CN214354235U

CN214354235U - High-uniformity small-angle light source system of photocuring 3D printer

Info

Publication number: CN214354235U
Application number: CN202120172455.7U
Authority: CN
Inventors: 洪英盛; 黄伟伦; 张胜哲
Original assignee: Shenzhen Intelligent Technology Co ltd
Current assignee: Shenzhen Intelligent Technology Co ltd
Priority date: 2021-01-22
Filing date: 2021-01-22
Publication date: 2021-10-08
Anticipated expiration: 2031-01-22

Abstract

The utility model discloses a photocuring 3D printer high homogeneity low-angle light source system, including light source, free-form surface lens, fresnel lens and printing screen, free-form surface lens is located between light source and the fresnel lens, fresnel lens is located between free-form surface lens and the printing screen, the center of light source, free-form surface lens, fresnel lens and printing screen is in on same optical axis; one side of the free-form surface lens, which is close to the light source, is a plane, and one side of the free-form surface lens, which is close to the Fresnel lens, is a free-form surface. After the rectangular light spot passes through the Fresnel lens, the incident angle of the light beam is reduced, and the printing precision can be effectively improved; the combination form of the free-form surface lens and the Fresnel lens can realize effective control of the incident beam angle by adjusting the focal length or working distance of the Fresnel lens; the uniformity of the irradiation light spot is better than 90%, the utilization rate of the light source is higher than 70%, and the angle of the light beam can be adjusted by 5-20 degrees.

Description

High-uniformity small-angle light source system of photocuring 3D printer

Technical Field

The utility model relates to a 3D prints the field, what especially relate to is a photocuring 3D printer high homogeneity low-angle light source system.

Background

In the prior art, the 3D printer adopts ultraviolet irradiation photosensitive resin, and curing molding is carried out. Photosensitive resin is sensitive to the intensity of ultraviolet light during the molding process, so it is very important to obtain uniform and high-intensity ultraviolet light beams. At present, 3D printer most adopt the mode of ultraviolet LED direct irradiation on the market, have that illuminating beam divergent angle is big, the light intensity is weak, the low scheduling problem of light energy utilization rate.

Accordingly, the prior art is deficient and needs improvement.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is: the utility model provides a photocuring 3D printer high homogeneity small-angle light source system to solve above-mentioned technical problem.

The technical scheme of the utility model as follows: a high-uniformity small-angle light source system of a photocuring 3D printer comprises a light source, a free-form surface lens, a Fresnel lens and a printing screen, wherein the free-form surface lens is positioned between the light source and the Fresnel lens, the Fresnel lens is positioned between the free-form surface lens and the printing screen, and the centers of the light source, the free-form surface lens, the Fresnel lens and the printing screen are positioned on the same optical axis; one side of the free-form surface lens, which is close to the light source, is a plane, and one side of the free-form surface lens, which is close to the Fresnel lens, is a free-form surface.

Preferably, the distance between the light source and the free-form surface lens is L1, the distance between the free-form surface lens and the fresnel lens is L2, and the distance between the fresnel lens and the printing screen is L3.

Preferably, L3< (L1+ L2)/10.

Preferably, the diameter size of the light source is 1-10 mm, and the light-emitting angle of the light source is 90-120 degrees.

Preferably, the free-form surface lens further includes a tapered surface between the flat surface and the free-form surface.

Preferably, the free-form surface has a different contour in the X-direction and the Y-direction, and the free-form surface has a peak.

Preferably, the free-form surface lens has an elliptical or circular outer shape.

Preferably, the fresnel lens has a focal length F, satisfying 0.8(L1+ L2) < F <1.2(L1+ L2), and includes a flat surface facing the free-form surface lens and a tooth surface facing the printing screen.

Adopt above-mentioned each technical scheme, the utility model discloses following beneficial effect has:

1. the light beam passing through the free-form surface lens has good uniformity, rectangular light spots are formed, and the system utilization rate is high. After the rectangular light spot passes through the Fresnel lens, the incident angle of the light beam is reduced, and the printing precision can be effectively improved.

2. The free-form surface lens can use a large-area LED light source, the energy of the system can be improved, and rectangular light spots are formed.

3. The combination of the free-form surface lens and the Fresnel lens can realize effective control of the incident beam angle by adjusting the focal length or working distance of the Fresnel lens.

4. The free-form surface lens and the Fresnel lens are combined, so that splicing errors and splicing light spot traces are avoided.

5. By adopting the combination form of the free-form surface lens and the Fresnel lens, the Fresnel lens can be made large and light, and is convenient for realizing large-size illumination spots.

6. The uniformity of the irradiation light spot is better than 90%, the utilization rate of the light source is higher than 70%, the light beam angle can be adjusted to be-10 degrees, the precision of resin curing and forming can be improved, the curing time is shortened, and the yield is improved.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic diagram of a free-form lens structure according to the present invention;

fig. 3 is a schematic diagram of the optical path of the present invention;

FIG. 4 is a schematic view of the effect of the light spot condition of the present invention;

fig. 5 is a curve diagram of the light spot condition of the present invention.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1, the present embodiment provides a high-uniformity small-angle light source system for a photocuring 3D printer, which includes a light source E1, a free-form lens E2, a fresnel lens E3, and a printing screen E4, where the free-form lens E2 is located between the light source E1 and the fresnel lens E3, and the fresnel lens E3 is located between the free-form lens E2 and the printing screen E4. The centers of the light source E1, the free-form-surface lens E2, the fresnel lens E3, and the printing screen E4 are on the same optical axis. Light emitted by the light source E1 passes through the projection of the free-form lens E2 and the focal length of the fresnel lens E3, and is irradiated onto the printing screen E4, as shown in fig. 3, which is a schematic diagram of the light path projected by the light source E1.

As shown in fig. 1 and 2, the side of the free-form-surface lens E2 close to the light source E1 is a flat surface S1, and the side of the free-form-surface lens E2 close to the printing screen E4 is a free-form surface S2. The light path in fig. 3 can be ensured to appear by the structural design, so that the light meets the printing condition.

As shown in fig. 1, the distance between the light source E1 and the free-form-surface lens E2 is L1, the distance between the free-form-surface lens and the fresnel lens is L2, and the distance between the fresnel lens E3 and the printing screen is L3. L1 and L2 mainly limit the distance from the light source E1 to the free-form surface lens E2 and from the free-form surface lens E2 to the fresnel lens E3, and when 5< L2/L1<20, the flare effect is optimal, and beyond this range, the flare effect is deteriorated and the manufacturability of the free-form surface lens is deteriorated. Meanwhile, L3< (L1+ L2)/10.

As shown in FIG. 1, the diameter of the light source E1 is 1-10 mm, and the light emitting angle of the light source E1 is 90-120 deg. The diameter of the light source E1 is sized to control the power of the light source E1, with the larger the size of the light source E1, the higher the power.

As shown in fig. 2, the free-form surface lens E2 further includes a tapered surface S3, the tapered surface S3 is located between the plane S1 and the free-form surface S2, and the tapered surface S3 facilitates injection molding or die drawing.

As shown in fig. 2, the free-form surface S2 has a peak point, which is very beneficial for penetration of the light source E1, so as to form a light spot with good effect and good manufacturability.

As shown in fig. 2, the free-form surface lens E2 can be set to have different shapes according to the actual required beam divergence angle, for example, the outer shape of the free-form surface lens E2 is an ellipse or a circle.

As shown in fig. 1, the fresnel lens has a focal length F, and satisfies 0.8(L1+ L2) < F <1.2(L1+ L2), and includes a flat surface facing the free-form surface lens and a tooth surface facing the printing screen, the teeth are dense, and the number of teeth per millimeter is greater than 1.

In summary, as shown in fig. 4 and 5, according to the structure of the lighting system, the uniformity of the light spot is good, the collimation degree is high, the range of 3D printing can be adapted to be wide, and therefore the printing productivity can be greatly improved.

The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. A high-uniformity small-angle light source system of a photocuring 3D printer is characterized by comprising a light source, a free-form surface lens, a Fresnel lens and a printing screen, wherein the free-form surface lens is positioned between the light source and the Fresnel lens, the Fresnel lens is positioned between the free-form surface lens and the printing screen, and the centers of the light source, the free-form surface lens, the Fresnel lens and the printing screen are positioned on the same optical axis;

one side of the free-form surface lens, which is close to the light source, is a plane, and one side of the free-form surface lens, which is close to the Fresnel lens, is a free-form surface.

2. The high-uniformity small-angle light source system for the photocuring 3D printer as recited in claim 1, wherein the light source is spaced apart from the free-form surface lens by a distance L1, the free-form surface lens is spaced apart from the Fresnel lens by a distance L2, and the Fresnel lens is spaced apart from the printing screen by a distance L3.

3. The high-uniformity small-angle light source system of the photocuring 3D printer as recited in claim 2, wherein L3< (L1+ L2)/10.

4. The high-uniformity small-angle light source system of the photocuring 3D printer, which is characterized in that the diameter of the light source is 1-10 mm, and the light emitting angle of the light source is 90-120 degrees.

5. The high uniformity small angle light source system of claim 1, wherein the free form lens further comprises a tapered surface, the tapered surface being located between the flat surface and the free form surface.

6. The high-uniformity small-angle light source system for the photocuring 3D printer as recited in claim 1 or 5, wherein the free-form surface has a peak point.

7. The high-uniformity small-angle light source system of the photocuring 3D printer as recited in claim 6, wherein the free-form surface lens is elliptical or circular in shape.

8. The high-uniformity small-angle light source system of the photocuring 3D printer as recited in claim 2, wherein the Fresnel lens has a focal length of F, which satisfies 0.8(L1+ L2) < F <1.2(L1+ L2).

9. The high-uniformity small-angle light source system of a light-curing 3D printer according to claim 8, wherein the Fresnel lens comprises a flat surface and a tooth surface, the flat surface faces the free-form surface lens, and the tooth surface faces the printing screen.