An industrial inspection line scan lens

Abstract

The application belongs to the technical field of optical lenses, and specifically provides an industrial detection line scanning lens, which comprises a first lens group, a diaphragm and a second lens group arranged in sequence from an object side to an image side; the optical power of the first lens group is positive; the optical power of the second lens group is positive, and the first lens group and the second lens group as a whole can move along the optical axis direction; wherein the first lens group comprises at least six lenses arranged along the optical axis direction, and the second lens group comprises at least four lenses arranged along the optical axis direction. In the application, the first lens group with positive optical power and the second lens group with positive optical power arranged in sequence from the object side to the image side can realize a large NA value of the lens, thereby ensuring a large target surface of the lens; the first lens group has at least six lenses, and the second lens group has at least four lenses, thereby ensuring a high magnification of the lens, and further improving the resolution of the lens, reducing distortion, and realizing a high resolving power of the lens.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of optical lenses, and more particularly to an industrial detection line scanning lens. BACKGROUND

[0002] With the rapid development of China's social economy, the demand for various commodities in the market has increased, thereby driving the rapid development of the optical equipment industry, and becoming the most potential industry in the domestic market. The increasing optical awareness of consumers and the increasingly stringent requirements for optics of consumers bring more development space to line scanning lenses, but also bring various survival pressures to them.

[0003] In recent years, the demand for high-magnification and large-target line scanning lenses in the market is increasing, but due to process limitations, it is difficult for the lenses of this type on the market to achieve high resolution while considering high magnification and large target. SUMMARY

[0004] The purpose of the embodiment of the application is to provide an industrial detection line scanning lens to solve the technical problem of how to achieve high resolution while considering high magnification and large target in the prior art.

[0005] To achieve the above purpose, the technical solution adopted by the application is: providing an industrial detection line scanning lens, comprising a first lens group, a diaphragm and a second lens group arranged in order from the object side to the image side; the optical power of the first lens group is positive; the optical power of the second lens group is positive, and the first lens group and the second lens group as a whole can move along the optical axis direction; wherein the first lens group comprises at least six lenses arranged along the optical axis direction, and the second lens group comprises at least four lenses arranged along the optical axis direction.

[0006] Optionally, the first lens group comprises four positive power lenses and two or three negative power lenses; and the first lens group comprises two or three double cemented lenses.

[0007] Optionally, the second lens group comprises two negative power lenses and at least two positive power lenses; and the second lens group comprises one or two cemented lenses.

[0008] Optionally, the first lens group comprises a first cemented lens arranged close to the object side and a second cemented lens arranged close to the image side; the first cemented lens comprises a negative-power lens and a positive-power lens arranged in sequence from the object side to the image side; the first cemented lens is concave close to the object surface and convex close to the image surface; the second cemented lens comprises a positive-power lens and a negative-power lens arranged in sequence from the object side to the image side; the first cemented lens is convex close to the object surface and concave close to the image surface.

[0009] Optionally, the first lens in the second lens group from the object side to the image side is a negative-power lens, and the shape of the first lens close to the object surface is concave; the last lens in the second lens group from the object side to the image side is a positive-power lens, and the last lens is a biconvex lens.

[0010] Optionally, the focal length of the industrial detection line scanning lens and the focal length of the first lens group satisfy the following conditional expression:

[0011] 1.200≤f / f1≤1.450;

[0012] In the expression, f1 is the focal length value of the first lens group, and f is the focal length value of the industrial detection line scanning lens.

[0013] Optionally, the focal length of the industrial detection line scanning lens and the focal length of the second lens group satisfy the following conditional expression:

[0014] 0.050≤f / f2≤0.350;

[0015] In the expression, f2 is the focal length value of the second lens group, and f is the focal length value of the industrial detection line scanning lens.

[0016] Optionally, the refractive index and Abbe number of the three positive-power lenses in the first lens group satisfy the following conditional expression:

[0017] 1.40≤ndL x1 ≤1.60;

[0018] 65.0≤vdL x1 ≤95.5;

[0019] In the expression, nd Lx1 is the refractive index of the X1th lens in the first lens group, and vdL x1 is the Abbe number of the X1th lens in the first lens group.

[0020] Optionally, the refractive index and Abbe number of the two positive-power lenses in the second lens group satisfy the following conditional expression:

[0021] 1.40≤ndL x2 ≤1.60;

[0022] 65.0≤vdL x2 ≤95.5;

[0023] In the formula, nd Lx2 Let vdL be the refractive index of the X2-th lens in the first lens group. x2 Let be the Abbe number of the X2-th lens in the first lens group.

[0024] Optionally, the industrial inspection line scan lens satisfies the following condition:

[0025] 0.170≤H / L≤0.210;

[0026] In the formula, H is the full image height of the industrial inspection line scan lens, and L is the total optical length of the industrial inspection line scan lens.

[0027] The beneficial effects of the industrial inspection line scan lens provided in this application are as follows: Compared with the prior art, in this application, a first lens group with positive optical power and a second lens group with positive optical power are arranged sequentially from the object side to the image side, which can achieve a larger NA value of the lens, thereby ensuring a large target surface of the lens; the first lens group has at least six lenses and the second lens group has at least four lenses, which ensures a high magnification of the lens, thereby improving the resolution of the lens, reducing distortion, and achieving a higher resolution of the lens. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application, 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 this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of an industrial inspection line scan lens provided in Embodiment 1 of this application;

[0030] Figure 2 MTF chart of an industrial inspection line scan lens provided in Embodiment 1 of this application;

[0031] Figure 3 A transverse chromatic aberration map of an industrial inspection line scan lens provided in Embodiment 1 of this application;

[0032] Figure 4 This is a schematic diagram of the structure of an industrial inspection line scan lens provided in Embodiment 2 of this application;

[0033] Figure 5 An MTF chart of an industrial detection line scanning lens provided in Embodiment Two of the present application;

[0034] Figure 6 An axial chromatic aberration chart of an industrial detection line scanning lens provided in Embodiment Two of the present application;

[0035] Figure 7 A structural schematic diagram of an industrial detection line scanning lens provided in Embodiment Three of the present application;

[0036] Figure 8 An MTF chart of an industrial detection line scanning lens provided in Embodiment Three of the present application;

[0037] Figure 9 An axial chromatic aberration chart of an industrial detection line scanning lens provided in Embodiment Three of the present application;

[0038] In the drawings, various elements are labeled with reference numerals, and the following is a list of the reference numerals and the elements they represent:

[0039] G1 - first lens group; G2 - second lens group;

[0040] L01 - first lens; L02 - second lens; L03 - third lens; L04 - fourth lens; L05 - fifth lens; L06 - sixth lens; L07 - seventh lens; L08 - eighth lens; L09 - ninth lens; L10 - tenth lens; L11 - eleventh lens; L12 - twelfth lens; L13 - thirteenth lens; L14 - fourteenth lens; L15 - fifteenth lens. DETAILED DESCRIPTION

[0041] In order to make the technical problems to be solved by the present application, the technical solutions and beneficial effects clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not intended to limit the present application.

[0042] It should be noted that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or indirectly connected to the other element.

[0043] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0044] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0045] Please refer to Figures 1 to 9 , now the industrial detection line scanning lens provided by the embodiment of the present application will be described. The industrial detection line scanning lens comprises a first lens group G1, a diaphragm and a second lens group G2 arranged in sequence from the object side to the image side; the focal power of the first lens group G1 is positive; the focal power of the second lens group G2 is positive, and the first lens group G1 and the second lens group G2 as a whole can move along the optical axis direction; wherein the first lens group G1 comprises at least six lenses arranged along the optical axis direction, and the second lens group G2 comprises at least four lenses arranged along the optical axis direction. In this embodiment, the optical axis direction refers to the direction from the object side to the image side, or the direction from the image side to the object side.

[0046] The industrial detection line scanning lens provided by the embodiment of the present application compared with the prior art, in the embodiment of the present application, the first lens group G1 with positive focal power and the second lens group G2 with positive focal power are arranged in sequence from the object side to the image side, which can realize a larger NA value (NA value is a dimensionless number used to measure the angle range of light that can be collected by an optical system) of the lens, and thus ensures a large target surface of the lens; the first lens group G1 has at least six lenses, and the second lens group G2 has at least four lenses, which ensures a high magnification of the lens, and thus can improve the resolution of the lens, reduce distortion, and realize a higher resolution of the lens.

[0047] In an embodiment of the present application, the first lens group G1 comprises four positive focal power lenses and two or three negative focal power lenses; and the first lens group G1 comprises two or three double cemented lenses.

[0048] In the embodiment, the first lens group G1 adopts reasonable collocation of positive and negative power lenses to reduce aberration of the optical system; and multiple double cemented lenses are adopted to reasonably correct chromatic aberration, reduce the incident angle of light, reduce the sensitivity of the optical system, and achieve higher resolution.

[0049] In an embodiment of the present application, the second lens group G2 includes two negative power lenses and at least two positive power lenses; and the second lens group G2 includes one or two cemented lenses.

[0050] In the embodiment, the second lens group G2 adopts reasonable collocation of positive and negative power lenses to reduce aberration of the optical system; and multiple double cemented lenses are adopted to reasonably correct chromatic aberration, reduce the incident angle of light, reduce the sensitivity of the optical system, and achieve higher resolution.

[0051] As shown in Figure 3 , Figure 6 and Figure 9 , the embodiment well corrects the sagittal chromatic aberration of the industrial detection line scanning lens, so that the imaging picture does not have obvious purple edge, red edge or blurred phenomenon, and meets the high-resolution image quality requirement.

[0052] In an embodiment of the present application, the first lens group G1 includes a first cemented lens arranged close to the object side and a second cemented lens arranged close to the image side; the first cemented lens includes a negative power lens and a positive power lens arranged in sequence from the object side to the image side; the first cemented lens is concave close to the object surface side, and the first cemented lens is convex close to the image surface side; the second cemented lens includes a positive power lens and a negative power lens arranged in sequence from the object side to the image side; the first cemented lens is convex close to the object surface side, and the first cemented lens is concave close to the image surface side.

[0053] In the embodiment, the first cemented lens and the second cemented lens use the lens shape and the distribution of the cemented lens described above, so that the imaging system can effectively achieve a larger NA value, reduce the chromatic aberration of the system, reduce the incident angle of light, reduce the sensitivity of the optical system, and achieve higher resolution.

[0054] In an embodiment of the present application, the first lens in the second lens group G2 from the object side to the image side is a negative power lens, and the shape of the first lens close to the object surface side is concave; the last lens in the second lens group G2 from the object side to the image side is a positive power lens, and the last lens is a double convex lens, that is, the shape of the last lens close to the object surface side and close to the image surface side is convex. Using the lens shape described above can reduce the tolerance sensitivity of the optical system, reduce the chief ray angle, and improve the relative luminance of the system.

[0055] In an embodiment of the present application, the focal length of the industrial detection line scan lens and the focal length of the first lens group G1 satisfy the following conditional expression:

[0056] 1.200≤f / f1≤1.450;

[0057] In the expression, f1 is the focal length value of the first lens group G1, and f is the focal length value of the industrial detection line scan lens.

[0058] In the embodiment, the f1 / f satisfies the above conditional expression, which can make the light pass through the diaphragm at a small angle more gently, reduce the sensitivity, ensure the stability of the front and rear of the optical system, and realize the miniaturization of the entire industrial detection line scan lens.

[0059] In an embodiment of the present application, the focal length of the industrial detection line scan lens and the focal length of the second lens group G2 satisfy the following conditional expression:

[0060] 0.050≤f / f2≤0.350;

[0061] In the expression, f2 is the focal length value of the second lens group G2, and f is the focal length value of the industrial detection line scan lens.

[0062] In the embodiment, the f2 / f satisfies the above conditional expression, which can effectively bear the refractive power distribution of the system, also ensures the overall length of the optical system, and realizes the miniaturization of the entire industrial detection line scan lens.

[0063] In an embodiment of the present application, the refractive index and Abbe number of the three positive refractive power lenses in the first lens group G1 satisfy the following conditional expression:

[0064] 1.40≤ndL x1 ≤1.60;

[0065] 65.0≤vdL x1 ≤95.5;

[0066] In the expression, nd Lx1 is the refractive index of the X1th lens in the first lens group G1, and vdL x1 is the Abbe number of the X1th lens in the first lens group G1.

[0067] In the embodiment, the refractive index and Abbe number of the last positive refractive power lens of the first lens group G1 satisfy the above conditional expression, which can effectively reduce the chromatic aberration of the optical system and improve the imaging quality of the optical system.

[0068] In an embodiment of the present application, the refractive index and Abbe number of the two positive refractive power lenses in the second lens group G2 satisfy the following conditional expression:

[0069] 1.40≤ndLx2 ≤1.60;

[0070] 65.0≤vdL x2 ≤95.5;

[0071] wherein, nd Lx2 is the refractive index of the X2th lens in the first lens group G1, and vdL x2 is the Abbe number of the X2th lens in the first lens group G1.

[0072] In the embodiment, the refractive index and the Abbe number of the last positive power lens in the second lens group G2 satisfy the above conditional expression, which can effectively reduce the chromatic aberration of the optical system and improve the imaging quality of the optical system.

[0073] In one embodiment of the present application, the industrial detection line scanning lens satisfies the following conditional expression:

[0074] 0.170≤H / L≤0.210;

[0075] wherein, H is the total image height of the industrial detection line scanning lens, and L is the total optical length of the industrial detection line scanning lens.

[0076] In the embodiment, the H / L satisfies the above conditional expression, which can ensure the proportion of the optical system in the industrial detection line scanning lens and ensure the volume requirement of the optical system.

[0077] Please refer to Figure 2 , Figure 5 and Figure 8 , MTF is the abbreviation of Modulation Transfer Function (Modulation Transfer Function), and it can be seen from the figure that the imaging consistency of the center and edge of the industrial detection line scanning lens is good.

[0078] Embodiment one:

[0079] In the embodiment, the conditional expression data of the industrial detection line scanning lens please refer to Table 1, and the lens parameters please refer to Table 2.

[0080] Table 1:

[0081] Example One [["f / f1"]] 1.213 [f / f2] 0.341 H / L 0.200

[0082] Table 2:

[0083]

[0084]

[0085] Please refer to Figures 1 to 3In the embodiment, the first lens group G1 includes first lens L01, second lens L02, third lens L03, fourth lens L04, fifth lens L05 and sixth lens L06 arranged in order from the object side to the image side; wherein the first lens L01 and the second lens L02 form a first doublet, and the fifth lens L05 and the sixth lens L06 form a second doublet. Figure 1 In the embodiment, STOP is a diaphragm, and IMAGE is an image plane.

[0086] In the embodiment, the second lens group G2 includes seventh lens L07, eighth lens L08, ninth lens L09, tenth lens L10 arranged in order from the object side to the image side; wherein the eighth lens L08 and the ninth lens L09 form a third doublet.

[0087] In the embodiment, the total length of the optical system TTL = 428.94, the focal length of the system f = 121.3, and the object side NA = 0.12.

[0088] In the embodiment, the second lens L02 is a positive lens, and the refractive index and Abbe number of the second lens L02 are ndL2 = 1.59 and vdL2 = 68.6.

[0089] In the embodiment, the fourth lens L04 is a positive lens, and the refractive index and Abbe number of the fourth lens L04 are ndL4 = 1.59 and vdL4 = 68.6.

[0090] In the embodiment, the fifth lens L05 is a positive lens, and the refractive index and Abbe number of the fifth lens L05 are ndL5 = 1.44 and vdL5 = 95.1.

[0091] In the embodiment, the ninth lens L09 is a positive lens, and the refractive index and Abbe number of the ninth lens L09 are ndL9 = 1.44 and vdL9 = 95.1.

[0092] In the embodiment, the tenth lens is a positive lens, and the refractive index and Abbe number of the tenth lens are ndL10 = 1.50 and vdL10 = 81.6.

[0093]

[0094] Embodiment two:

[0095] In the embodiment, the conditional data of the industrial detection line scanning lens is shown in Table 3, and the lens parameters are shown in Table 4.

[0096] Table 3:

[0097] Example Two [["f / f1"]] 1.404 [f / f2] 0.136 H / L 0.178

[0098] Table 4:

[0099] ​

[0100] Please see Figures 4 to 6 In the embodiment, the first lens group G1 includes first lens L01, second lens L02, eleventh lens L11, twelfth lens L12, third lens L03, fifth lens L05 and sixth lens L06 arranged in order from the object side to the image side; wherein the first lens L01 and the second lens L02 form a first doublet, the fifth lens L05 and the sixth lens L06 form a second doublet; the eleventh lens L11 and the twelfth lens L12 form a fourth doublet. Figure 4 In the embodiment, STOP is a diaphragm, and IMAGE is an image plane.

[0101] In the embodiment, the second lens group G2 includes seventh lens L07, eighth lens L08, ninth lens L09, tenth lens arranged in order from the object side to the image side; wherein the eighth lens L08 and the ninth lens L09 form a third doublet.

[0102] In the embodiment, the total length of the optical system TTL = 482.90, the focal length of the system f = 133.69, and the object side NA = 0.12.

[0103] In the embodiment, the second lens L02 is a positive power lens, and the refractive index and Abbe number of the second lens L02 are: nd L2 = 1.59; and vd L2 = 68.6.

[0104] In the embodiment, the eleventh lens L11 is a positive power lens, and the refractive index and Abbe number of the eleventh lens L11 are: nd L11 = 1.59; and vd L11 = 68.6.

[0105] In the embodiment, the fifth lens L05 is a positive power lens, and the refractive index and Abbe number of the fifth lens L05 are: nd L5 = 1.44; and vd L5 = 95.1.

[0106] In the embodiment, the ninth lens L09 is a positive power lens, and the refractive index and Abbe number of the ninth lens L09 are: nd L9 = 1.44; and vd L9 = 95.1.

[0107] In the embodiment, the tenth lens is a positive power lens, and the refractive index and Abbe number of the tenth lens are: nd L10 = 1.50; and vd L10 = 81.6.

[0108] Embodiment three:

[0109] In the embodiment, the conditional data of the industrial detection line scanning lens is shown in Table 5, and the lens parameters are shown in Table 6.

[0110] Table 5:

[0111]

[0112]

[0113] Table 6:

[0114]

[0115] Please refer to Figures 7 to 9 In the embodiment, the first lens group G1 includes the first lens L01, the second lens L02, the third lens L03, the fourth lens L04, the fifth lens L05 and the sixth lens L06 arranged in sequence from the object side to the image side; wherein the first lens L01 and the second lens L02 form a first double cemented lens, and the fifth lens L05 and the sixth lens L06 form a second double cemented lens.

[0116] In the embodiment, the second lens group G2 includes the thirteenth lens L13, the fourteenth lens L14, the fifteenth lens L15, the eighth lens L08, the ninth lens L09 and the tenth lens arranged in sequence from the object side to the image side; wherein the thirteenth lens L13, the fourteenth lens L14 and the fifteenth lens L15 form a triple cemented lens, and the eighth lens L08 and the ninth lens L09 form a third double cemented lens. Figure 7 In the embodiment, STOP is a diaphragm, and IMAGE is an image plane.

[0117] In the embodiment, the total length of the optical system TTL = 424.04, the focal length of the system f = 118.98, and the object side NA = 0.12.

[0118] In the embodiment, the third lens L03 is a positive refractive power lens, and the refractive index and Abbe number of the third lens L03 are nd L3 = 1.50; and vd L3 = 81.6.

[0119] In the embodiment, the fourth lens L04 is a positive refractive power lens, and the refractive index and Abbe number of the fourth lens L04 are nd L4 = 1.50; and vd L4 = 81.6.

[0120] In the embodiment, the fifth lens L05 is a positive refractive power lens, and the refractive index and Abbe number of the fifth lens L05 are nd L5 = 1.50; and vd L5 = 81.6.

[0121] In this embodiment, the ninth lens L09 is a positive power lens, and the refractive index and Abbe number of the ninth lens L09 are: nd L9 = 1.62; vd L9 = 63.4.

[0122] In this embodiment, the tenth lens is a positive power lens, and the refractive index and Abbe number of the tenth lens are: nd L10 = 1.64; vd L10 = 60.2.

[0123] The above only describes the preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An industrial inspection line scan lens characterized by, The first lens group, the diaphragm and the second lens group are arranged in sequence from the object side to the image side; The first lens group has positive refractive power; The second lens group has positive refractive power, and the first lens group and the second lens group can move along the optical axis direction as a whole; The first lens group comprises at least six lenses arranged along the optical axis direction, and the second lens group comprises at least four lenses arranged along the optical axis direction; The first lens group comprises four positive refractive power lenses and two or three negative refractive power lenses, and the first lens group comprises two or three double cemented lenses; The first lens group comprises a first cemented lens arranged close to the object side and a second cemented lens arranged close to the image side; the first cemented lens comprises a negative refractive power lens and a positive refractive power lens arranged in sequence from the object side to the image side; the first cemented lens is concave close to the object side and convex close to the image side; the second cemented lens comprises a positive refractive power lens and a negative refractive power lens arranged in sequence from the object side to the image side; the second cemented lens is convex close to the object side and concave close to the image side; The second lens group comprises two negative refractive power lenses and at least two positive refractive power lenses, and the second lens group comprises one or two cemented lenses; The first lens in the second lens group from the object side to the image side is a negative refractive power lens, and the shape of the first lens close to the object side is concave; the last lens in the second lens group from the object side to the image side is a positive refractive power lens, and the last lens is a double convex lens.

2. The industrial inspection line-scan lens of claim 1, wherein, The focal length of the industrial detection line scanning lens and the focal length of the first lens group satisfy the following condition formula: 1.200≤f / f1≤1.450; In the formula, f1 is the focal length value of the first lens group, and f is the focal length value of the industrial detection line scanning lens.

3. The industrial inspection line-scan lens of claim 1, wherein, The focal length of the industrial detection line scanning lens and the focal length of the second lens group satisfy the following condition formula: 0.050≤f / f2≤0.350; In the formula, f2 is the focal length value of the second lens group, and f is the focal length value of the industrial detection line scanning lens.

4. The industrial inspection line-scan lens of claim 1, wherein, The refractive index and Abbe number of the three positive refractive power lenses in the first lens group satisfy the following condition formula: 1.40 < ndL x1 ≤ 1.60; 65.0 < vdL x1 ≤ 95.5; In the formula, ndL x1 Let vdL be the refractive index of the X1-th lens in the first lens group. x1 Let X be the Abbe number of the X1-th lens in the first lens group.

5. The industrial inspection line-scan lens of claim 1, wherein, The refractive index and Abbe number of the two positive refractive power lenses in the second lens group satisfy the following condition formula: 1.40 < ndL x2 ≤ 1.60; 65.0 < vdL x2 ≤ 95.5; In the formula, ndL x2 Let vdL be the refractive index of the X2-th lens in the second lens group. x2 It is the Abbe number of the X2-th lens in the second lens group.

6. The industrial line-scan lens of any of claims 1-5, wherein, The industrial detection line scanning lens satisfies the following condition formula: 0.170≤H / L≤0.210; In the formula, H is the total image height of the industrial detection line scanning lens, and L is the total optical length of the industrial detection line scanning lens.

Images