Large-view-field object plane and image plane inclined lens

Abstract

The utility model provides a large-view-field object plane and image plane inclined lens, which comprises an object plane, an image plane, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and a diaphragm, and is characterized in that the diaphragm is arranged between the third lens and the fourth lens. The edge imaging definition and brightness are ensured through the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens.

Description

Technical Field

[0001] The utility model relates to a large field of view object surface and image surface tilting lens. Background Technique

[0002] The laser triangulation ranging method mainly irradiates a measured target with a beam of laser at a certain incident angle. The laser is reflected and scattered on the target surface, and the reflected laser is converged and imaged by a lens at another angle, and the light spot is imaged on a CCD (Charge - coupled Device, photosensitive coupling component) position sensor. When the measured object moves along the laser direction, the light spot on the position sensor will move, and the displacement size corresponds to the moving distance of the measured object. Therefore, through algorithm design, the distance value between the measured object and the baseline can be calculated from the displacement distance of the light spot.

[0003] The 3D line laser profile sensor is a 3D imaging detection instrument applying the laser triangulation principle. Its characteristic is that the object surface and the image surface of the lens are tilted. It is mainly applied to automatic detection, especially suitable for on - line appearance and dimension detection of the assembly line.

[0004] However, the lenses used in the existing large field of view 3D line laser profile sensors still have many defects. For example, due to the large field of view, the clarity and brightness of the edge imaging decrease sharply, resulting in low test accuracy. Content of the Utility Model

[0005] The purpose of the utility model is to address the above - mentioned problems existing in the prior art, and propose a large field of view object surface and image surface tilting lens, which is designed for object surface and mirror surface imaging, and ensures the clarity and brightness of edge imaging through the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens.

[0006] The purpose of the utility model can be achieved by the following technical solutions: A large field of view object surface and image surface tilting lens, characterized in that it includes an object surface, an image surface, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and a diaphragm. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are sequentially arranged between the object surface and the image surface;

[0007] The first lens is a positive lens and is initially configured to compress the light rays from the object plane; the second lens is a positive lens and is configured to compress the light rays; the third lens is a negative lens and is configured to compress the light rays to the minimum aperture and comprehensively optimize the aberration generated by the front group; the fourth lens is a negative lens and is configured to adjust the difference in light brightness between the center and the edge; the fifth lens is a positive lens and optimizes the edge sharpness; the sixth lens is a negative lens and is configured to expand the light beam and increase the edge brightness; the seventh lens is a positive lens and is configured to shape the light rays of the front group according to the tilt angle of the image plane, and finally obtain an image with consistent sharpness and brightness at the center and the edge on the tilted image plane; the aperture stop is arranged between the third lens and the fourth lens;

[0008] The radius of curvature of the first surface of the first lens is 25 - 30 mm, and the radius of curvature of the second surface is 625 - 635 mm; the radius of curvature of the first surface of the second lens is 16 - 20 mm, and the radius of curvature of the second surface is -70 - -80 mm; the radius of curvature of the first surface of the third lens is 186 - 192 mm, and the radius of curvature of the second surface is -12 - -15 mm; the radius of curvature of the first surface of the fourth lens is -60 - -70 mm, and the radius of curvature of the second surface is 18 - 22 mm; the radius of curvature of the first surface of the fifth lens is 22 - 28 mm, and the radius of curvature of the second surface is -22 - -28 mm; the radius of curvature of the first surface of the sixth lens is -14 - -18 mm, and the radius of curvature of the second surface is 38 - 42 mm; the radius of curvature of the first surface of the seventh lens is 36 - 40 mm, and the radius of curvature of the second surface is -52 - -58 mm.

[0009] Further, the radius of curvature of the first surface of the first lens is 27.2 mm, and the radius of curvature of the second surface is 632.9 mm; the radius of curvature of the first surface of the second lens is 18.9 mm, and the radius of curvature of the second surface is -74.5 mm; the radius of curvature of the first surface of the third lens is 189.4 mm, and the radius of curvature of the second surface is -13.2 mm; the radius of curvature of the first surface of the fourth lens is -65.1 mm, and the radius of curvature of the second surface is 19.8 mm; the radius of curvature of the first surface of the fifth lens is 25.6 mm, and the radius of curvature of the second surface is -25.6 mm; the radius of curvature of the first surface of the sixth lens is -16.4 mm, and the radius of curvature of the second surface is 40.1 mm; the radius of curvature of the first surface of the seventh lens is 38.6 mm, and the radius of curvature of the second surface is -55.7 mm;

[0010] Further, the refractive index ranges of the first lens, the second lens, the fifth lens, and the seventh lens are between 1.7 and 1.9.

[0011] Further, the refractive indices of the first lens, the second lens, the fifth lens, and the seventh lens are 1.8.

[0012] Further, the refractive index ranges of the third lens, the fourth lens, and the sixth lens are between 1.5 and 1.7.

[0013] Further, the refractive index of the third lens is 1.7, and the refractive indices of the fourth lens and the sixth lens are 1.6.

[0014] Further, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are all made of glass material.

[0015] Compared with the prior art, the advantages of this application are as follows: For the object plane and mirror imaging design, the edge imaging clarity and brightness are ensured by the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of an object-image plane inclined towards the lens;

[0017] Figure 2 It is a schematic optical path diagram of an object-image plane inclined towards the lens;

[0018] In the figure, 1 is the first lens; 2 is the second lens; 3 is the third lens; 4 is the fourth lens; 5 is the fifth lens; 6 is the sixth lens; 7 is the seventh lens; 8 is the image plane; 9 is the object plane; 10 is the aperture stop. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention will be further described.

[0020] As Figure 1-2 shown, a large field of view object-image plane inclined lens, characterized in that it includes an object plane 9, an image plane 8, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, and an aperture stop 10. The first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, and the seventh lens 7 are sequentially arranged between the object plane 9 and the image plane 8; the first lens 1 is closest to the object plane 9. In this embodiment, both the object plane 9 and the image plane 8 are inclined lenses and have different inclination angles. The object plane 9 and the image plane 8 form an obtuse angle with respect to the optical axis or the center line of the lens, as shown by the reference numerals A and B in Figure 1 the figure.

[0021] The first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, and the seventh lens 7 are installed in a carrier (such as a lens barrel), and the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, and the seventh lens 7 are coaxial or substantially coaxial.

[0022] The first lens 1 is a positive lens and is initially configured to compress the light rays of the object plane 9; the second lens 2 is a positive lens and is configured to compress the light rays; the third lens 3 is a negative lens and is configured to compress the light rays to the minimum aperture and comprehensively optimize the aberration generated by the front group; the fourth lens 4 is a negative lens and is configured to adjust the difference in light intensity between the center and the edge; the fifth lens 5 is a positive lens and optimizes the edge sharpness; the sixth lens 6 is a negative lens and is configured to expand the light beam to increase the edge brightness; the seventh lens 7 is a positive lens and is configured to shape the light rays of the front group according to the tilt angle of the image plane 8, and finally obtain an image with consistent sharpness and brightness at the center and the edge on the tilted image plane 8; the aperture stop 10 is disposed between the third lens 3 and the fourth lens 4; the aperture stop 106 in this embodiment is made of a light-impermeable material, and a through hole is provided in the middle for light rays to pass through.

[0023] In this embodiment, a negative lens refers to a lens that is thin in the middle and thick at the edges, is concave in shape, and has a diverging effect on light, while a positive lens is a lens that is thick in the middle and thin at the periphery and has a converging effect on light.

[0024] The radius of curvature of the first surface 11 of the first lens 1 is 25 - 30 mm, and the radius of curvature of the second surface 12 is 625 - 635 mm; the radius of curvature of the first surface 21 of the second lens 2 is 16 - 20 mm, and the radius of curvature of the second surface 22 is -70 - -80 mm; the radius of curvature of the first surface 31 of the third lens 3 is 186 - 192 mm, and the radius of curvature of the second surface 32 is -12 - -15 mm; the radius of curvature of the first surface 41 of the fourth lens 4 is -60 - -70 mm, and the radius of curvature of the second surface 42 is 18 - 22 mm; the radius of curvature of the first surface 51 of the fifth lens 5 is 22 - 28 mm, and the radius of curvature of the second surface 52 is -22 - -28 mm; the radius of curvature of the first surface 61 of the sixth lens 6 is -14 - -18 mm, and the radius of curvature of the second surface 62 is 38 - 42 mm; the radius of curvature of the first surface 71 of the seventh lens 7 is 36 - 40 mm, and the radius of curvature of the second surface 72 is -52 - -58 mm. The above first surfaces are all closer to the object plane 9 relative to the second surfaces of the corresponding lenses.

[0025] Further, the radius of curvature of the first surface 11 of the first lens 1 is 27.2 mm, while the radius of curvature of the second surface 12 is 632.9 mm; the radius of curvature of the first surface 21 of the second lens 2 is 18.9 mm, while the radius of curvature of the second surface 22 is -74.5 mm; the radius of curvature of the first surface 31 of the third lens 3 is 189.4 mm, while the radius of curvature of the second surface 32 is -13.2 mm; the radius of curvature of the first surface 41 of the fourth lens 4 is -65.1 mm, while the radius of curvature of the second surface 42 is 19.8 mm; the radius of curvature of the first surface 51 of the fifth lens 5 is 25.6 mm, while the radius of curvature of the second surface 52 is -25.6 mm; the radius of curvature of the first surface 61 of the sixth lens 6 is -16.4 mm, while the radius of curvature of the second surface 62 is 40.1 mm; the radius of curvature of the first surface 71 of the seventh lens 7 is 38.6 mm, while the radius of curvature of the second surface 72 is -55.7 mm; when the radius of curvature is negative, the surface is a concave curved surface.

[0026] Further, the refractive indices of the first lens 1, the second lens 2, the fifth lens 5, and the seventh lens 7 are in the range of 1.7 - 1.9.

[0027] Further, the refractive indices of the first lens 1, the second lens 2, the fifth lens 5, and the seventh lens 7 are 1.8.

[0028] Further, the refractive indices of the third lens 3, the fourth lens 4, and the sixth lens 6 are in the range of 1.5 - 1.7.

[0029] Further, the refractive index of the third lens 3 is 1.7, and the refractive indices of the fourth lens 4 and the sixth lens 6 are 1.6.

[0030] Further, the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, and the seventh lens 7 are all made of glass material.

[0031] Regarding the above technical solution of the present invention, in view of the technical problem that the existing technical solutions are too single, a solution significantly different from the existing technology is provided. For the parts not involved in the technical solution of this application, they are the same as the existing technology or can be implemented by the existing technology, and will not be elaborated here.

[0032] The technical solutions in the above embodiments have clearly and completely described the content of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

Claims

1. A large field of view object plane and image plane tilting lens, characterized in that, It includes an object surface, an image surface, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and a diaphragm. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are sequentially arranged between the object surface and the image surface; The first lens is a positive lens and is initially configured to compress the object surface light rays; the second lens is a positive lens and is configured to compress the light rays; the third lens is a negative lens and is configured to compress the light rays to the smallest aperture and comprehensively optimize the aberration generated by the front group; the fourth lens is a negative lens and is configured to adjust the brightness difference between the center and the edge of the light rays; the fifth lens is a positive lens and is configured to optimize the edge clarity; the sixth lens is a negative lens and is configured to expand the light rays to increase the edge brightness; the seventh lens is a positive lens and is configured to shape the front group light rays according to the tilt angle of the image surface, and finally obtain an image with consistent clarity and brightness at the center and the edge on the tilted image surface; the diaphragm is arranged between the third lens and the fourth lens; The radius of curvature of the first surface of the first lens is 25 - 30 mm, and the radius of curvature of the second surface is 625 - 635 mm; the radius of curvature of the first surface of the second lens is 16 - 20 mm, and the radius of curvature of the second surface is -70 - 80 mm; the radius of curvature of the first surface of the third lens is 186 - 192 mm, and the radius of curvature of the second surface is -12 - 15 mm; the radius of curvature of the first surface of the fourth lens is -60 - 70 mm, and the radius of curvature of the second surface is 18 - 22 mm; the radius of curvature of the first surface of the fifth lens is 22 - 28 mm, and the radius of curvature of the second surface is -22 - 28 mm; the radius of curvature of the first surface of the sixth lens is -14 - 18 mm, and the radius of curvature of the second surface is 38 - 42 mm; the radius of curvature of the first surface of the seventh lens is 36 - 40 mm, and the radius of curvature of the second surface is -52 - 58 mm.

2. The large field-of-view object plane and image plane tilted lens according to claim 1, characterized in that: The radius of curvature of the first surface of the first lens is 27.2 mm, and the radius of curvature of the second surface is 632.9 mm; the radius of curvature of the first surface of the second lens is 18.9 mm, and the radius of curvature of the second surface is -74.5 mm; the radius of curvature of the first surface of the third lens is 189.4 mm, and the radius of curvature of the second surface is -13.2 mm; the radius of curvature of the first surface of the fourth lens is -65.1 mm, and the radius of curvature of the second surface is 19.8 mm; the radius of curvature of the first surface of the fifth lens is 25.6 mm, and the radius of curvature of the second surface is -25.6 mm; the radius of curvature of the first surface of the sixth lens is -16.4 mm, and the radius of curvature of the second surface is 40.1 mm; the radius of curvature of the first surface of the seventh lens is 38.6 mm, and the radius of curvature of the second surface is -55.7 mm.

3. A large field of view object plane and image plane tilted lens according to claim 1, characterized in that: The refractive index ranges of the first lens, the second lens, the fifth lens and the seventh lens are between 1.7 and 1.

9.

4. A large field of view object plane and image plane tilted lens according to claim 2, characterized in that: The refractive indices of the first lens, the second lens, the fifth lens, and the seventh lens are 1.

8.

5. A large field of view object plane and image plane tilted lens according to claim 1, characterized in that, The refractive indices of the third lens, the fourth lens, and the sixth lens are in the range of 1.5 - 1.

7.

6. A large field of view object plane and image plane tilted lens according to claim 4, characterized in that, The refractive index of the third lens is 1.7, and the refractive indices of the fourth lens and the sixth lens are 1.

6.

7. A large field of view object plane and image plane tilted lens according to claim 1, characterized in that, The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are all made of glass.

Images