Machine vision prime lens with improved structure and focal length of 12mm

Abstract

The utility model discloses a machine vision prime lens with an improved structure and a focal length of 12mm, which comprises a first lens, a second lens arranged on the right side of the first lens, a first diaphragm arranged on the right side of the second lens, a third lens arranged on the right side of the first diaphragm, a fourth lens arranged on the right side of the third lens, and a fifth lens arranged on the right side of the fourth lens. The fourth lens and the fifth lens are bonded through optical glue to form a gluing piece, the focal length of the first lens is fg1, the focal length of the gluing piece is fu4, the focal length of the lens is f, and the optical system meets the relational expression of 0.4 lt; fg1 / flt; 1, 1.3, 0.3 lt; fu4 / flt; and 0.8. The utility model has the advantages of novel design, simple structure, simple and convenient assembly, low cost, good optical performance, clear imaging and high resolution, and realizes the change of the object distance from 0.1 m to infinity.

Description

TECHNICAL FIELD

[0001] The utility model relates to technical field of lens especially relates to a focal length 12mm machine vision fixed focus lens of structure improvement. BACKGROUND

[0002] Today, the industrial automation develops rapidly, and the machine vision fixed focus lens is widely applied in the automatic production equipment, in order to meet the accuracy of judgment, the measurement precision in the automatic production, detection and measurement of automatic equipment, the machine vision lens must have the imaging clear and stable, low distortion, wide working distance and large field of view. The resolution of the traditional machine vision lens is mostly megapixel or two million pixels, and the definition is insufficient, and the distortion is greater than 1%.

[0003] The utility model discloses a focal length 12mm machine vision fixed focus lens, including the first lens, the first lens one side is installed with the second lens, and the second lens one side is installed with the third lens, the third lens one side is installed with the fourth lens, and the fourth lens one side is installed with the diaphragm, the diaphragm one side is installed with the fifth lens, and the fifth lens one side is installed with the sixth lens, the sixth lens one side is installed with the seventh lens, and the seventh lens one side is installed with the eighth lens, the eighth lens one side is installed with the ninth lens, and the ninth lens one side is installed with the tenth lens, the third lens and the fourth lens are bonded into the first cemented piece through optical cement, the fifth lens and the sixth lens are bonded into the second cemented piece through optical cement, the ninth lens and the tenth lens are bonded into the third cemented piece through optical cement, the first lens focal length fg1, the third cemented piece focal length fU9, lens focal length f, and the optical system satisfies the relationship formula 2.1 < |fg1 / f| < 2.6, 6.9 < |fU8 / f| < 8.5.

[0004] It should be pointed out that, for the above-mentioned lens, a multi-lens combination is adopted, which has a complex structure, leading to difficult assembly and high production cost. UTILITY MODEL CONTENTS

[0005] The utility model discloses a focal length 12mm machine vision fixed focus lens of structure improvement, which has novel design, simple structure, easy assembly, low cost, good optical performance, clear imaging, high resolution and a change of object distance from 0.1m to infinity.

[0006] To achieve the above-mentioned purpose, the utility model realizes the following technical scheme.

[0007] A structure improved focal length 12mm machine vision fixed focus lens, comprising a first lens, the right side of the first lens is provided with a second lens, and the right side of the second lens is provided with a first diaphragm, the right side of the first diaphragm is provided with a third lens, and the right side of the third lens is provided with a fourth lens, the right side of the fourth lens is provided with a fifth lens, and the right side of the fifth lens is provided with a second diaphragm, the fourth lens and the fifth lens are bonded into a cemented plate by optical cement, the focal length of the first lens is fg1, the focal length of the cemented plate is fu4, and the focal length of the lens is f, and the optical system satisfies the relationship: 0.4<|fg1 / f|<1.3, 0.3<|fu4 / f|<0.8.

[0008] Wherein, the first lens, the second lens, the first diaphragm and the third lens constitute a moving lens group, and the fourth lens, the fifth lens and the second diaphragm constitute a fixed lens group.

[0009] Wherein, the lens surface of the first lens, the second lens, the third lens, the fourth lens and the fifth lens is spherical.

[0010] Wherein, the refractive index of the first lens to the fifth lens is n1, n2, n3, n4, n5 in turn, the Abbe number of the first lens to the fifth lens is v1, v2, v3, v4, v5 in turn, and the following relationship is satisfied: 1.7<n1<1.9, 36.2<v1<39.2; 1.7<n2<1.9, 22.7<v2<24.62; 1.7<n3<1.9, 35.83<v3<38.21; 1.5<n4<1.7, 61.82<v4<64.51; 1.7<n5<1.9, 22.68<v5<24.54.

[0011] Wherein, the aperture of the first diaphragm and the second diaphragm is Adjustable.

[0012] The beneficial effects of the present invention are as follows: the present invention provides a structurally improved 12mm focal length fixed-focus lens for machine vision, comprising a first lens, a second lens mounted on the right side of the first lens, a first aperture mounted on the right side of the second lens, a third lens mounted on the right side of the first aperture, a fourth lens mounted on the right side of the third lens, a fifth lens mounted on the right side of the fourth lens, a second aperture mounted on the right side of the fifth lens, the fourth lens and the fifth lens bonded together by optical glue to form a laminate, the focal length of the first lens being fg1, the focal length of the laminate being fu4, the focal length of the lens being f, and the optical system satisfying the relationship: 0.4 <|fg1 / f| < 1.3, 0.3 <|fu4 / f| < 0.8. The present invention, through the dual-aperture structural arrangement, achieves a change in object distance from 0.1m to infinity, has excellent optical performance, and achieves clear imaging and high resolution. The present invention has a novel design, a simple structure, is easy to assemble, and is low in cost, and has excellent optical performance, achieving clear imaging and high resolution, and achieving a change in object distance from 0.1m to infinity. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described below with reference to the accompanying drawings. However, the embodiments in the accompanying drawings do not constitute any limitation to the present invention.

[0014] Figure 1 It is a structural diagram of the utility model;

[0015] Figure 2 This is a light diagram of the present invention.

[0016] exist Figure 1 These include:

[0017] 1——first lens 2——second lens

[0018] 3 - First aperture 4 - Third lens

[0019] 5 - the fourth lens 6 - the fifth lens

[0020] 7——Second aperture 8——Glued film. DETAILED DESCRIPTION

[0021] The present invention will be described below in conjunction with specific implementation methods.

[0022] like Figure 1As shown in the figure, a structure improved focal length 12mm machine vision fixed focus lens, including first lens 1, first lens 1 right side is equipped with the second lens 2, and the second lens 2 right side is equipped with the first diaphragm 3, the first diaphragm 3 right side is equipped with the third lens 4, and the third lens 4 right side is equipped with the fourth lens 5, the fourth lens 5 right side is equipped with the fifth lens 6, and the fifth lens 6 right side is equipped with the second diaphragm 7, the fourth lens 5 and the fifth lens 6 are bonded into a cemented plate 8 by optical glue, the focal length of the first lens 1 is fg1, the focal length of the cemented plate 8 is fu4, the focal length of the lens is f, and the optical system satisfies the relationship: 0.4<|fg1 / f|<1.3, 0.3<|fu4 / f|<0.8.

[0023] As preferred in the embodiment, the first lens 1, the second lens 2, the first diaphragm 3 and the third lens 4 form a moving lens group A, and the fourth lens 5, the fifth lens 6 and the second diaphragm 7 form a fixed lens group B.

[0024] As preferred in the embodiment, the lens surfaces of the first lens 1, the second lens 2, the third lens 4, the fourth lens 5 and the fifth lens 6 are all spherical surfaces.

[0025] Further, the refractive indexes of the first lens 1 to the fifth lens 6 are n1, n2, n3, n4, n5 in sequence, and the Abbe numbers of the first lens 1 to the fifth lens 6 are v1, v2, v3, v4, v5 in sequence, and the following relationship is satisfied: 1.7<n1<1.9, 36.2<v1<39.2; 1.7<n2<1.9, 22.7<v2<24.62; 1.7<n3<1.9, 35.83<v3<38.21; 1.5<n4<1.7, 61.82<v4<64.51; 1.7<n5<1.9, 22.68<v5<24.54.

[0026] Further, the apertures of the first diaphragm 3 and the second diaphragm 7 are adjustable.

[0027] The embodiment of the utility model provides a structure improved focal length 12mm machine vision fixed focus lens, the following table 1 lists the related parameters of each lens, including surface type, curvature radius, thickness, refractive index of material and Abbe number:

[0028]

[0029] Table 1

[0030] ​In the table 1, the optical system surfaces are arranged in sequence, and are called lens front surface on the object side and lens rear surface on the image side. S1 and S2 are the front surface and the rear surface of the first lens; S3 and S4 are the front surface and the rear surface of the second lens; S5 and S6 are the front surface and the rear surface of the third lens; S7 is the diaphragm surface; S8 and S9 are the front surface and the rear surface of the fourth lens. The curvature radius value is positive, indicating that the curvature center is on the image side; the curvature radius value is negative, indicating that the curvature center is on the object side. The thickness value represents the distance between the current optical surface and the intersection point of the next surface on the optical axis. The refractive index represents the refractive index of the medium between the current surface and the next surface. When the refractive index is blank, it represents the refractive index of air.

[0031] According to the table 1, in the embodiment, the setting of the related parameters of each lens meets the condition requirements of the visual lens according to the application, has good optical performance, achieves clear imaging and high resolution, and realizes the change of the object distance from 0.1 m to infinity.

[0032] The above is only a preferred embodiment of the application, and for those skilled in the art, according to the idea of the application, the specific implementation and application range can be changed, and the content of the specification should not be understood as a limitation of the application.

Claims

1. A machine vision fixed-focus lens with an improved structure and a focal length of 12mm, characterized by: The invention comprises a first lens (1), a second lens (2) is arranged on the right side of the first lens (1), a first aperture (3) is arranged on the right side of the second lens (2), a third lens (4) is arranged on the right side of the first aperture (3), a fourth lens (5) is arranged on the right side of the third lens (4), a fifth lens (6) is arranged on the right side of the fourth lens (5), a second aperture (7) is arranged on the right side of the fifth lens (6), the fourth lens (5) and the fifth lens (6) are bonded to form a bonding sheet (8) by optical glue, the focal length of the first lens (1) is fg1, the focal length of the bonding sheet (8) is fu4, the focal length of the lens is f, and the optical system satisfies the relationship: 0.4<|fg1 / f|<1.3, 0.3<|fu4 / f|<0.

8.

2. The machine vision fixed-focus lens with a structural improvement of 12 mm focal length according to claim 1, characterized in that: The first lens (1), the second lens (2), the first aperture (3) and the third lens (4) form a movable lens group (A), and the fourth lens (5), the fifth lens (6) and the second aperture (7) form a fixed lens group (B).

3. The machine vision fixed-focus lens with an improved structure and a focal length of 12 mm according to claim 1, characterized in that: The lens surfaces of the first lens (1), the second lens (2), the third lens (4), the fourth lens (5) and the fifth lens (6) are all spherical.

4. The machine vision fixed-focus lens with an improved structure and a focal length of 12 mm according to claim 1, characterized in that: The refractive indices of the first lens (1) to the fifth lens (6) are n1, n2, n3, n4, and n5, respectively, and the Abbe numbers of the first lens (1) to the fifth lens (6) are v1, v2, v3, v4, and v5, respectively, satisfying the following relationship 1.7 <n1<1.9,36.2<v1<39.2;1.7<n2<1.9,22.7<v2<24.62;1.7<n3<1.9,35.83<v3<38.21;1.5<n4<1.7,61.82<v4<64.51;1.7<n5<1.9,22.68<v5<24.54。 5. The machine vision fixed-focus lens with an improved structure and a focal length of 12 mm according to claim 1, characterized in that: The apertures of the first diaphragm (3) and the second diaphragm (7) are Adjustable.

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