provided by an embodiment of the present invention.

[0055] like Figure 1 As shown, the optical system of the high-resolution anti-vibration lens includes 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, which are arranged in sequence 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 to each other; in this embodiment, when the object distance changes, all the spherical lenses move together as a whole, and focusing is performed by changing the optical back focal length BFL of the optical system;

[0056] Specifically, the focal length of the optical system is f, the focal length of the front group S1 is fS1, and the focal length of the middle group S2 is f S2 And the focal length f of the rear group S3 S3 The following relationship is 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 respectively composed of a plurality of spherical lenses, and the optical axes of all the spherical lenses coincide with the predetermined optical axis.

[0061] Exemplarily, 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, which are arranged in sequence from the object side to the image side;

[0062] The middle group S2 includes a first biconvex lens G3 with positive focal power and a third meniscus lens G4 with negative focal power, which are arranged in sequence from the object side to the image side; the first biconvex lens G3 and the third meniscus lens G4 are glued together to form a first glued lens group U1 with positive focal power;

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

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

[0065] |L / f|>2.80;

[0066] Among them, the front surface of the first meniscus lens G1 is the side surface of the first meniscus lens G1 away from the second meniscus lens G2, and the back surface of the fourth meniscus lens G9 is the side surface of the fourth meniscus lens G9 away from the third biconvex lens G8; the front surface vertex of the first meniscus lens G1 and the back surface vertex of the fourth meniscus lens G9 are both on the predetermined optical axis.

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

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

[0071] More specifically, the focal length of the first meniscus lens G1 is f G1 , satisfying the relationship:

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

[0073] The focal length of the second lens G2 is f G2 , satisfying the relationship:

[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 satisfies the 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 satisfies the relationship:

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

[0079] The focal length of the fourth meniscus lens G9 is f G9 , f G9 The ratio of the focal length f of the optical system satisfies the 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 performed by changing the optical back focal length BFL of the optical system, thereby ensuring structural stability and achieving shock resistance.

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

[0083] The aperture value of the aperture A0 is F2.8 to F16. It is understandable that the aperture of the aperture can be adjusted according to specific application scenarios.

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

[0085] Table 1

[0086]

[0087]

[0088] It should be noted that in Table 1, the “front surface” corresponds to Figure 1 The left side surface of the lens or lens group corresponds to the "back surface" Figure 1 The corresponding lens or lens group on the right side surface; or can be understood as: the object side is Figure 1 On the left, the image is Figure 1 On the right side, the surface close to the object side is the "front surface", and the surface close to the image side is the "back surface".

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

[0090] Substituting the above values ​​into the above equations, we can get:

[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] Satisfies the relationship:

[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] See also Figure 2 , Figure 2 is an optical distortion curve of an optical system of a high-resolution anti-vibration lens provided by an embodiment of the present invention;

[0101] like Figure 2 As shown, the maximum optical distortion in the full field of view is less than 0.32%; therefore, the optical system of a high-resolution line scan industrial lens with a focal length of 12mm is realized through the above structure, the image side F number is 2.8, the maximum imaging surface is φ11mm, and its resolution can reach 185lp / mm, that is, when the corresponding maximum imaging chip is used, it can reach 7.9 million pixels, and the maximum optical distortion in the full field of view is less than 0.32%;

[0102] Moreover, by adopting the whole-group focusing method, its aperture can be flexibly adjusted according to different needs.

[0103] Embodiment 2:

[0104] This embodiment provides a high-resolution anti-vibration lens, including a focusing structure and an optical system of a high-resolution anti-vibration lens as in the first embodiment;

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

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

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

[0108] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An optical system of a high-resolution anti-vibration lens, characterized in that: It includes 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, which are arranged in sequence 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 to each other; The focal length f of the optical system and the focal length f of the front group S1 S1 , focal length f of middle group S2 S2 And the focal length f of the rear group S3 S3 The following relationship is 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 of a high-resolution anti-vibration lens according to claim 1, characterized in that: The front group S1, the middle group S2 and the rear group S3 are respectively composed of a plurality of spherical lenses, and the optical axes of all the spherical lenses coincide with the predetermined optical axis.

3. The optical system of a high-resolution anti-vibration lens according to claim 2, characterized in that: The front group S1 includes a first meniscus lens G1 with negative optical power and a second meniscus lens G2 with negative optical power, which are arranged in sequence from the object side to the image side; The middle group S2 includes a first biconvex lens G3 with positive focal power and a third meniscus lens G4 with negative focal power, which are arranged in sequence from the object side to the image side; the first biconvex lens G3 and the third meniscus lens G4 are glued together to form a first glued lens group U1 with positive focal power; The rear group S3 includes a first biconcave lens G5 with negative optical focal power, a second biconvex lens G6 with positive optical focal power, a second biconcave lens G7 with negative optical focal power, a third biconvex lens G8 with positive optical focal power and a fourth meniscus lens G9 with positive optical focal power, which are arranged in sequence from the object side to the image side; wherein the first biconcave lens G5 and the second biconvex lens G6 are cemented into a second cemented lens group U2 with positive optical focal power; the third biconvex lens G8 and the fourth meniscus lens G9 are cemented into a third cemented lens group U3 with negative optical focal power.

4. The optical system of a high-resolution anti-vibration lens according to claim 3, characterized in that: The distance L between the front surface vertex of the first meniscus lens G1 and the back surface vertex of the fourth meniscus lens G9 and the focal length f of the optical system satisfy the relationship: |L / f|>2.80; Among them, the front surface of the first meniscus lens G1 is the side surface of the first meniscus lens G1 away from the second meniscus lens G2, and the back surface of the fourth meniscus lens G9 is the side surface of the fourth meniscus lens G9 away from the third biconvex lens G8; the front surface vertex of the first meniscus lens G1 and the back surface vertex of the fourth meniscus lens G9 are both on the predetermined optical axis.

5. The optical system of a high-resolution anti-vibration lens according to claim 3, characterized in that: The optical back focal length BFL of the optical system and the focal length f of the optical system satisfy the 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 relationship: |y' / f|<0.

70.

6. The optical system of a high-resolution anti-vibration lens according to claim 3, characterized in that: The focal length of the first meniscus lens G1 is f G1 , satisfying the relationship: 3.20<|f G1 / f|<5.50; The focal length of the second lens G2 is fG2, which satisfies the relationship: 1.80<|f G2 / f|<3.00。 7. The optical system of a high-resolution anti-vibration lens according to claim 3, 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 satisfies the 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 satisfies the relationship: 32.00<|f U3 / f|<90.00; The focal length of the fourth meniscus lens G9 is f G9 , f G9 The ratio of the focal length f of the optical system satisfies the relationship: 1.35<|f G9 / f|<2.80。 8. The optical system of a high-resolution anti-vibration lens according to claim 3, characterized in that: When the object distance changes, all the spherical lenses move together as a whole, and focusing is performed by changing the optical back focal length BFL of the optical system.

9. The optical system of a high-resolution anti-vibration lens according to claim 3, characterized in that: The aperture of the aperture A0 is a circular hole, and the center of the circular hole is on the predetermined optical axis; The aperture value of aperture A0 is F2.8 to F16.

10. A high-resolution anti-vibration lens, characterized in that: An optical system comprising a focusing structure and a high-resolution anti-vibration lens as claimed in any one of claims 1 to 9; The focusing structure is used to drive the front group S1, the middle group S2, the aperture A0 and the rear group S3 as a whole to approach or move away from the image plane along a predetermined optical axis to achieve focusing.

Images