High-resolution large-target-surface double telecentric lens and optical system thereof

Abstract

The invention relates to the technical field of machine vision lenses, and discloses a high-resolution large-target-surface double telecentric lens and an optical system thereof. The optical system comprises a front group S1, a diaphragm T and a rear group S2 which are sequentially arranged from an object side to an image side, the combined focal length of the front group S1 is fS1, the combined focal length of the rear group S2 is fS2, and fS1 and fS2 meet the relational expression of 0.8 lt; fS1 / fS2lt; the half-image height y'of the optical system and fS2 meet the relational expression: y ' / fS2lt, 0.4. Through the structural design of the optical system, the high-resolution large-target-surface double telecentric lens is realized, the maximum imaging surface can reach phi 62 mm and above, the full-field resolution can reach 130lp / mm, and the optical system has very low distortion and can be matched with an industrial camera with 1.5 billion pixels.

Description

Technical Field

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

[0002] In machine vision inspection systems, the use of ordinary industrial lenses will cause problems such as magnification changing with working distance, parallax, large distortion, etc., which make it difficult to meet high-precision inspection requirements. Telecentric lenses can improve or even eliminate the above problems. Within a certain object distance range, the image magnification will not change with the change of object distance. Its principle advantage makes it very suitable, especially in the field of precision vision inspection.

[0003] With the continuous development of the machine vision industry and the continuous improvement of camera sensor resolution, 150 million pixel industrial cameras have been launched on the market, but there are almost no telecentric lenses that can match such cameras. In view of this, the field is in urgent need of a telecentric lens with high resolution and large target surface that can be adapted to 150 million pixel industrial cameras to meet the new needs of industrial applications.

[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 large-target-area double-telecentric 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 large-target double telecentric lens, comprising a front group S1, a stop T, and a rear group S2 arranged in sequence from the object side to the image side; the combined focal length of the front group S1 is f S1 , the combined focal length of the rear group S2 is f S2 , f S1 With f S2 Satisfies the relationship: 0.8<|f S1 / f S2 |<1.5;

[0008] The front group S1 includes a first lens G1 with positive power, a second lens G2 with positive power, a third lens G3 with positive power, a fourth lens G4 with negative power, a fifth lens G5 with negative power, and a sixth lens G6 with positive power, which are arranged in sequence from the object side to the image side. The third lens G3 and the fourth lens G4 form a first cemented lens U1 with negative power, and the fifth lens G5 and the sixth lens G6 form a second cemented lens U2 with positive power.

[0009] The rear group S2 includes a seventh lens G7 with negative power, an eighth lens G8 with positive power, a ninth lens G9 with positive power, and a tenth lens G10 with positive power, which are arranged in sequence from the object side to the image side. The seventh lens G7 and the eighth lens G8 form a third cemented lens U3 with negative power. The half image height y' and f of the optical system are S2 Satisfies the relationship: |y' / f S2 |<0.4.

[0010] Optionally, the focal length of the first lens G1 is f 1 , f 1 With f S1 Satisfies the relationship: 1.6<|f 1 / f S1 |<2.4;

[0011] The focal length of the second lens G2 is f 2 , f 2 With f S1 Satisfies the relationship: 0.2<|f S1 / f 2 |<0.5.

[0012] Optionally, the focal length of the first cemented lens U1 is f U1 , the focal length of the second cemented lens U2 is f U2 ;

[0013] f U1 With f S1 Satisfies the relationship: 0.35<|f S1 / f U1 |<0.8;

[0014] f U2 With f S1 Satisfies the relationship: 0.4<|f S1 / f U2 |<1.3.

[0015] Optionally, the refractive index of the second lens G2 is n 2 , the Abbe number is v 2 , n 2 With v 2Respectively satisfy the relationship: 1.50 <n2<1.65,50<v2<65。

[0016] Optionally, the focal length of the third cemented lens U3 is f U3 , f U3 With f S2 Satisfies the relationship: 0.5<|f U3 / f S2 |<1.5;

[0017] The focal length of the ninth lens G9 is f 9 , f 9 With f S2 Satisfies the relationship: 1.25<|f 9 / f S2 |<2;

[0018] The focal length of the tenth lens G10 is f 10 , f 10 With f S2 Satisfies the relationship: 1.5<|f 10 / f S2 |<2.3.

[0019] Optionally, the refractive index of the ninth lens G9 is n 9 , the Abbe number is v 9 , n 9 With v 9 They satisfy the relationship: 1.48 <n 9 <1.63,60 <v 9 <82.

[0020] Optionally, in the front group S1, the first lens G1 is a biconvex lens, and the second lens G2, the fifth lens G5 and the sixth lens G6 are all meniscus lenses;

[0021] In the rear group S2, the seventh lens G7 is a biconcave lens, the eighth lens G8 and the tenth lens G10 are both biconvex lenses, and the ninth lens G9 is a meniscus lens.

[0022] Optionally, the optical axes of the first lens G1, the second lens G2, the third lens G3, the fourth lens G4, the fifth lens G5, the sixth lens G6, the seventh lens G7, the eighth lens G8, the ninth lens G9 and the tenth lens G10 are all on a predetermined optical axis;

[0023] The aperture of the diaphragm T is a circular hole, and the center of the circular hole is on the predetermined optical axis.

[0024] Optionally, the second cemented lens U2 is a new type of cemented lens, and its cemented surface is a converging surface for compensating for spherical aberration.

[0025] In a second aspect, the present invention provides a high-resolution large-target-area bi-telecentric lens, comprising an optical system of the high-resolution large-target-area bi-telecentric lens as described above.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] Through the structural design of the optical system, the present invention realizes a high-resolution large-target double-telecentric lens with a maximum imaging surface of Φ62mm or above, a full-field resolution of 130lp / mm, and very low distortion, which can match an industrial camera with 150 million pixels.

[0028] 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

[0029] 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.

[0030] Figure 1 It is a structural schematic diagram of an optical system of a high-resolution large-target-surface double-telecentric lens provided in Embodiment 1 of the present invention.

[0031] Figure 2 This is a light path diagram of an optical system of a high-resolution, large-target-area, double-telecentric lens provided in Embodiment 1 of the present invention.

[0032] Figure 3 This is an MTF curve diagram of the optical system of a high-resolution, large-target-area, double-telecentric lens provided in Example 1 of the present invention.

[0033] Figure 4 A schematic diagram of optical system distortion of a high-resolution, large-target-area, dual-telecentric lens provided in Embodiment 1 of the present invention.

[0034] Figure 5 A schematic diagram of the structure of an optical system of a high-resolution, large-target-surface, double-telecentric lens provided in Embodiment 2 of the present invention;

[0035] Figure 6 An MTF curve diagram of an optical system of a high-resolution, large-target-surface, double-telecentric lens provided in Embodiment 2 of the present invention;

[0036] Figure 7 A schematic diagram of the distortion of an optical system of a high-resolution, large-target-area, double-telecentric lens provided in Embodiment 2 of the present invention. DETAILED DESCRIPTION

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] Embodiment 1:

[0047] See also Figure 1 and Figure 2 , Figure 1 1 is a schematic diagram of the structure of an optical system of a high-resolution large-target double-telecentric lens provided in Embodiment 1 of the present invention. Figure 2 This is a light path diagram of an optical system of a high-resolution, large-target-area, double-telecentric lens provided in Embodiment 1 of the present invention.

[0048] like Figure 1 As shown, the optical system includes:

[0049] The front group S1, the aperture T and the rear group S2 are arranged in sequence from the object side to the image side; the combined focal length of the front group S1 is f S1 , the combined focal length of the rear group S2 is f S2 , fS1 With f S2 Satisfies the relationship: 0.8<|f S1 / f S2 |<1.5;

[0050] The front group S1 includes a first lens G1 with positive power, a second lens G2 with positive power, a third lens G3 with positive power, a fourth lens G4 with negative power, a fifth lens G5 with negative power, and a sixth lens G6 with positive power, which are arranged in sequence from the object side to the image side. The third lens G3 and the fourth lens G4 form a first cemented lens U1 with negative power, and the fifth lens G5 and the sixth lens G6 form a second cemented lens U2 with positive power.

[0051] The rear group S2 includes a seventh lens G7 with negative power, an eighth lens G8 with positive power, a ninth lens G9 with positive power, and a tenth lens G10 with positive power, which are arranged in sequence from the object side to the image side. The seventh lens G7 and the eighth lens G8 form a third cemented lens U3 with negative power. The half image height y' and f of the optical system are S2 Satisfies the relationship: |y' / f S2 |<0.4.

[0052] Furthermore, the focal length of the first lens G1 is f 1 , f 1 With f S1 Satisfies the relationship: 1.6<|f 1 / f S1 |<2.4;

[0053] The focal length of the second lens G2 is f 2 , f 2 With f S1 Satisfies the relationship: 0.2<|f S1 / f 2 |<0.5.

[0054] Furthermore, the focal length of the first cemented lens U1 is f U1 , the focal length of the second cemented lens U2 is f U2 ;

[0055] f U1 With f S1 Satisfies the relationship: 0.35<|f S1 / f U1 |<0.8;

[0056] f U2 With f S1 Satisfies the relationship: 0.4<|f S1 / f U2 |<1.3.

[0057] As a preferred implementation, the second cemented lens U2 is a new type of cemented lens, and its cemented surface is a converging surface for compensating for spherical aberration.

[0058] Furthermore, the focal length of the third cemented lens U3 is f U3 , f U3 With f S2 Satisfies the relationship: 0.5<|f U3 / f S2 |<1.5;

[0059] The focal length of the ninth lens G9 is f 9 , f 9 With f S2 Satisfies the relationship: 1.25<|f 9 / f S2 |<2;

[0060] The focal length of the tenth lens G10 is f 10 , f 10 With f S2 Satisfies the relationship: 1.5<|f 10 / f S2 |<2.3.

[0061] In this embodiment, the refractive index of the second lens G2 is n 2 , the Abbe number is v 2 , n 2 With v 2 Respectively satisfy the relationship: 1.50 <n2<1.65,50<v2<65;

[0062] The refractive index of the ninth lens G9 is n 9 , the Abbe number is v 9 , n 9 With v 9 They satisfy the relationship: 1.48 <n 9 <1.63,60 <v 9 <82.

[0063] In this embodiment, the first lens G1 and the second lens G2 have strong deflection and refraction power. Such a configuration is beneficial to reducing the total length of the lens optical system. Since the deflection and refraction power is shared by two lenses (i.e., the first lens G1 and the second lens G2), the incident angle of light entering the lens can be reduced, thereby reducing the formation of aberrations, providing a good basis for subsequent aberration correction.

[0064] The first cemented lens U1, the third cemented lens U3 and the low-dispersion ninth lens G9 can well balance the chromatic aberration of the optical system; the second cemented lens U2 is a new type of cemented lens, which, on the basis of achromatism, pays more attention to correcting field curvature, so it can balance the field curvature of the optical system in this embodiment, and its cemented surface is a converging surface with positive optical power, which can compensate for the spherical aberration caused by the negative lens; the cemented surface of the third cemented lens U3 is used to correct astigmatism.

[0065] More specifically, Figure 1 or Figure 2 As shown, in this embodiment, in the front group S1, the first lens G1 is a biconvex lens, and the second lens G2, the fifth lens G5 and the sixth lens G6 are all meniscus lenses;

[0066] In the rear group S2, the seventh lens G7 is a biconcave lens, the eighth lens G8 and the tenth lens G10 are both biconvex lenses, and the ninth lens G9 is a meniscus lens.

[0067] like Figure 1 , the optical axes of the first lens G1, the second lens G2, the third lens G3, the fourth lens G4, the fifth lens G5, the sixth lens G6, the seventh lens G7, the eighth lens G8, the ninth lens G9 and the tenth lens G10 are all on a predetermined optical axis;

[0068] The aperture of the diaphragm T is a circular hole, and the center of the circular hole is on the predetermined optical axis.

[0069] It is understandable that the aperture value of the aperture T needs to be adjusted accordingly according to the specific application scenario.

[0070] In order to verify whether the above optical system meets the design purpose, the following is a specific application example given according to the above settings of this embodiment:

[0071] In this application example, the lens data of the optical system are shown in Table 1 below:

[0072] Table 1

[0073]

[0074]

[0075] 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 side (or image plane) 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".

[0076] In this application example, the optical system half-image height y' = 31mm, and the combined focal length of the front group S1 is f S1 =106mm; the combined focal length of the rear group S2 is f S2 =105mm; the focal length of the first lens G1 is f 1 =191mm; the focal length of the second lens G2 is f 2 =476.5mm; focal length f of cemented lens group U1 U1 =-217mm; focal length f of cemented lens group U2 U2 =170mm; focal length f of cemented lens group U3 U3 =-118.7mm; the focal length of the ninth lens G9 is f 9 =147mm; the focal length f of the tenth lens G10 10 =186mm;

[0077] Please refer to Figure 3 and Figure 4 , Figure 3 The MTF (Modulation Transfer Function) curve of the optical system of a high-resolution large-target double-telecentric lens provided in the first embodiment of the present invention is as follows: Figure 4 A schematic diagram of the distortion of an optical system of a high-resolution, large-target-area, double-telecentric lens provided in Embodiment 1 of the present invention;

[0078] like Figure 3 and Figure 4 As shown, this embodiment realizes an optical system of a high-resolution large-target double telecentric lens, with a working distance of 134 mm, a magnification of 1, and a maximum imaging surface of The MTF value of the full field of view at 130lp / mm is >0.3, which can match a 150-megapixel industrial camera with a pixel size of 3.76 microns, and the optical distortion of the full field of view is less than 0.04%.

[0079] Embodiment 2:

[0080] See also Figure 5 , Figure 5 It is a schematic structural diagram of an optical system of a high-resolution, large-target-surface, double-telecentric lens provided in Embodiment 2 of the present invention.

[0081] like Figure 5 As shown, the optical system includes:

[0082] The front group S1, the aperture T and the rear group S2 are arranged in sequence from the object side to the image side; the combined focal length of the front group S1 is f S1 , the combined focal length of the rear group S2 is f S2 , f S1 With fS2 Satisfies the relationship: 0.8<|f S1 / f S2 |<1.5;

[0083] The front group S1 includes a first lens G1 with positive power, a second lens G2 with positive power, a third lens G3 with positive power, a fourth lens G4 with negative power, a fifth lens G5 with negative power, and a sixth lens G6 with positive power, which are arranged in sequence from the object side to the image side. The third lens G3 and the fourth lens G4 form a first cemented lens U1 with negative power, and the fifth lens G5 and the sixth lens G6 form a second cemented lens U2 with positive power.

[0084] The rear group S2 includes a seventh lens G7 with negative power, an eighth lens G8 with positive power, a ninth lens G9 with positive power, and a tenth lens G10 with positive power, which are arranged in sequence from the object side to the image side. The seventh lens G7 and the eighth lens G8 form a third cemented lens U3 with negative power. The half image height y' and f of the optical system are S2 Satisfies the relationship: |y' / f S2 |<0.4.

[0085] Furthermore, the focal length of the first lens G1 is f 1 , f 1 With f S1 Satisfies the relationship: 1.6<|f 1 / f S1 |<2.4;

[0086] The focal length of the second lens G2 is f 2 , f 2 With f S1 Satisfies the relationship: 0.2<|f S1 / f 2 |<0.5.

[0087] Furthermore, the focal length of the first cemented lens U1 is f U1 , the focal length of the second cemented lens U2 is f U2 ;

[0088] f U1 With f S1 Satisfies the relationship: 0.35<|f S1 / f U1 |<0.8;

[0089] f U2 With f S1 Satisfies the relationship: 0.4<|f S1 / f U2 |<1.3.

[0090] As a preferred implementation, the second cemented lens U2 is a new type of cemented lens, and its cemented surface is a converging surface for compensating for spherical aberration.

[0091] Furthermore, the focal length of the third cemented lens U3 is f U3 , f U3 With f S2 Satisfies the relationship: 0.5<|f U3 / f S2 |<1.5;

[0092] The focal length of the ninth lens G9 is f 9 , f 9 With f S2 Satisfies the relationship: 1.25<|f 9 / f S2 |<2;

[0093] The focal length of the tenth lens G10 is f 10 , f 10 With f S2 Satisfies the relationship: 1.5<|f 10 / f S2 |<2.3.

[0094] In this embodiment, the refractive index of the second lens G2 is n 2 , the Abbe number is v 2 , n 2 With v 2 Respectively satisfy the relationship: 1.50 <n2<1.65,50<v2<65;

[0095] The refractive index of the ninth lens G9 is n 9 , the Abbe number is v 9 , n 9 With v 9 They satisfy the relationship: 1.48 <n 9 <1.63,60 <v 9 <82.

[0096] In this embodiment, the first lens G1 and the second lens G2 have strong deflection and refraction power. Such a configuration is beneficial to reducing the total length of the lens optical system. Since the deflection and refraction power is shared by two lenses (i.e., the first lens G1 and the second lens G2), the incident angle of light entering the lens can be reduced, thereby reducing the formation of aberrations, providing a good basis for subsequent aberration correction.

[0097] The first cemented lens U1, the third cemented lens U3 and the low-dispersion ninth lens G9 can well balance the chromatic aberration of the optical system; the second cemented lens U2 is a new type of cemented lens, which, on the basis of achromatism, pays more attention to correcting field curvature, so it can balance the field curvature of the optical system in this embodiment, and its cemented surface is a converging surface with positive optical power, which can compensate for the spherical aberration caused by the negative lens; the cemented surface of the third cemented lens U3 is used to correct astigmatism.

[0098] More specifically, Figure 5 As shown, in this embodiment, in the front group S1, the first lens G1 is a biconvex lens, and the second lens G2, the fifth lens G5 and the sixth lens G6 are all meniscus lenses;

[0099] In the rear group S2, the seventh lens G7 is a biconcave lens, the eighth lens G8 and the tenth lens G10 are both biconvex lenses, and the ninth lens G9 is a meniscus lens.

[0100] like Figure 5 , the optical axes of the first lens G1, the second lens G2, the third lens G3, the fourth lens G4, the fifth lens G5, the sixth lens G6, the seventh lens G7, the eighth lens G8, the ninth lens G9 and the tenth lens G10 are all on a predetermined optical axis;

[0101] The aperture of the diaphragm T is a circular hole, and the center of the circular hole is on the predetermined optical axis.

[0102] It is understandable that the aperture value of the aperture T needs to be adjusted accordingly according to the specific application scenario.

[0103] In order to verify whether the above optical system meets the design purpose, the following is a specific application example given according to the above settings of this embodiment:

[0104] In this application example, the lens data of the optical system are shown in Table 2 below:

[0105] Table 2

[0106]

[0107]

[0108] It should be noted that in Table 2, the “front surface” corresponds to Figure 5 The left side surface of the lens or lens group corresponds to the "back surface" Figure 5 The corresponding lens or lens group on the right side surface; or can be understood as: the object side is Figure 5 On the left, the image side (or image plane) is Figure 5 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".

[0109] In this application example, the optical system half-image height y' = 33.5mm, and the combined focal length of the front group S1 is f S1＝ 127.6mm; the combined focal length of the rear group S2 is f S2 =102mm; the focal length of the first lens G1 is f 1 =225.5mm; the focal length of the second lens G2 is f 2 =551mm; focal length f of cemented lens group U1 U1 =-205mm; focal length f of cemented lens group U2 U2 =149mm; focal length f of cemented lens group U3 U3 =-148.6mm; the focal length of the ninth lens G9 is f 9 =157mm; the focal length f of the tenth lens G10 10 =186.3mm;

[0110] Please refer to Figure 6 and Figure 7 , Figure 6 This is an MTF curve diagram of an optical system of a high-resolution large-target double-telecentric lens provided in Example 1 of the present invention. Figure 7 A schematic diagram of the distortion of an optical system of a high-resolution, large-target-area, double-telecentric lens provided in Embodiment 1 of the present invention;

[0111] like Figure 6 and Figure 7 As shown, this embodiment realizes an optical system of a high-resolution large-target double telecentric lens, with a working distance of 147.6 mm, a magnification of 0.8 times, and a maximum imaging surface of The full-field MTF value reaches 130lp / mm, which can match a 150-megapixel industrial camera with a pixel size of 3.76 microns, and the full-field optical distortion is less than 0.02%.

[0112] Embodiment three:

[0113] This embodiment provides a high-resolution large-target-area bi-telecentric lens, including an optical system of a high-resolution large-target-area bi-telecentric lens as described in Embodiment 1 or Embodiment 2.

[0114] Since the optical system has been described in detail in the above embodiments, it will not be described in detail in this embodiment.

[0115] In summary, the embodiment of the present invention realizes a dual telecentric lens with a resolution of 130lp / mm and a field of view of Φ62mm or above. The full field of view distortion is very low and can be adapted to 150-megapixel industrial cameras, meeting the new requirements of industrial applications.

[0116] 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 high-resolution large-target double-telecentric lenses, characterized in that: It includes the front group S1, the diaphragm T and the rear group S2 arranged in sequence from the object side to the image side; the combined focal length of the front group S1 is f S1 , the combined focal length of the rear group S2 is f S2 , f S1 With f S2 Satisfies the relationship: 0.8<|f S1 / f S2 |<1.5; The front group S1 includes a first lens G1 with positive power, a second lens G2 with positive power, a third lens G3 with positive power, a fourth lens G4 with negative power, a fifth lens G5 with negative power, and a sixth lens G6 with positive power, which are arranged in sequence from the object side to the image side. The third lens G3 and the fourth lens G4 form a first cemented lens U1 with negative power, and the fifth lens G5 and the sixth lens G6 form a second cemented lens U2 with positive power. The rear group S2 includes a seventh lens G7 with negative power, an eighth lens G8 with positive power, a ninth lens G9 with positive power, and a tenth lens G10 with positive power, which are arranged in sequence from the object side to the image side. The seventh lens G7 and the eighth lens G8 form a third cemented lens U3 with negative power. The half image height y' and f of the optical system are S2 Satisfies the relationship: |y' / f S2 |<0.

4.

2. The optical system of a high-resolution large-target double-telecentric lens according to claim 1, characterized in that: The focal length of the first lens G1 is f1, and f1 and f S1 Satisfies the relationship: 1.6<|f1 / f S1 |<2.4; The focal length of the second lens G2 is f2, and f2 is equal to f S1 Satisfies the relationship: 0.2<|f S1 / f2|<0.

5.

3. The optical system of a high-resolution large-target-area double-telecentric lens according to claim 2, characterized in that: The focal length of the first cemented lens U1 is f U1 , the focal length of the second cemented lens U2 is f U2 ; f U1 With f S1 Satisfies the relationship: 0.35<|f S1 / f U1 |<0.8; f U2 With f S1 Satisfies the relationship: 0.4<|f S1 / f U2 |<1.

3.

4. The optical system of a high-resolution large-target double-telecentric lens according to claim 3, characterized in that: The refractive index of the second lens G2 is n2, and the Abbe number is v2. n2 and v2 satisfy the relationship: 1.50 <n2<1.65,50<v2<65。 5. The optical system of a high-resolution large-target double-telecentric lens according to claim 3, characterized in that: The focal length of the third cemented lens U3 is f U3 , f U3 With f S2 Satisfies the relationship: 0.5<|f U3 / f S2 |<1.5; The focal length of the ninth lens G9 is f9, and f9 is equal to f S2 Satisfies the relationship: 1.25<|f9 / f S2 |<2; The focal length of the tenth lens G10 is f 10 , f 10 With f S2 Satisfies the relationship: 1.5<|f 10 / f S2 |<2.

3.

6. The optical system of a high-resolution large-target-area double-telecentric lens according to claim 5, characterized in that: The refractive index of the ninth lens G9 is n9, and the Abbe number is v9. n9 and v9 respectively satisfy the relationship: 1.48 <n9<1.63,60<v9<82。 7. The optical system of a high-resolution large-target-area double-telecentric lens according to claim 5, characterized in that: In the front group S1, the first lens G1 is a biconvex lens, and the second lens G2, the fifth lens G5 and the sixth lens G6 are all meniscus lenses; In the rear group S2, the seventh lens G7 is a biconcave lens, the eighth lens G8 and the tenth lens G10 are both biconvex lenses, and the ninth lens G9 is a meniscus lens.

8. The optical system of a high-resolution large-target-area double-telecentric lens according to claim 1, characterized in that: The optical axes of the first lens G1, the second lens G2, the third lens G3, the fourth lens G4, the fifth lens G5, the sixth lens G6, the seventh lens G7, the eighth lens G8, the ninth lens G9 and the tenth lens G10 are all on a predetermined optical axis; The aperture of the diaphragm T is a circular hole, and the center of the circular hole is on the predetermined optical axis.

9. The optical system of a high-resolution large-target-area double-telecentric lens according to claim 1, characterized in that: The second cemented lens U2 is a new type of cemented lens, and its cemented surface is a converging surface for compensating for spherical aberration.

10. A high-resolution large-target-area bi-telecentric lens, characterized in that: An optical system comprising a high-resolution, large-target-area, double-telecentric lens as described in any one of claims 1 to 9.

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