Optical imaging module

Abstract

The present invention relates to an optical imaging module, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a variable aperture, a sixth lens, a seventh lens, an eighth lens and a ninth lens arranged in sequence along an optical axis from an object plane to an image plane; the first lens is a convex-concave spherical negative lens, the second lens is a convex-concave spherical positive lens, the third lens is a convex-concave spherical positive lens, the fourth lens and the fifth lens are bonded together by photosensitive adhesive to form a first bonded lens, the fourth lens is a biconvex spherical positive lens, the fifth lens is a biconcave spherical negative lens, the sixth lens and the seventh lens are bonded together by photosensitive adhesive to form a second bonded lens, the sixth lens is a biconcave spherical negative lens, the seventh lens is a biconvex spherical positive lens, the eighth lens is a convex-concave spherical positive lens, and the ninth lens is a concave-convex spherical positive lens. It can become an imaging lens with a large light flux.

Description

Technical Field

[0001] The present invention relates to the technical field of scanning lenses, and in particular to an optical imaging module. Background Art

[0002] With the rapid development of social economy, the demand for machine vision is increasing day by day, especially in many industries such as electronic manufacturing, LCD screen defect detection, measurement of mobile phone touch screen lines and dimensions, and food packaging. Line scan machine vision lenses have been widely used to improve production efficiency and yield rate. The requirements for the optical performance and measurement range of line scan machine vision lenses are also getting higher and higher. However, the existing line scan lenses in China generally have narrow measurement range, large distortion, and insufficient light transmission. Summary of the invention

[0003] The object of the present invention is to provide an optical imaging module to provide an imaging lens with large luminous flux.

[0004] The technical solution of the present invention is:

[0005] An optical imaging module comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a variable aperture, a sixth lens, a seventh lens, an eighth lens and a ninth lens which are sequentially arranged along an optical axis from an object plane to an image plane; the first lens is a convex-concave spherical negative lens, the second lens is a convex-concave spherical positive lens, the third lens is a convex-concave spherical positive lens, the fourth lens and the fifth lens are bonded together by photosensitive adhesive to form a first bonded lens, the fourth lens is a biconvex spherical positive lens, the fifth lens is a biconcave spherical negative lens, the sixth lens and the seventh lens are bonded together by photosensitive adhesive to form a second bonded lens, the sixth lens is a biconcave spherical negative lens, the seventh lens is a biconvex spherical positive lens, the eighth lens is a concave-convex spherical positive lens, and the ninth lens is a concave-convex spherical positive lens.

[0006] Preferably, the first lens is a low dispersion lens, Nd=1.59, Vd=36.4; the second lens is a high refractive index low dispersion lens, Nd=1.75, Vd=35.0; the third lens is a low dispersion lens, Nd=1.64, Vd=55.5; the fourth lens is a high dispersion lens, Vd=68.3; the fifth lens is a low dispersion lens, Vd=38.01; the sixth lens is a low dispersion lens, Vd=38.8; the seventh lens is a high dispersion lens, Vd=68.3; the eighth lens is a high refractive index low dispersion lens, Nd=1.76, Vd=52.3; the ninth lens is a high refractive index low dispersion lens, Nd=1.73, Vd=54.7. By designing the parameters of the 7 groups of lenses, the maximum aperture can reach more than 2.6.

[0007] Preferably, the radius of the front surface of the first lens is 365.499 mm, the thickness is 5.2 mm, the radius of the rear surface of the first lens is 33.891 mm, the thickness is 21.2 mm, and the refractive index of the first lens is 1.59; the radius of the front surface of the second lens is 46.857 mm, the thickness is 7.0 mm, the radius of the rear surface of the second lens is 403.000 mm, the thickness is 4.6 mm, and the refractive index of the second lens is 1.75; the third lens The radius of the front surface of the first cemented lens is 30.4714mm, the thickness is 5.0mm, the radius of the rear surface of the third lens is 576.000mm, the thickness is 0.15mm, and the refractive index of the third lens is 1.64; the radius of the front surface of the fourth lens is 18.182mm, the thickness is 7.0mm, and the refractive index of the fourth lens is 1.6, the radius of the cemented surface of the first cemented lens is -58.814mm, the thickness is 2mm, and the refractive index is 1.6, the rear surface of the fifth lens is -58.814mm, the thickness is 2mm, and the refractive index is 1.6. The radius of the front surface of the sixth lens is 11.051mm, the thickness is 5.3mm, and the refractive index of the fifth lens is 1.6; the radius of the front surface of the sixth lens is -12.732mm, the thickness is 1.5mm, and the refractive index of the sixth lens is 1.65. The radius of the cemented surface of the second cemented lens is 147.583mm, the thickness is 4mm, and the refractive index is 1.6. The radius of the rear surface of the seventh lens is -19.391mm, the thickness is 0.15mm, and the refractive index of the seventh lens is 1 .65; the radius of the front surface of the eighth lens is -120.245mm, the thickness is 3.0mm, the radius of the rear surface of the eighth lens is -29.593mm, the thickness is 0.15mm, and the refractive index of the eighth lens is 1.76; the radius of the front surface of the ninth lens is -385.068mm, the thickness is 3.0mm, the radius of the rear surface of the ninth lens is -50.401mm, the thickness is 28.321mm, and the refractive index of the ninth lens is 1.73. The above structure realizes an optical system of a large aperture low distortion fixed focus line scanning machine vision lens with a focal length of 28.45mm, an image side F number of 2.6, a maximum imaging surface with a resolution of up to 100lp / mm, and a maximum optical distortion of the full field of view of less than 0.12%.

[0008] Preferably, a filter and a photosensitive element are further provided behind the ninth lens.

[0009] Preferably, the first lens and the second lens are fixed lenses, and the third lens, the first cemented lens, the second cemented lens, the eighth lens and the ninth lens are a focusing group. By adjusting the relative movement of the focusing lenses such as the third lens, the first cemented lens, the second cemented lens, the seventh lens, the eighth lens and the ninth lens, a clear focus at a working distance of 200 mm to 10000 mm can be achieved, which can meet the application requirements of a wide measurement range, a large aperture and low distortion, and the light aperture can also be flexibly adjusted.

[0010] The beneficial effects of the present invention are:

[0011] 1. A large amount of light is transmitted through a structure that combines 7 lens groups. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic structural diagram of an optical imaging module of the present invention.

[0013] Figure 2 It is the MTF curve diagram of the optical imaging module of the present invention.

[0014] Figure 3 It is an optical distortion curve diagram of the optical imaging module of the present invention.

[0015] Explanation of the reference numerals: 1 - first lens, 2 - second lens, 3 - third lens, 41 - fourth lens, 42 - fifth lens, 5 - variable aperture, 61 - sixth lens, 62 - seventh lens, 7 - eighth lens, 8 - ninth lens, 9 - photosensitive member. DETAILED DESCRIPTION

[0016] The present invention is described in the form of embodiments in conjunction with the accompanying drawings to assist those skilled in the art in understanding and implementing the present invention. Unless otherwise specified, the following embodiments and the technical terms therein should not be understood without departing from the technical knowledge background of the technical field.

[0017] Embodiment 1: An optical imaging module, see Figure 1 , including a first lens 1, a second lens 2, a third lens 3, a fourth lens 41, a fifth lens 42, a variable aperture 5, a sixth lens 61, a seventh lens 62, an eighth lens 7, a ninth lens 8, a filter (not shown) and a photosensitive element 9, which are arranged in sequence along the optical axis from the object plane to the image plane.

[0018] Among them, the first lens 1 is a convex-concave spherical negative lens, the second lens 2 is a convex-concave spherical positive lens, the third lens 3 is a convex-concave spherical positive lens, the fourth lens 41 and the fifth lens 42 are glued together into a first glued lens by photosensitive adhesive, the fourth lens 41 is a double convex spherical positive lens, the fifth lens 42 is a double concave spherical negative lens, the sixth lens 61 and the seventh lens 62 are glued together into a second glued lens by photosensitive adhesive, the sixth lens 61 is a double concave spherical negative lens, the seventh lens 62 is a double convex spherical positive lens, the eighth lens 7 is a concave-convex spherical positive lens, and the ninth lens 8 is a concave-convex spherical positive lens.

[0019] In this embodiment, the first lens 1 is a low dispersion lens, Nd=1.59, Vd=36.4; the second lens 2 is a high refractive index low dispersion lens, Nd=1.75, Vd=35.0; the third lens 3 is a low dispersion lens, Nd=1.64, Vd=55.5; the fourth lens 41 is a high dispersion lens, Vd=68.3; the fifth lens 42 is a low dispersion lens, Vd=38.01; the sixth lens 61 is a low dispersion lens, Vd=38.8; the seventh lens 62 is a high dispersion lens, Vd=68.3; the eighth lens 7 is a high refractive index low dispersion lens, Nd=1.76, Vd=52.3; the ninth lens 8 is a high refractive index low dispersion lens, Nd=1.73, Vd=54.7.

[0020] In this embodiment, the first lens 1 , the second lens 2 , the third lens 3 , the fourth lens 41 , the fifth lens 42 , the sixth lens 61 , the seventh lens 62 , the eighth lens 7 and the ninth lens 8 are all made of glass lenses.

[0021] Table 1 Lens parameters of the optical imaging module of the present invention

[0022] surface Radius(mm) Thickness(mm) Refractive Index The front surface of the first lens 365.499 5.2 1.59 The first lens rear surface 33.891 21.2 Second lens front surface 46.857 7 1.75 The rear surface of the second lens 403 4.6 The front surface of the third lens 30.4714 5 1.64 The rear surface of the third lens 576 0.15 Front surface of the first cemented lens 18.182 7 1.6 First cemented lens cemented surface -58.814 2 1.6 The rear surface of the first cemented lens 11.051 5.3 1.6 Front surface of the second cemented lens -12.732 1.5 1.65 Second cemented lens cementation surface 147.583 4 1.6 The rear surface of the second cemented lens -19.391 0.15 1.65 Eighth lens front surface -120.245 3 1.76 The rear surface of the eighth lens -29.593 0.15 Ninth lens front surface -385.068 3 1.73 The ninth lens rear surface -50.401 28.321

[0023] The function of the cemented surface of the first cemented lens and the cemented surface of the second cemented lens is to correct chromatic aberration.

[0024] The above structure realizes an optical system of a large aperture, low distortion, fixed focus line scan machine vision lens with a focal length of 28.45 mm, an image side F number of 2.6, a maximum imaging surface with a resolution of up to 100lp / mm, and a maximum optical distortion of the entire field of view of less than 0.12%.

[0025] In this embodiment, the first lens and the second lens are fixed lenses, that is, the lenses are fixedly arranged, and the third lens, the first cemented lens, the second cemented lens, the eighth lens and the ninth lens are a focus group, that is, the lenses are movably arranged. By adjusting the relative movement of the focusing lenses such as the third lens, the first cemented lens, the second cemented lens, the seventh lens, the eighth lens and the ninth lens, a clear focus of a working distance of 200mm to 10000mm is achieved, which can meet the application requirements of a wide measurement range, a large aperture and low distortion, and the light aperture can also be flexibly adjusted.

[0026] The present invention is described in detail above with reference to the accompanying drawings and embodiments. It should be understood that it is impossible to describe all possible implementation methods in practice, and the inventive concept of the present invention is described as much as possible by way of example. Without departing from the inventive concept of the present invention and without creative work, the technical personnel in this technical field make selections and combinations of the technical features in the above embodiments, make experimental changes to the specific parameters, or use the prior art in this technical field to conventionally replace the disclosed technical means of the present invention to form specific embodiments, which should all belong to the implicit disclosure of the present invention.

Claims

1. An optical imaging module, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a variable aperture, a sixth lens, a seventh lens, an eighth lens and a ninth lens arranged in sequence along an optical axis from an object plane to an image plane; in, The first lens is a convex-concave spherical negative lens, the second lens is a convex-concave spherical positive lens, the third lens is a convex-concave spherical positive lens, the fourth lens and the fifth lens are glued together to form a first glued lens by photosensitive adhesive, the fourth lens is a double convex spherical positive lens, the fifth lens is a double concave spherical negative lens, the sixth lens and the seventh lens are glued together to form a second glued lens by photosensitive adhesive, the sixth lens is a double concave spherical negative lens, the seventh lens is a double convex spherical positive lens, the eighth lens is a concave-convex spherical positive lens, the ninth lens is a concave-convex spherical positive lens, the first lens is a low dispersion lens, Nd=1.59, Vd=3 6.4; the second lens is a high refractive index and low dispersion lens, Nd=1.75, Vd=35.0; the third lens is a low dispersion lens, Nd=1.64, Vd=55.5; the fourth lens is a high dispersion lens, Vd=68.3; the fifth lens is a low dispersion lens, Vd=38.01; the sixth lens is a low dispersion lens, Vd=38.8; the seventh lens is a high dispersion lens, Vd=68.3; the eighth lens is a high refractive index and low dispersion lens, Nd=1.76, Vd=52.3; the ninth lens is a high refractive index and low dispersion lens, Nd=1.73, Vd=54.

7.

2. The optical imaging module according to claim 1, wherein: The radius of the front surface of the first lens is 365.499 mm, the thickness is 5.2 mm, the radius of the rear surface of the first lens is 33.891 mm, the thickness is 21.2 mm, and the refractive index of the first lens is 1.59; the radius of the front surface of the second lens is 46.857 mm, the thickness is 7.0 mm, the radius of the rear surface of the second lens is 403.000 mm, the thickness is 4.6 mm, and the refractive index of the second lens is 1.75; the radius of the front surface of the third lens is 46.857 mm, the thickness is 7.0 mm, the radius of the rear surface of the second lens is 403.000 mm, the thickness is 4.6 mm, and the refractive index of the second lens is 1.75; The radius of the surface of the first cemented lens is 30.4714mm, the thickness is 5.0mm, the radius of the rear surface of the third lens is 576.000mm, the thickness is 0.15mm, and the refractive index of the third lens is 1.64; the radius of the front surface of the fourth lens is 18.182mm, the thickness is 7.0mm, and the refractive index of the fourth lens is 1.6, the radius of the cemented surface of the first cemented lens is -58.814mm, the thickness is 2mm, and the refractive index is 1.6, the radius of the rear surface of the fifth lens is -58.814mm, the thickness is 2mm, and the refractive index is 1.6, The radius is 11.051mm, the thickness is 5.3mm, and the refractive index of the fifth lens is 1.6; the radius of the front surface of the sixth lens is -12.732mm, the thickness is 1.5mm, and the refractive index of the sixth lens is 1.65; the radius of the cemented surface of the second cemented lens is 147.583mm, the thickness is 4mm, and the refractive index is 1.6; the radius of the rear surface of the seventh lens is -19.391mm, the thickness is 0.15mm, and the refractive index of the seventh lens is 1. 65; the radius of the front surface of the eighth lens is -120.245mm, the thickness is 3.0mm, the radius of the back surface of the eighth lens is -29.593mm, the thickness is 0.15mm, and the refractive index of the eighth lens is 1.76; the radius of the front surface of the ninth lens is -385.068mm, the thickness is 3.0mm, the radius of the back surface of the ninth lens is -50.401mm, the thickness is 28.321mm, and the refractive index of the ninth lens is 1.

73.

3. The optical imaging module according to claim 1, wherein: A filter and a photosensitive element are also provided behind the ninth lens.

4. The optical imaging module according to claim 1, wherein: The first lens and the second lens are fixed lenses, and the third lens, the first cemented lens, the second cemented lens, the eighth lens and the ninth lens form a focusing group.

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