CN220038267U - Dodging lens applied to photo-curing printing and photo-curing printing system - Google Patents

Abstract

The utility model discloses a dodging lens applied to photo-curing printing and a photo-curing printing system. After the light irradiates the light incident surface, part of the light passes through the light incident surface, and the other part of the light is reflected; compared with the plane, the light reflected by the concave spherical surface is not directly far away from the concave spherical surface, but irradiates to other parts of the concave spherical surface, so that the light incident into the concave spherical surface can be increased, the light reflected by the invalid surface can be reduced, the effective utilization rate of the light source can be improved, and the printing efficiency of a photo-curing system can be improved. Compared with a free curved surface, the concave spherical surface is easier to process and shape, so that the processing process of the dodging lens can be simplified, and the processing efficiency is improved.

Description

Dodging lens applied to photo-curing printing and photo-curing printing system

Technical Field

The utility model relates to the technical field of photo-curing printing, in particular to a dodging lens applied to photo-curing printing and a photo-curing printing system.

Background

The photo-curing forming technology is one of the most popular and common technologies in the additive manufacturing field, and the model accuracy printed by the photo-curing 3D printer is higher, so that the photo-curing 3D printer becomes the first choice of many users, the printing accuracy is the core of the LCD photo-curing 3D printer, the current high-accuracy printing method is mainly realized by obtaining uniform parallel light to penetrate through the LCD, that is, the printing accuracy is higher as the light angle of the whole light source is smaller, and if the uniformity of the light energy projected onto the exposure screen is insufficient, the light energy of 365-405 nm received in the liquid resin box is different, so that the printing accuracy is reduced. In the related art, most of the methods adopt a mode of directly irradiating an ultraviolet LED, and the uniformity of light irradiation on an exposure screen is poor, so that the overall printing precision is poor.

Disclosure of Invention

The utility model mainly aims to provide a dodging lens applied to photo-curing printing, and aims to solve the technical problem of how to improve the printing precision of a photo-curing printing system.

In order to achieve the above objective, the dodging lens for photo-curing printing provided by the present utility model has a light incident surface and a light emergent surface, wherein the light incident surface is used for light to enter, the light emergent surface is used for light to exit, the light incident surface is a concave spherical surface, and the light emergent surface is a free-form convex curved surface.

Optionally, the radius of the virtual sphere where the light incident surface is located is set to be 70mm to 90mm.

Optionally, the dodging lens includes a light incident portion and a light emergent portion, the light incident portion is plate-shaped, the light emergent portion is connected to a plate surface of the light incident portion, the light incident surface is disposed on a surface of the light incident portion, which is away from the light emergent portion, and the light emergent surface is disposed on the light emergent portion.

Optionally, the light incident part forms a light shielding area around the light incident surface, and the light shielding area is provided with a light shielding layer;

and/or, the light-emitting part further comprises a connecting peripheral surface, one side of the connecting peripheral surface is connected with the light-entering part, the other side of the connecting peripheral surface is connected with the peripheral edge of the light-emitting surface, and the connecting peripheral surface is arranged in a plane or a concave cambered surface.

The utility model also provides a photo-curing printing system, which comprises a light source, a Fresnel lens, a printing screen and the dodging lens, wherein the dodging lens is arranged on the light emitting side of the light source, the Fresnel lens is arranged on one side of the dodging lens far away from the light source, the printing screen is arranged on one side of the Fresnel lens far away from the dodging lens, the light incident surface of the dodging lens faces towards the light source, and the light emitting surface of the dodging lens faces towards the Fresnel lens.

Optionally, the light source includes a main light source matrix, the main light source matrix includes a plurality of luminous bodies, and the plurality of luminous bodies are arranged in a matrix.

Optionally, the light source further comprises an auxiliary light source, wherein the auxiliary light source comprises two luminous bodies, and the two luminous bodies are respectively arranged on two opposite sides of the main light source matrix; or, the auxiliary light source comprises four luminous bodies, and the four luminous bodies are distributed around the main light source matrix.

Optionally, the total number of luminaries of the light source is set to 16 to 25.

Optionally, a ratio of a minimum distance between the light source and the light incident surface to a width of the light incident surface is set to 0.16 to 0.165.

Optionally, a distance between the light source and the dodging lens is set to be 5mm to 7mm;

and/or the distance between the light source and the printing screen is 115mm to 120mm;

and/or, the distance between the Fresnel lens and the printing screen is set to be 1mm to 3mm;

and/or, the focal length of the Fresnel lens is set to be 100mm to 120mm.

In the technical scheme of the dodging lens, the light emergent surface of the lens is set to be a free curved surface, so that light rays emitted out of the light emergent surface form rectangular light spots on a printing screen of a photo-curing printing system, the shape of the printing screen is adapted, and the printing efficiency is improved. The light incident surface of the lens is a concave spherical surface, and the free curved surface of the light emergent surface can be matched to ensure that the light emitted out of the lens is more uniform, so that the printing precision of the photo-curing printing system is improved. After the light irradiates the light incident surface, part of the light passes through the light incident surface, and the other part of the light is reflected; compared with the plane, the light reflected by the concave spherical surface is not directly far away from the concave spherical surface, but irradiates to other parts of the concave spherical surface, so that the light incident into the concave spherical surface can be increased, the light reflected by the invalid surface can be reduced, the effective utilization rate of the light source can be improved, and the printing efficiency of a photo-curing system can be improved. Compared with a free curved surface, the concave spherical surface is easier to process and shape, so that the processing process of the dodging lens can be simplified, and the processing efficiency is improved.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an embodiment of a dodging lens applied to photo-curing printing;

FIG. 2 is a schematic diagram of another embodiment of a dodging lens according to the present utility model;

FIG. 3 is a schematic cross-sectional view of an embodiment of a dodging lens according to the present utility model;

FIG. 4 is a schematic cross-sectional view of an embodiment of a photo-curing printing system according to the present utility model;

FIG. 5 is a schematic diagram illustrating an arrangement of an embodiment of a light source according to the present utility model;

FIG. 6 is a schematic view of another embodiment of a light source according to the present utility model;

fig. 7 is a schematic layout diagram of another embodiment of the light source in the present utility model.

Reference numerals illustrate:

reference numerals	Name of the name	Reference numerals	Name of the name	Reference numerals	Name of the name
						10	Dodging lens	11	Light incident surface	12	Light-emitting surface
13	Light incident part	14	Light emitting part	15	Shading area
						20	Light source	30	Fresnel lens	40	Printing screen
21	Main light source matrix	22	Auxiliary light source	23	Luminous body

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present utility model, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implying an indication of the number of technical features indicated. Thus, a feature defining "a first", "a second" may include at least one such feature, either explicitly or implicitly. In addition, the meaning of "and/or" as it appears throughout is meant to include three side-by-side schemes, for example, "A and/or B", including A scheme, or B scheme, or a scheme where A and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

The photo-curing forming technology is one of the most popular and common technologies in the additive manufacturing field, and the model accuracy printed by the photo-curing 3D printer is higher, so that the photo-curing 3D printer becomes the first choice of many users, the printing accuracy is the core of the LCD photo-curing 3D printer, the current high-accuracy printing method is mainly realized by obtaining uniform parallel light to penetrate through the LCD, that is, the printing accuracy is higher as the light angle of the whole light source is smaller, and if the uniformity of the light energy projected onto the exposure screen is insufficient, the light energy of 365-405 nm received in the liquid resin box is different, so that the printing accuracy is reduced. In the related art, most of the methods adopt a mode of directly irradiating an ultraviolet LED, and the uniformity of light irradiation on an exposure screen is poor, so that the overall printing precision is poor.

The utility model provides a dodging lens 10 applied to photo-curing printing and a photo-curing printing system, and aims to solve the technical problem of how to improve the printing precision of the photo-curing printing system.

In the embodiment of the present utility model, as shown in fig. 1 to 3, fig. 1 is a schematic structural diagram of an embodiment of a dodging lens 10 applied to photo-curing printing in the present utility model; fig. 2 is a schematic structural diagram of another embodiment of the dodging lens 10 according to the present utility model; fig. 3 is a schematic cross-sectional view of an embodiment of the dodging lens 10.

The dodging lens 10 applied to photo-curing printing is provided with a light incident surface 11 and a light emergent surface 12, wherein the light incident surface 11 is used for light to enter, the light emergent surface 12 is used for light to exit, the light incident surface 11 is a concave spherical surface, and the light emergent surface 12 is a free-form convex curved surface.

Fig. 4 is a schematic cross-sectional view of an embodiment of the photo-curing printing system of the present utility model. The photo-curing printing system comprises a light source 20, a Fresnel lens 30, a printing screen 40 and the dodging lens 10, wherein the dodging lens 10 is arranged on the light emitting side of the light source 20, the Fresnel lens 30 is arranged on one side, away from the light source 20, of the dodging lens 10, the printing screen 40 is arranged on one side, away from the dodging lens 10, of the Fresnel lens 30, the light incident surface 11 of the dodging lens 10 faces the light source 20, and the light emergent surface 12 of the dodging lens 10 faces the Fresnel lens 30.

In the present embodiment, the centers of the light source 20, the dodging lens 10, the fresnel lens 30, and the printing screen 40 are on the same optical axis. The light emitted from the light source 20 is projected through the dodging lens 10 and the focal length of the fresnel lens 30, and is irradiated onto the printing screen 40.

The light source 20 may be an ultraviolet light source 20, and the light homogenizing lens 10 may uniformly distribute the light passing through the fresnel lens 30. The fresnel lens 30 may collimate the light such that the light is redirected perpendicularly to the print screen 40. The printing screen 40 may be a liquid crystal display, the upper polarizing film and the lower polarizing film are disposed on both sides of the printing screen 40, the image display portion of the printing screen 40 is a selectively transparent display area, the transparent image area of the printing screen 40 is reduced in blocking ultraviolet light under irradiation of the ultraviolet light source 20, and ultraviolet light is blocked in an area where no image is displayed. The ultraviolet light of the translucent printing screen 40 constitutes an ultraviolet light image area and irradiates on the liquid photo-setting resin to set the liquid resin. The cured resin layer is driven to sink into the liquid level so that the light can continue to cure the next resin layer, and the process is repeated for a plurality of times, thereby completing the three-dimensional forming process.

In the process of irradiating the light homogenizing lens 10, part of the light directly passes through the light incident surface 11, part of the light is reflected by the light incident surface 11, and the light incident surface 11 is a concave spherical surface, so that the angle of reflection of the light is large, i.e. the reflected light is not directly far away from the light incident surface 11, but irradiates other positions of the light incident surface 11 to pass through the light incident surface 11 more. That is, the concave spherical surface can make the light pass through the light incident surface 11 more finally, so as to reduce ineffective reflection and improve the utilization rate of the light, thereby improving the overall energy utilization rate of the photo-curing printing system. The concave spherical surface is easier to process and has a lower reject ratio than the free-form surface, so that the processing cost of the dodging lens 10 can be reduced.

The light enters the light homogenizing lens 10 through the light incident surface 11 and then is emitted through the light emergent surface 12, the light emergent surface 12 is a free curved surface, the uniformity of the light beam passing through the free curved surface lens is good, rectangular light spots are formed, and the system utilization rate is high. After the rectangular light spots pass through the Fresnel lens 30, the incidence angle of the light beam becomes small, and the printing accuracy can be effectively improved. By adjusting the focal length of fresnel lens 30 or the distance from print screen 40, effective control of the angle of the beam striking print screen 40 is achieved.

Specifically, as shown in fig. 1 and 2, the light homogenizing lens 10 includes a light incident portion 13 and a light emergent portion 14, the light incident portion 13 is plate-shaped, the light emergent portion 14 is connected to a plate surface of the light incident portion 13, the light incident surface 11 is disposed on a surface of the light incident portion 13 facing away from the light emergent portion 14, and the light emergent surface 12 is disposed on the light emergent portion 14. The projection of the light emitting portion 14 onto the light entering portion 13 is located within the range of the plate surface of the light entering portion 13, and the non-light entering region of the light entering portion 13 can be used for fixed mounting. Since the light-entering portion 13 is plate-shaped, it is more convenient to process a concave spherical surface on the light-entering portion 13, so as to further reduce the processing difficulty of the dodging lens 10.

In practical application, as shown in fig. 2, the light-entering portion 13 forms a light-shielding region 15 around the light-entering surface 11, and the light-shielding region 15 is provided with a light-shielding layer. The light shielding layer can be a coating layer or a film layer, and is not limited herein, and only the light shielding layer can shield light. Since the light shielding region 15 is formed around the light incident surface 11, the light can only pass through the light homogenizing lens 10 from the light incident surface 11, so as to ensure more uniform light emitted from the light emergent surface 12.

The light-emitting portion 14 further includes a connection peripheral surface, one side of the connection peripheral surface is connected to the light-entering portion 13, the other side is connected to the peripheral edge of the light-emitting surface 12, and the connection peripheral surface is provided with a plane or a concave arc surface. Thus, the light emitted from the connection peripheral surface can be reduced, so that the light emitted into the dodging lens 10 can be more fully emitted from the light emitting surface 12 to the printing screen 40 without being emitted from the circumference of the dodging lens 10, and the effective utilization rate of the light can be improved.

The light source 20 may be a point light source 20 or a surface light source 20. Exemplary, as shown in fig. 5, fig. 5 is a schematic diagram illustrating an arrangement of an embodiment of a light source 20 according to the present utility model. The light source 20 includes a main light source matrix 21, the main light source matrix 21 includes a plurality of light emitters 23, the light emitters 23 may be LED light emitters 23, and the plurality of light emitters 23 are arranged in a matrix.

The light-emitting body 23 may be a lamp bead, or may be another light-emitting structure. It can be understood that the projection of the main light source matrix 21 on the dodging lens 10 is located within the range of the light incident surface 11, so that the light emitted by the main light source matrix 21 can be transmitted to the light incident surface 11 more. The main light source matrix 21 may be a square matrix with the same length and width, so that the projection of the main light source matrix 21 on the dodging lens 10 can be more fully spread on the light incident surface 11, thereby improving the light incident quantity. Compared with the circular arrangement of the plurality of luminous bodies 23, the luminous bodies 23 are identical in shape and size, so that the distance between the adjacent luminous bodies 23 is more consistent in matrix arrangement, and the arrangement uniformity is higher, so that the light uniformity of the emergent light homogenizing lens 10 is further improved.

Specifically, as shown in fig. 6, fig. 6 is a schematic layout diagram of another embodiment of the light source 20 in the present utility model. The light source 20 further includes an auxiliary light source 22, where the auxiliary light source 22 includes two light emitters 23, and the two light emitters 23 are respectively disposed on two opposite sides of the main light source matrix 21. The projection of the auxiliary light source 22 on the light incident surface 11 can be filled between the peripheral edge of the light incident surface 11 and the main light source matrix 21, so as to improve the light irradiation amount of the light incident surface 11 near the peripheral edge, and further improve the light emitting effect. Of course, in another embodiment, as shown in fig. 7, fig. 7 is a schematic diagram illustrating an arrangement of another embodiment of the light source 20 in the present utility model; the auxiliary light source 22 includes four light emitters 23, and the four light emitters 23 are distributed around the main light source matrix 21.

It should be noted that the primary light source matrix 21 and the secondary light source 22 are merely arranged at different positions, and there is no "primary and secondary" classification in terms of the light-emitting effect such as the light-emitting luminance.

In practical applications, the total number of the light emitters 23 of the light source 20 is set to 16 to 25. In combination with the above described embodiments of the primary light source matrix 21 and the secondary light sources 22, the total number of luminaries 23 of the light source 20 may be 16 or 25 if the light source 20 comprises only the primary light source matrix 21. If the light source 20 comprises a primary light source matrix 21 and secondary light sources 22, the total number of light emitters 23 of the light source 20 may be 18 or 20.

For example, the light emitter 23 may be configured as a light emitting chip, such as an LED chip, and the light source 20 may further include a light reflecting plate to which the light emitting chip is mounted to form a COB light source, so that the light emitting effect may be improved.

The radius of the virtual sphere where the light incident surface 11 is located is set to be 70mm to 90mm, for example, 70mm, 75mm, 80mm, 85mm or 90mm.

Illustratively, the ratio of the minimum distance L1 between the light source 20 and the light incident surface 11 to the width of the light incident surface 11 is set to 0.16 to 0.165, and may be, for example, 0.16, 0.161, 0.162, 0.163, 0.164, or 0.165.

The distance L1 between the light source 20 and the light homogenizing lens 10 is set to be 5mm to 7mm, for example, 5mm, 6mm or 7mm.

Illustratively, the distance L2 between the light source 20 and the printing screen 40 is set to 115mm to 120mm, and may be 115mm, 116mm or 117mm, 118mm, 119mm or 120mm, for example.

Illustratively, the distance between the Fresnel lens 30 and the printing screen 40 is set to 1mm to 3mm, for example, 1mm, 2mm or 3mm.

Illustratively, the focal length of the Fresnel lens 30 is set to 100mm to 120mm, and may be, for example, 100mm, 105mm, 110mm, 115mm or 120mm.

In the technical scheme of the dodging lens 10, the light emergent surface 12 of the lens is set to be a free curved surface, so that light rays emitted out of the light emergent surface 12 can form rectangular light spots on the printing screen 40 of the photo-curing printing system, the shape of the printing screen 40 is adapted, and the printing efficiency is improved. The light incident surface 11 of the lens is a concave spherical surface, and the free curved surface of the light emergent surface 12 can be matched to make the light emitted out of the lens more uniform, so as to improve the printing precision of the photo-curing printing system. After the light irradiates the light incident surface 11, part of the light passes through the light incident surface 11, and the other part of the light is reflected; compared with the plane, the light reflected by the concave spherical surface is not directly far away from the concave spherical surface, but irradiates to other parts of the concave spherical surface, so that the light incident into the concave spherical surface can be increased, the light reflected by the invalid surface can be reduced, and the effective utilization rate of the light source 20 can be improved, so that the printing efficiency of a photo-curing system can be improved. Compared with a free-form surface, the concave spherical surface is easier to process and shape, so that the processing process of the dodging lens 10 can be simplified, and the processing efficiency can be improved.

The foregoing description is only of the optional embodiments of the present utility model, and is not intended to limit the scope of the utility model, and all the equivalent structural changes made by the description of the present utility model and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims (10)

1. The dodging lens is characterized by comprising a light incident surface and a light emergent surface, wherein the light incident surface is used for light to enter, the light emergent surface is used for light to exit, the light incident surface is a concave spherical surface, and the light emergent surface is a free-form convex curved surface.

2. The dodging lens for photo-curing printing according to claim 1, wherein the radius of the virtual sphere where the light incident surface is located is set to be 70mm to 90mm.

3. The dodging lens for photo-curing printing according to claim 1, wherein the dodging lens comprises a light incident portion and a light emergent portion, the light incident portion is plate-shaped, the light emergent portion is connected to a plate surface of the light incident portion, the light incident surface is arranged on a surface of the light incident portion, which is away from the light emergent portion, and the light emergent surface is arranged on the light emergent portion.

4. The dodging lens for photo-curing printing as recited in claim 3, wherein said light entrance portion forms a light shielding region around said light entrance surface, said light shielding region being provided with a light shielding layer;

and/or, the light-emitting part further comprises a connecting peripheral surface, one side of the connecting peripheral surface is connected with the light-entering part, the other side of the connecting peripheral surface is connected with the peripheral edge of the light-emitting surface, and the connecting peripheral surface is arranged in a plane or a concave cambered surface.

5. A photo-curing printing system, comprising a light source, a fresnel lens, a printing screen and a dodging lens according to any one of claims 1 to 4, wherein the dodging lens is arranged on the light-emitting side of the light source, the fresnel lens is arranged on one side of the dodging lens away from the light source, the printing screen is arranged on one side of the fresnel lens away from the dodging lens, the light-in surface of the dodging lens faces the light source, and the light-out surface of the dodging lens faces the fresnel lens.

6. The light-curable printing system of claim 5, wherein the light source comprises a primary light source matrix comprising a plurality of light emitters, the plurality of light emitters being arranged in a matrix.

7. The light-curable printing system of claim 6, wherein the light source further comprises an auxiliary light source comprising two light emitters, the two light emitters being disposed on opposite sides of the matrix of primary light sources, respectively; or, the auxiliary light source comprises four luminous bodies, and the four luminous bodies are distributed around the main light source matrix.

8. The light-curable printing system according to claim 6 or 7, wherein the total number of light emitters of the light source is set to 16 to 25.

9. The light-curable printing system of claim 5, wherein a ratio of a minimum spacing between the light source and the light-incident surface to a width of the light-incident surface is set to 0.16 to 0.165.

10. The light-curable printing system of claim 6, wherein the light source is disposed at a spacing of 5mm to 7mm from the light homogenizing lens;

and/or the distance between the light source and the printing screen is 115mm to 120mm;

and/or, the distance between the Fresnel lens and the printing screen is set to be 1mm to 3mm;

and/or, the focal length of the Fresnel lens is set to be 100mm to 120mm.