An optical lens assembly for a light-curing 3D printer

Abstract

The present invention discloses an optical lens assembly for a light-curing 3D printer, comprising a first lens and a second lens. A light source is located in front of the first lens, and the second lens is located behind the first lens. The second lens has an illumination surface located behind it. The first lens is a biconvex aspheric lens, and the second lens is a plano-convex spherical lens. The convex surface of the second lens faces the first lens, and the side of the second lens closest to the illumination surface is a flat surface. The convex surface of the first lens closest to the light source is a first convex surface, and the convex surface of the first lens closest to the second lens is a second convex surface. The first and second convex surfaces have different aspheric surfaces. The present invention utilizes a two-lens combination, resulting in high light utilization, low distortion, high peripheral luminous flux, a light output angle of less than 10°, and a uniformity of over 95%. This can greatly improve the printer's luminous flux output, significantly enhance printing accuracy, and operate at very low cost.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and in particular to an optical lens assembly for a light-curing 3D printer. Background Art

[0002] Stereolithography 3D printers utilize a high-precision additive manufacturing process. A light beam generator illuminates the photocurable resin according to the cross-section of the 3D model. After the photocurable resin solidifies and forms, it is layered and stacked to ultimately form a solid 3D model. This type of stereolithography 3D printer typically uses LED light panels, and common LED lamps have an emitting angle of approximately 60 degrees. This large emitting angle can easily lead to inconsistent light intensity on the projection screen and excessively large projection sizes, reducing the effective utilization of the light source and seriously affecting the printing effect. To improve light source utilization and uniformity of light intensity on the projection screen, reflective bowls have been used above the LED light panels to shorten the light path and increase the proportion of parallel light. However, this is costly and ineffective.

[0003] As an important component of a light-curing 3D printer, the optical path system plays a key role and affects the printing accuracy. The light beam generating component includes a light source and a lens. The light beam generated thereby passes through the light-transmitting area of ​​the LCD screen and illuminates the liquid photosensitive resin, thereby curing the liquid photosensitive resin. If the light beam passing through the LCD screen undergoes optical effects such as refraction and reflection that cause the light beam to deform, the shape of each layer of cured photosensitive resin will be different from the shape of the corresponding slice, that is, the printed target printed part will also be different from the three-dimensional model (without considering the deformation caused by the material shape), and the printing accuracy will be reduced.

[0004] Therefore, the prior art has defects and needs to be improved. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an optical lens assembly for a light-curing 3D printer with a simple structure, low cost, good optical light uniformity effect, high light utilization rate and low distortion.

[0006] The technical solution of the present invention is as follows: an optical lens assembly for a light-curing 3D printer, comprising a first lens and a second lens, wherein a light source is located in front of the first lens, the second lens is located behind the first lens, and an illumination surface is located behind the second lens, wherein the first lens, the second lens, the light source, and the illumination surface are coaxially arranged.

[0007] The first lens is a biconvex aspheric lens, the second lens is a plano-convex spherical lens, the convex surface of the second lens faces the first lens, the side of the second lens close to the lighting surface is a plane, the convex surface of the first lens close to the light source is a first convex surface, the convex surface of the first lens close to the second lens is a second convex surface, and the aspheric surfaces of the first convex surface and the second convex surface are different.

[0008] By adopting the above-mentioned technical solutions, in the optical lens assembly for the light-curing 3D printer, the distance between the right center of the first lens and the left center of the second lens is 89.5 to 90.5 mm.

[0009] By adopting the above-mentioned technical solutions, in the optical lens assembly for the light-curing 3D printer, the distance between the left center of the first lens and the center of the light source is 9.7 to 10.3 mm.

[0010] By adopting the above-mentioned technical solutions, in the optical lens assembly for the light-curing 3D printer, the distance between the right center of the second lens and the center of the illumination surface is 32 mm.

[0011] By adopting the above-mentioned technical solutions, in the optical lens assembly for the light-curing 3D printer, the center thickness of the first lens is 9.9 to 10.1 mm.

[0012] By adopting the above-mentioned technical solutions, in the optical lens assembly for the light-curing 3D printer, the diameter of the first lens is 30 to 50 mm.

[0013] Using the above technical solutions, in the optical lens assembly for the light-curing 3D printer, the aspheric surface equation of the first lens is:

[0014]

[0015] By adopting the above-mentioned technical solutions, in the optical lens assembly for the light-curing 3D printer, the spherical radius of the second lens is 163.588 mm, and the center thickness of the second lens is 27.9-28.1 mm.

[0016] By adopting the above-mentioned technical solutions, in the optical lens assembly for the light-curing 3D printer, the diameter of the second lens is 120 to 200 mm.

[0017] By adopting the above-mentioned technical solutions, the present invention adopts a combination of two lenses, which has high light utilization, low distortion, high peripheral luminous flux, a light output angle of less than 10°, and a uniformity of more than 95%. It can greatly improve the luminous flux output of the printer, greatly improve the printing accuracy, and is very low in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0019] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] like Figure 1 This embodiment provides an optical lens assembly for a light-curing 3D printer, comprising a first lens 2 and a second lens 3. A light source 1 is located in front of the first lens 2, and the second lens 3 is located behind the first lens 2. An illumination surface 4 is located behind the second lens 3. The first lens 2, the second lens 3, the light source 1, and the illumination surface 4 are coaxially arranged. The light source 1 and the illumination surface 4 are fixed components of the 3D printer. This embodiment aims to modify the optical lens assembly between the light source 1 and the illumination surface 4.

[0021] The first lens 2 is a biconvex aspheric lens, the second lens 3 is a plano-convex spherical lens, the convex surface of the second lens 3 faces the first lens 2, the side of the second lens 3 close to the lighting surface 4 is a plane, the convex surface of the first lens 2 close to the light source 1 is the first convex surface, and the convex surface of the first lens 2 close to the second lens 3 is the second convex surface, and the aspheric surfaces of the first convex surface and the second convex surface are different.

[0022] Preferably, the spacing between the optical lens groups and the distance between the optical lens groups and the light source 1 and the illumination surface 4 need to be specifically set to ensure the best light transmission effect, such as the distance between the right center of the first lens 2 and the left center of the second lens 3 is 89.5~90.5mm, the distance between the left center of the first lens and the center of the light source 1 is 9.7~10.3mm, and the distance between the right center of the second lens 3 and the center of the illumination surface 4 is 32mm.

[0023] Preferably, in order to ensure good light transmission effect of the light source 1 through the first lens 2, the center thickness of the first lens 2 is 9.9-10.1 mm, the diameter of the first lens 2 is 30-50 mm, the two curved surfaces of the first lens 2 are different, and the aspheric surface equation of the first lens 2 is:

[0024]

[0025] The corresponding values ​​in the equations of the two aspherical surfaces of the first lens 2 are shown in Table 1, where S1 is the side of the first lens 2 close to the light source 1, and S2 is the side of the first lens 2 far from the light source 1.

[0026] Table 1

[0027] R K A1 A2 A3 A4 S1 52.413 0 0 -3.565E-006 -1.089E-008 0 S2 -90.23 0 0 0 0 0

[0028] Preferably, in order to ensure good light transmission effect of the light source 1 through the second lens 3, the spherical radius of the second lens is 163.588 mm, the center thickness of the second lens is 27.9-28.1 mm, and the diameter of the second lens 3 is 120-200 mm.

[0029] By adopting the above-mentioned technical solutions, the present invention adopts a combination of two lenses, which has high light utilization, low distortion, high peripheral luminous flux, a light output angle of less than 10°, and a uniformity of more than 95%. It can greatly improve the luminous flux output of the printer, greatly improve the printing accuracy, and is very low in cost.

[0030] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An optical lens assembly for a light-curing 3D printer, characterized in that: The invention comprises a first lens and a second lens, wherein a light source is located in front of the first lens, the second lens is located behind the first lens, an illumination surface is located behind the second lens, and the first lens, the second lens, the light source and the illumination surface are coaxially arranged; The first lens is a biconvex aspheric lens, and the second lens is a plano-convex spherical lens. The convex surface of the second lens faces the first lens, and the side of the second lens close to the illumination surface is a flat surface. The convex surface of the first lens close to the light source is a first convex surface, and the convex surface of the first lens close to the second lens is a second convex surface. The aspheric surfaces of the first convex surface and the second convex surface are different. The distance between the right center of the first lens and the left center of the second lens is 89.5 to 90.5 mm; The distance between the left center of the first lens and the center of the light source is 9.7 to 10.3 mm; The distance between the right center of the second lens and the center of the illumination surface is 32 mm; The center thickness of the first lens is 9.9 to 10.1 mm; The diameter of the first lens is 30 to 50 mm; The spherical radius of the second lens is 163.588 mm, and the center thickness of the second lens is 27.9 to 28.1 mm; The diameter of the second lens is 120 to 200 mm; The aspheric surface equation of the first lens is: S1 is the side of the first lens 2 close to the light source 1, S2 is the side of the first lens 2 away from the light source 1, R of S1 is 52.413, K is 0, A1 is 0, A2 is -3.565E-006, A3 is -1.089E-008, and A4 is 0. R of S2 is -90.23, K is 0, A1 is 0, A2 is 0, A3 is 0, and A4 is 0.

Images