A beam shaping lens

Abstract

The utility model provides a kind of beam shaping lens, sequentially arrange including: first lens along optical axis direction from light source to object side surface: the first light source surface of first lens is concave, and the first object side surface of first lens is convex;Second lens, the first light source surface of second lens is plane, and the first object side surface of second lens is convex;Third lens, the first light source surface and the first object side surface of third lens are all plane;Fourth lens, the first light source surface of fourth lens is convex, and the first object side surface of fourth lens is plane;Wherein, first lens is high refractive lens.The beam shaping lens provided by the utility model is placed one by one by using multiple groups of lenses according to appropriate spacing, so that light is refracted to object side surface by first lens, second lens, third lens and fourth lens in turn, the angle of light is expanded, and the uniformity of illumination after shaping is improved, so that the field of view is more clear.

Description

Technical Field

[0001] This utility model relates to the field of lens technology, and more specifically to a beam shaping lens. Background Technology

[0002] Beam shaping lenses are commonly used in medical testing instruments. By arranging and combining multiple lenses or other optical elements, a Gaussian beam is converted into a flat-top beam, thereby ensuring that the energy of the laser spot is evenly distributed.

[0003] If the light distribution is uneven during the use of a beam shaping lens, it will lead to poor visual perception and increase visual fatigue. Conversely, the better the uniformity of the light distribution, the more comfortable the visual perception, which in turn improves the overall illumination brightness in medical use and makes the field of vision clearer. Existing beam shaping lenses emit relatively dazzling light and have poor light uniformity, so a lens with higher light uniformity is needed. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in existing technologies and to solve them.

[0005] To achieve the above objectives, this utility model can be implemented through the following technical solution: a beam shaping lens, comprising, arranged sequentially along the optical axis from the light source to the object side, including:

[0006] The first lens has a concave first light source surface and a convex first object surface.

[0007] The second lens has a second light source surface that is flat and a second object surface that is convex.

[0008] The third lens has a third light source surface and a third object surface that are both planar.

[0009] The fourth lens has a convex light source surface and a flat object surface.

[0010] The first lens is a high-refractive-index lens, the second and fourth lenses have the same refractive index and are respectively disposed on both sides of the third lens, and the third lens is a planar lens.

[0011] In this embodiment of the invention, the refractive index of the first lens is between 1.7 and 1.9, while the refractive indices of the second, third, and fourth lenses are between 1.5 and 1.7.

[0012] In this embodiment of the invention, the first lens is a high-refractive-index negative lens with a refractive index of 1.9.

[0013] In this embodiment of the invention, both the second and fourth lenses are positive lenses, and both have a refractive index of 1.6.

[0014] In this embodiment of the invention, the third lens is disposed at the center of the distance between the second and fourth lenses, and the refractive index of the third lens is 1.5.

[0015] In this embodiment of the invention, the radius of curvature of the first light source surface of the first lens is -30 to -35 mm, and the radius of curvature of the first object-side surface is -10 to -15 mm; the radius of curvature of the second light source surface of the second lens is 0 mm, and the radius of curvature of the second object-side surface is -20 to -25 mm; the radius of curvature of the third light source surface of the third lens is 0 mm, and the radius of curvature of the third object-side surface is 0 mm; and the radius of curvature of the fourth light source surface of the fourth lens is 20 to -25 mm, and the radius of curvature of the fourth object-side surface is 0 mm.

[0016] In this embodiment of the invention, the radius of curvature of the first light source surface of the first lens is -31.34 mm, and the radius of curvature of the first object surface is -10.6 mm; the radius of curvature of the second light source surface of the second lens is 0 mm, and the radius of curvature of the second object surface is -20.1 mm; the radius of curvature of the third light source surface of the third lens is 0 mm, and the radius of curvature of the third object surface is 0 mm; and the radius of curvature of the fourth light source surface of the fourth lens is 20.1 mm, and the radius of curvature of the fourth object surface is 0 mm.

[0017] In this embodiment of the invention, the distance between the third lens and the second and fourth lenses is the same.

[0018] In this embodiment of the invention, the convex surfaces of the second and fourth lenses both face the third lens, the plane of the first lens faces the light source, and the plane of the fourth lens faces the object side.

[0019] In this embodiment of the invention, the first lens, the second lens, the third lens, and the fourth lens are all made of glass.

[0020] Compared with the prior art, the advantages of this application are: by using multiple sets of lenses placed one by one at appropriate intervals, light is refracted onto the object side by passing through the first lens, the second lens, the third lens and the fourth lens in sequence, thereby expanding the light angle and improving the uniformity of illumination after shaping, making the field of vision clearer. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the arrangement of multiple lens groups in the beam-shaping lens;

[0022] Figure 2This is a schematic diagram of the arrangement of multiple lens groups and the light refraction structure of the beam shaping lens.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. First lens; 11. First light source surface; 12. First object side surface; 2. Second lens; 21. Second light source surface; 22. Second object side surface; 3. Third lens; 31. Third light source surface; 32. Third object side surface; 4. Fourth lens; 41. Fourth light source surface; 42. Fourth object side surface; 5. Optical axis; 6. Object side surface; 7. Light source. Detailed Implementation

[0025] The following are specific embodiments of the present invention, and the technical solution of the present invention will be further described in conjunction with the accompanying drawings.

[0026] like Figure 1-2 As shown, a beam shaping lens, arranged sequentially from the light source 7 to the object side 6 along the optical axis 5, includes:

[0027] The first lens 1 has a concave first light source surface 11 and a convex first object surface 12.

[0028] The second lens 2 has a second light source surface 21 that is flat and a second object surface 22 that is convex.

[0029] The third lens 3, the third light source surface 31 and the third object surface 32 of the third lens 3 are both flat;

[0030] The fourth lens 4 has a convex surface 41 for its fourth light source and a flat surface 42 for its fourth object side.

[0031] Among them, the first lens 1 is a high-refractive-index lens, the second lens 2 and the fourth lens 4 have the same refractive index and are respectively set on both sides of the third lens 3, and the third lens 3 is a planar lens.

[0032] Specifically, the light source 7 can be an LED lamp or other lighting equipment. During use, the light from the LED lamp preferentially illuminates the first lens 1. The first lens 1 expands the angle of the light from the LED lamp and transmits it into the optical system. The light passes through the second lens 2 to the third lens 3, and then from the third lens 3 to the fourth lens 4. The second lens 2 and the fourth lens 4 have the same external dimensions and internal parameters and are located on the left and right sides of the third lens 3. This shapes the light beam and enhances the edge brightness to improve the uniformity of illumination after shaping. The third lens 3 is a planar lens, and the spectrum is filtered through coating. This combination of lenses improves the uniformity of illumination so that the uniformity of illumination after shaping is >99%.

[0033] As a further embodiment provided by this utility model, the refractive index of the first lens 1 is in the range of 1.7-1.9, while the refractive indexes of the second lens 2, the third lens 3, and the fourth lens 4 are in the range of 1.5-1.7, so as to reflect the refractive index ranges of the first lens 1, the second lens 2, the third lens 3, and the fourth lens 4.

[0034] As a further embodiment provided by this utility model, the first lens 1 is a high refractive index negative lens with a refractive index of 1.9. Compared with other lenses, the first lens 1 is made of high-density material. When light passes through the first lens 1, the first lens 1 expands the angle of the light into the optical system.

[0035] As a further embodiment provided by this utility model, the second lens 2 and the fourth lens 4 are both positive lenses, and the refractive index of the second lens 2 and the fourth lens 4 is 1.6. The third lens 3 is disposed at the center of the distance between the second lens 2 and the fourth lens 4, and the refractive index of the third lens 3 is 1.5. The refractive indices of the second lens 2, the third lens 3 and the fourth lens 4 are low to reduce the phenomenon of dispersion and make the optical performance more stable, thereby providing a clear visual effect.

[0036] As a further embodiment provided by this utility model, the radius of curvature of the first light source surface 11 of the first lens 1 is -30 to -35 mm, and the radius of curvature of the first object surface 12 is -10 to -15 mm; the radius of curvature of the second light source surface 21 of the second lens 2 is 0 mm, and the radius of curvature of the second object surface 22 is -20 to -25 mm; the radius of curvature of the third light source surface 31 of the third lens 3 is 0 mm, and the radius of curvature of the third object surface 32 is 0 mm; the radius of curvature of the fourth light source surface 41 of the fourth lens 4 is 20 to -25 mm, and the radius of curvature of the fourth object surface 42 is 0 mm.

[0037] As a further embodiment provided by this utility model, the radius of curvature of the first light source surface 11 of the first lens 1 is -31.34 mm, and the radius of curvature of the first object surface 12 is -10.6 mm; the radius of curvature of the second light source surface 21 of the second lens 2 is 0 mm, and the radius of curvature of the second object surface 22 is -20.1 mm; the radius of curvature of the third light source surface 31 of the third lens 3 is 0 mm, and the radius of curvature of the third object surface 32 is 0 mm; the radius of curvature of the fourth light source surface 41 of the fourth lens 4 is 20.1 mm, and the radius of curvature of the fourth object surface 42 is 0 mm.

[0038] As a further embodiment provided by this utility model, the distance between the third lens 3 and the second lens 2 and the fourth lens 4 is the same, and the distance between the second lens 2 and the third lens 3 is the same, so as to improve the refraction effect of light and make the illuminance of light more uniform.

[0039] As a further embodiment provided in this utility model, the convex surfaces of the second lens 2 and the fourth lens 4 both face the third lens 3, the plane of the first lens 1 faces the light source 7, and the plane of the fourth lens 4 faces the object side 6. The second lens 2 and the fourth lens 4 are mirror-symmetrically arranged on the left and right sides of the third lens 3 (e.g., Figure 2 As shown in the figure, when light is refracted, the light beam will be shaped when it passes through the second lens 2 and the fourth lens 4, and the brightness of the edge will be increased, thereby improving the uniformity of illumination after shaping.

[0040] As a further embodiment provided by this utility model, the first lens 1, the second lens 2, the third lens 3 and the fourth lens 4 are all made of glass. The glass material improves the hardness and wear resistance of the first lens 1, the second lens 2, the third lens 3 and the fourth lens 4, and improves their refractive stability when light is refracted.

[0041] The above-described technical solution of this utility model addresses the problem that existing technical solutions are too simplistic and provides a solution that is significantly different from existing technologies. The parts not covered in this application's technical solution are the same as or can be implemented using existing technologies, and will not be described in detail here.

[0042] The technical solutions in the above embodiments have clearly and completely described the content of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

Claims

1. A beam-shaping lens, characterized in that, Arranged sequentially from the light source to the object side along the optical axis, including: The first lens has a concave first light source surface and a convex first object surface. The second lens has a second light source surface that is flat and a second object surface that is convex. The third lens has a third light source surface and a third object surface that are both planar. The fourth lens has a convex light source surface and a flat object surface. The first lens is a high-refractive-index lens, the second and fourth lenses have the same refractive index and are respectively disposed on both sides of the third lens, and the third lens is a planar lens.

2. The beam shaping lens according to claim 1, characterized in that, The refractive index of the first lens is between 1.7 and 1.9, while the refractive indexes of the second, third, and fourth lenses are between 1.5 and 1.

7.

3. A beam-shaping lens according to claim 2, characterized in that, The first lens is a high-refractive-index negative lens with a refractive index of 1.

9.

4. A beam-shaping lens according to claim 2, characterized in that, Both the second and fourth lenses are positive lenses, and both have a refractive index of 1.

6.

5. A beam shaping lens according to claim 2, characterized in that, The third lens is disposed at the center of the distance between the second and fourth lenses, and the refractive index of the third lens is 1.

5.

6. A beam-shaping lens according to claim 1, characterized in that, The first light source surface of the first lens has a radius of curvature of -30 to -35 mm, while the first object surface has a radius of curvature of -10 to -15 mm. The second light source surface of the second lens has a radius of curvature of 0 mm, while the second object surface has a radius of curvature of -20 to -25 mm. The third light source surface of the third lens has a radius of curvature of 0 mm, while the third object surface has a radius of curvature of 0 mm. The fourth light source surface of the fourth lens has a radius of curvature of 20 to -25 mm, while the fourth object surface has a radius of curvature of 0 mm.

7. A beam-shaping lens according to claim 6, characterized in that, The first light source surface of the first lens has a radius of curvature of -31.34 mm, while the first object surface has a radius of curvature of -10.6 mm. The second light source surface of the second lens has a radius of curvature of 0 mm, while the second object surface has a radius of curvature of -20.1 mm. The third light source surface of the third lens has a radius of curvature of 0 mm, while the third object surface has a radius of curvature of 0 mm. The fourth light source surface of the fourth lens has a radius of curvature of 20.1 mm, while the fourth object surface has a radius of curvature of 0 mm.

8. A beam-shaping lens according to claim 1, characterized in that, The distance between the third lens and the second and fourth lenses is the same.

9. A beam-shaping lens according to claim 1, characterized in that, The convex surfaces of the second and fourth lenses both face the third lens, the plane of the first lens faces the light source, and the plane of the fourth lens faces the side of the object.

10. A beam shaping lens according to claim 1, characterized in that, The first lens, the second lens, the third lens, and the fourth lens are all made of glass.

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