CN115122637A - Light source of 3D printer and 3D printer - Google Patents
Light source of 3D printer and 3D printer Download PDFInfo
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- CN115122637A CN115122637A CN202210570189.2A CN202210570189A CN115122637A CN 115122637 A CN115122637 A CN 115122637A CN 202210570189 A CN202210570189 A CN 202210570189A CN 115122637 A CN115122637 A CN 115122637A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
- B29C64/264—Arrangements for irradiation
- B29C64/286—Optical filters, e.g. masks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
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Abstract
The invention discloses a light source assembly and a 3D printer, which mainly adjust the propagation angle of light rays through the arrangement of the incident surface and the emergent surface of a light-finishing piece, so that the light rays are uniformly projected to a display screen, and the uniform curing of printing resin is facilitated. The main technical scheme of the invention is as follows: a light source assembly comprising a light source assembly and a light integrator; the light-finishing piece comprises a first surface and a second surface which are opposite, wherein the first surface is a convex surface, and the second surface is a concave surface; the light source assembly is arranged opposite to the concave surface, and light rays emitted by the light source assembly are projected after passing through the light adjusting piece. The invention is mainly used for 3D printing.
Description
Technical Field
The invention relates to the technical field of 3D printing, in particular to a light source of a 3D printer and the 3D printer.
Background
In the photocuring 3D printer, place on the display screen of printer after the silo holds the resin, the light source is located the one side of display screen looks on the back in the silo, and on the light beam of light source projected the display screen, the whole display area of projection light cover display screen, and then on light passed the pattern on the display screen and projected the printing resin in the silo for print the resin according to the solidification of predetermined pattern successive layer.
The degree of consistency of projection light has direct influence to the solidification of printing resin, and even light makes printing resin homogeneous curing everywhere, helps improving the printing precision and avoids the drawing of patterns failure. However, since the light beam propagates in a beam shape, the density of the light beam in different areas of the light beam is different, which causes uneven projection light and affects the curing effect of the printing resin.
Disclosure of Invention
In view of this, the invention provides a light source of a 3D printer and a 3D printer, which adjust the propagation angle of light mainly by setting the incident surface and the exit surface of the light shaping member, so that the light is uniformly projected onto a display screen, and the uniform curing of printing resin is facilitated.
In order to achieve the purpose, the invention mainly provides the following technical scheme:
in one aspect, the present invention provides a light source of a 3D printer, including:
a light source body and a light-shaping member;
the light finishing piece comprises a first surface and a second surface which are opposite, wherein the first surface is a convex surface, and the second surface is a concave surface;
the light source body and the second surface are arranged oppositely, and light rays emitted by the light source body are projected after passing through the light-shaping piece.
The second surface comprises a first area and a second area which are adjacent, the first area is a plane, the second area surrounds the first area in a circle, and the first area is closer to a vertex of the first surface than the second area;
the first region and the second region are enclosed to form a groove, the opening contour of the groove is the same as the outer contour shape of the first region, and the opening area of the groove is larger than the area of the first region;
the light emitted by the light source body enters the light-rectifying piece from the first area and the second area respectively.
Wherein, the surface type of the second area is one or the combination of a spherical surface, an aspherical surface and a conical surface.
The second area comprises a first sub-area, a second sub-area and a third sub-area which are adjacent in sequence, the first sub-area surrounds the first area in a circle, the second sub-area surrounds the first sub-area in a circle, and the third sub-area surrounds the second sub-area in a circle;
the second sub-area is a conical surface;
the first sub-area and the third sub-area are both arc surfaces, or the first sub-area and the third sub-area are both spherical surfaces, or the first sub-area and the third sub-area are both aspheric surfaces.
Wherein, the light-adjusting piece also comprises a third surface, a fourth surface and a side elevation;
the third surface surrounds the first surface for a circle, is a plane and extends in the direction perpendicular to the optical axis of the whole optical element;
the fourth surface surrounds the second surface for a circle, is a plane and extends in the direction vertical to the optical axis of the light-rectifying part;
the third surface and the fourth surface are arranged oppositely, and the side vertical surfaces are connected with the third surface and the fourth surface respectively;
and the third surface, the fourth surface and the side vertical surface enclose a boss for fixing the finishing member.
Wherein, the vertical distance e between the vertex of the first surface and the fourth surface is more than or equal to 5 mm and less than or equal to 100 mm;
and/or the vertical distance g between the third surface and the fourth surface is more than or equal to 0.4 mm and less than or equal to 10 mm;
and/or the vertical distance f between the vertex of the second surface and the fourth surface is more than or equal to 0.01e and less than or equal to 0.6e, wherein e is the vertical distance between the vertex of the first surface and the fourth surface;
and/or the vertical distance f between the vertex of the second surface and the fourth surface is greater than the vertical distance g between the third surface and the fourth surface;
and/or the vertical distance d between the vertex of the light source body and the fourth surface is greater than or equal to 0 and less than c, the tangent plane of the vertex of the light source body is closer to the first surface than the fourth surface, and c is the distance between the vertex of the second surface and the vertex of the light source body.
The light source body comprises a fixed base plate and a light-emitting piece, the light-emitting piece is arranged on the fixed base plate, the fixed base plate and the second face enclose to form a containing cavity, and the light-emitting piece is located in the containing cavity.
The light source body also comprises a protective cover;
the protective cover is arranged outside the luminous piece and connected with the bottom plate, and the protective cover is used for protecting the luminous piece.
The distance b between the vertex of the first surface and the vertex of the light source body is greater than or equal to 5 mm and less than or equal to 100 mm;
and/or the distance c between the vertex of the second surface and the vertex of the light source body is greater than 0 and less than b, and b is the distance between the vertex of the first surface and the vertex of the light source body.
Wherein, at least one in first face and the second face is the aspheric surface, and the aspheric surface satisfies following formula:
wherein z is the rise of the aspheric surface at point (x, y),
c x curvature in x-direction of aspheric surface vertex, R x Is the x-direction curvature radius of the aspheric surface vertex, c y Curvature in the y-direction of the aspheric surface vertex, R y Is the y-direction curvature radius of the aspheric surface vertex, k x Is the aspheric coefficient of the x direction, k y Is an aspherical coefficient in the y direction, A 2n And B 2n All are aspheric high-order term coefficients or aspheric correction coefficients, and n is a positive integer greater than 1.
Wherein the second surface is an arc surface, and the curvature radius R of the second surface 0 And e is greater than or equal to 5e, and e is the vertical distance between the vertex of the first surface and the plane where the edge of the second surface is located.
The light source body comprises a fixed bottom plate and a light-emitting piece, and the light-emitting piece is arranged on the fixed bottom plate;
the light-emitting piece is a point light source which is positioned on the optical axis of the light-rectifying piece, or the vertical distance between the point light source and the optical axis is smaller than a distance threshold value;
or the light-emitting part is a surface light source, the surface light source comprises a plurality of light-emitting chips, the distance between every two adjacent light-emitting chips is smaller than a threshold value, the central light-emitting chip of the surface light source is positioned on the optical axis of the light-rectifying part, or the vertical distance between the central light-emitting chip of the surface light source and the optical axis is smaller than a distance threshold value.
The light-emitting piece is a surface light source which comprises a plurality of light-emitting chips, and the distance between every two adjacent light-emitting chips is smaller than or equal to 3 millimeters.
Wherein, the light that the light source body sent is after whole light piece refraction, throws uniformly.
In another aspect, the present invention also provides a 3D printer comprising a light source of the 3D printer as described in any one of the above, and
a gate for displaying a contoured pattern;
the light source of 3D printer sets up in gate one side, and the even projection of light that sends of 3D printer is to the gate to pass the gate with solidification printing resin.
The display outer diameter of the gate is delta, and the vertical distance a between the vertex of the first surface and the gate is greater than or equal to 0.2 delta and less than or equal to 5 delta.
According to the light source of the 3D printer and the 3D printer, the transmission angle of light is adjusted mainly through the arrangement of the incident surface and the emergent surface of the light-rectifying part, so that the light is uniformly projected onto a display screen, and the uniform curing of printing resin is facilitated. In the prior art, because light rays are transmitted in a beam shape, the density of the light rays in different areas in the light beams is different, so that the projection light is not uniform, and the curing effect of printing resin is influenced. Compared with the prior art, in this application file, the incident surface that sets up the light finishing piece is the concave surface, and the emergent face of light finishing piece is the convex surface, and the light that the light source body sent is through concave surface and convex surface refraction twice, changes the propagation angle of light, plays the effect of assembling to the sparse region of light for the even projection of refraction light is on the display screen.
Drawings
Fig. 1 is a schematic structural diagram of a light source and a display screen of a 3D printer according to an embodiment of the present invention;
fig. 2 is a schematic perspective view of a light-shaping element according to an embodiment of the present invention;
fig. 3 is a schematic perspective view of a light-shaping element at a second viewing angle according to an embodiment of the present invention;
FIG. 4 is a schematic top view of a light integrator according to an embodiment of the present invention;
FIG. 5 is a cross-sectional view of the polishing article shown in FIG. 4 at position D-D;
FIG. 6 is a cross-sectional view of the polishing article shown in FIG. 4 at position E-E;
FIG. 7 is a schematic diagram of the dimensions of a light integrator provided in accordance with an embodiment of the present invention;
FIG. 8 is a schematic structural diagram of another polishing member according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a light source body according to an embodiment of the present invention;
fig. 10 is a schematic view illustrating a positional relationship among a light source body, a light-shaping member, and a display screen according to an embodiment of the present invention;
fig. 11 is a schematic diagram of a projection of a light source of a 3D printer on a display screen according to an embodiment of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects of the light source of the 3D printer according to the present invention will be made with reference to the accompanying drawings and preferred embodiments. For convenience of description, the light emitted from the light source is described in the form of rays.
In one aspect, as shown in fig. 1 to 6, an embodiment of the present invention provides a light source for a 3D printer, including:
a light source body 100 and a light finishing member 200;
the polishing member 200 includes a first surface 210 and a second surface 220 opposite to each other, the first surface 210 is a convex surface, and the second surface 220 is a concave surface;
the light source body 100 is disposed opposite to the second surface 220, and light emitted from the light source body 100 is projected through the light-shaping member 200.
In one embodiment, the 3D printer comprises a base box body, the base box body is of a cavity structure, a gating device 300 is arranged on the base box body, a light source is located in the base box body, and a trough is arranged on one side, back to the light source, of the gating device 300. The slice data of the printing model is transmitted to the gate 300 one by the main controller, the gate 300 enables the light with a specific contour to pass through, the light emitted by the light source is projected onto the gate 300, and after passing through the gate 300, the light is projected onto the printing resin in the material groove with the specific contour, so that the printing resin is solidified according to the specific contour. For convenience of description, the light projecting mode in which the gate 300 is located at the top end of the base box and the light source projects from bottom to top is taken as an example. In addition, the gate 300 may be located at the bottom of the base housing, and the light source projects from the top to the bottom.
The light source body 100 may be in various forms, such as a Chip On Board (COB) light source, an integrated light source, a laser light source, or a mercury lamp, and the light source body 100 includes a light emitting member 120 and a fixing substrate 110, the light emitting member 120 may be a point light source or a surface light source, the surface light source includes a plurality of light emitting chips, a distance between two adjacent light emitting chips is less than a threshold value, such as 3 mm, and the light emitting member 120 is an integrated light source or a COB light source in which a maximum distance between the light emitting chips is less than or equal to 3 mm. In this embodiment, for example, the light emitting member 120 is a point light source or a surface light source with a very small pitch between light emitting chips, for example, the light source body 100 emits light through the UV lamp beads or the light emitting chips with a very small pitch. The light-shaping member 200 is disposed on one side of the light source body 100 where light is transmitted, the central light-emitting chip of the point light source or the area light source is located on the optical axis of the light-shaping member 200, or the perpendicular distance between the central light-emitting chip of the point light source or the area light source and the optical axis is less than a distance threshold, and the distance threshold may be 10mm, so that light is uniformly adjusted.
The refraction of light will take place after light passes light finishing piece 200 for the propagation angle of light changes, can change the refraction angle of the light in different regions through the face type that changes first face 210 and second face 220, adjusts light propagation direction, and then reaches the degree of consistency of the light of adjustment projection display screen. For convenience of description, the first surface 210 of the light finishing member 200 is referred to as an emergent surface, the second surface 220 is referred to as an incident surface, the light projected onto the incident surface is referred to as incident light, the light projected from the emergent surface is referred to as refracted light, and the refracted light is the projected light projected onto the display screen.
The emergent face is the convex surface, specifically can be the arcwall face, the incident face is the concave surface sunken to emergent face one side, transparent light propagation medium that the speed of light propagation is different from the air between incident face and the emergent face, take place the first refraction when light gets into light finishing member 200 by the incident face, the direction of propagation of light takes place the first change, take place the second refraction at the emergent face when light is jetted out by light finishing member, the direction of propagation of light takes place the second change, because the incident face is the concave surface, the emergent face is the convex surface, make twice refractions of light be the skew towards same direction, play the effect of assembling to light, thereby realize the intensive adjustment to the light in sparse region, make light even. For example, in an embodiment, the light emitted from the light emitting element 120 is gradually sparse from the central light to the edge of the light beam, in order to avoid the situation that the light projected onto the display screen is gradually weakened from the center outwards, the above-mentioned light shaping element 200 is disposed on the light propagation side of the light emitting element 120, and the specific surface types of the incident surface and the emergent surface are set, so as to enhance the angle change of the light near the edge of the light beam, as shown in fig. 1, the propagation angle of the central light a does not change, the propagation angle of the light B near the central light a changes slightly, the propagation angle of the light C near the edge of the light beam changes greatly, i.e., the light near the edge of the light beam is gradually enhanced to converge, so that the sparse light becomes dense light when projected onto the display screen, and the projected light approaches to uniformity.
It is understood that the refracted light in the present embodiment includes light rays traveling at various angles, for example, the refracted light still travels in an approximate beam shape, and the light rays are uniform to different degrees at different positions in the light beam due to different traveling directions of the light rays, and the position where the light rays in the refracted light beam are most uniform can be found by adjusting the distance between the light source body 100 and the gate 300, which will be described in detail below.
According to the light source of the 3D printer and the 3D printer, the transmission angle of light is adjusted mainly through the arrangement of the incident surface and the emergent surface of the light-adjusting piece, so that the light is uniformly projected to the display screen, and the uniform curing of printing resin is facilitated. In the prior art, because light rays are transmitted in a beam shape, the density of the light rays in different areas in the light beams is different, so that the projection light is not uniform, and the curing effect of printing resin is influenced. Compared with the prior art, in this application file, the incident surface that sets up the light finishing piece is the concave surface, and the emergent face of light finishing piece is the convex surface, and the light that the light source body sent is through concave surface and convex surface refraction twice, changes the propagation angle of light, plays the effect of assembling to the sparse region of light for the even projection of refraction light is on the display screen.
The surface types of the first surface 210 and the second surface 220 can be in various forms, and the incident angle of the light is adjusted by adjusting the surface types of the first surface 210 and the second surface 220, so that the propagation angle of the refracted light is adjusted, and the effect of uniform light is achieved. The surface types of the first surface 210 and the second surface 220 are related to the arrangement position of the light source body, the type of the light emitting element and the distance between the light source and the display screen, for example, the first surface 210 can be a continuous arc surface, and the second surface 220 can be a continuous arc surface or formed by mutually connecting a plurality of surface types.
In one embodiment, as shown in fig. 3 and 7, the second surface 220 includes a first region 221 and a second region 222 which are adjacent to each other, the first region 221 is a plane, the second region 222 surrounds the first region 221 in a circle, and the first region 221 is closer to the vertex of the first surface 210 than the second region 222. Light emitted from the light source body 100 enters the light finishing member 200 through the first region 221 and the second region 222, respectively.
The first region 221 is a plane, the second region 222 is an annular region with a uniform width, and the second region 222 extends from the edge of the first region 221 to a direction away from the optical axis of the light-shaping member 200 and away from the vertex of the first surface 210, so that the first region 221 and the second region 222 enclose a groove, the opening profile of the groove is the same as the outer profile of the first region 221, and the opening area of the groove is larger than the area of the first region 221. The second region 222 cooperates with the first surface 210 to perform a stronger converging function on light, so that light near the edge region of the light beam is concentrated, the second region 222 is not limited to a surface type, and the surface type of the second region 222 can be adjusted to adapt to light beams with different densities, for example, the surface type of the second region 222 can be one or a combination of a spherical surface, an aspheric surface and a conical surface, so that flexible adjustment of the angle of light incident from the second region 222 is achieved.
For example, the second region 222 includes a first sub-region 223, a second sub-region 224 and a third sub-region 225 which are adjacent to each other in sequence, the first sub-region 223 surrounds the first region 221 in a circle, the second sub-region 224 surrounds the first sub-region 223 in a circle, and the third sub-region 225 surrounds the second sub-region 224 in a circle.
In one embodiment, the first subregion 223 and the third subregion 225 are both arcuate surfaces and the second subregion 224 is a tapered surface. On one hand, the first sub-area 223 and the third sub-area 225 can be conveniently machined, on the other hand, the connecting position of the first sub-area 221 and the second sub-area 224 and the position of the second sub-area 224 close to the opening of the groove are in smooth transition, the sudden change of the density degree of light rays cannot occur, and the phenomenon that projection has an annular dark area is avoided.
The first sub-area 223 and the third sub-area 225 may be spherical or aspheric, such as an ellipsoid, and the light angle can be flexibly adjusted by adjusting aspheric coefficients.
In some other embodiments, as shown in fig. 8, the second surface 220 may also be a continuous arc concave surface, so as to achieve continuous adjustment of light, avoid the problem of abrupt change of light at the junction of multiple surface types, and to increase the pertinence to the adjustment of the light propagation angle, at least one of the first surface 210 and the second surface 220 may be an aspheric surface.
The aspheric surface refers to an arc surface with inconsistent curvature, the curvature from the vertex to the edge of the aspheric surface is continuously changed, the surface type of the aspheric surface can be represented by a high-order polynomial containing aspheric surface coefficients, and the aspheric surface can be in a rotational symmetry structure. In some embodiments, the aspheric surface is represented by the following polynomial:
wherein z is the rise of the aspheric surface at point (x, y),
c x curvature in x-direction of aspheric surface vertex, R x Is the x-direction curvature radius of the aspheric surface vertex, c y Curvature in the y-direction of the aspheric apex, R y Is the y-direction curvature radius of the aspheric surface vertex, k x Is the aspheric coefficient of x direction, k y Is aspheric coefficient in y direction, when k is x ＝k y ＝0，R x ＝R y When the arc surface is spherical, A 2n And B 2n The absolute values of A2n and B2n are in the range of 0 ≤ A2n < 1, 0 ≤ B2n < 1, and n is 2, 3, and 4 … …, and the specific parameters are adjusted according to the corresponding scene, which will not be described in detail herein.
By adjusting the curvature radius R of the aspheric surface vertex in the x direction x And the curvature radius R in the y-direction of the aspherical surface apex y X-direction aspherical surface coefficient k x And aspheric coefficient k in y direction y The aspheric surface shape is adjusted, so as to achieve the function of homogenizing light. If the surface types of the first sub-region 223 and the third sub-region 225 are adjusted so that the light does not change abruptly at the surface type interface, when the second surface 220 is an arc surface, the surface types of the first surface 210 and/or the second surface 220 are adjusted so that the light is uniform.
The curvature radius is used for describing the degree of curvature of the curved surface, and it can be understood approximately that the larger the curvature radius is, the smaller the degree of curvature of the curved surface is, the curvature radius of the aspheric surface vertex is a main parameter for determining imaging of the aspheric optical system, which affects basic properties of the aspheric surface, such as the focal length of the aspheric surface, and the optimal optical effect of the aspheric surface can be achieved by adjusting the curvature radius of the aspheric surface vertex. In one embodiment, as shown in FIG. 7, the second surface 220 is an arc surface, and the radius of curvature R of the second surface 220 0 Greater than or equal to 5e, wherein e is the vertical distance between the vertex of the first surface 210 and the plane where the edge of the second surface 220 is located, and the curvature radius R 0 Is the radius of curvature of the apex of the second face 220, and in some embodimentsThe perpendicular distance e between the vertex of the first surface 210 and the plane where the edge of the second surface 220 is located can be approximately regarded as the distance between the vertex of the first surface 210 and the central light-emitting point of the light-emitting member 120, and the curvature radius R 0 Greater than or equal to 5e, so that the degree of curvature of the second surface 220 is reduced, and the light has a sufficient incident angle on the second surface 220, thereby ensuring effective refraction of the light by the second surface 220.
In one embodiment, as shown in fig. 2-7, the light finishing member 200 further includes a third face 230, a fourth face 240, and side elevations 250. The third surface 230 surrounds the first surface 210, the third surface 230 is a plane, and the third surface 230 extends in a direction perpendicular to the optical axis of the entire optical element 200. The fourth surface 240 surrounds the second surface 220, the fourth surface 240 is a plane, and the fourth surface 240 extends in a direction perpendicular to the optical axis of the light guide 200. The third surface 230 and the fourth surface 240 are disposed to face each other, and the side surface 250 is connected to the third surface 230 and the fourth surface 240. The third face 230, the fourth face 240 and the side faces 250 enclose a boss for fixing the finishing member 200.
The boss is used for fixing the finishing member 200, and specifically, the fixing of the finishing member 200 may be performed by using a ring-shaped fixing member low-voltage third face 230, so as to avoid punching connection on the boss. The light of the light source 11 includes stray light with a large angle, the stray light can enter the boss through the second surface 220, and the stray light is blocked because the third surface 230 of the boss is covered with the annular fixing piece, so that the influence of the stray light on the projection light is avoided. In addition, in other embodiments, a light absorbing coating, such as a graphite coating, may be applied to the third face 230, the graphite coating being used to absorb stray light.
In order to reduce the light loss and enhance the universality of the light-modifying device 200, in some embodiments, as shown in fig. 7, the vertical distance e between the vertex of the first surface 210 and the fourth surface 240 is greater than or equal to 5 mm and less than or equal to 100 mm. The height of the polishing member 200 is moderate, the polishing member is easy to process, the polishing member does not occupy too much space of a base box body, and meanwhile, the second surface 220 is a concave surface, so that the polishing member 200 has enough space to process the concave surface when the e is more than or equal to 5 millimeters, and the effective refraction of the concave surface is ensured. The vertical distance g between the third surface 230 and the fourth surface 240 is greater than or equal to 0.4 mm, so that the large-angle stray light is filtered, and the connection strength of the light-adjusting part 200 is ensured to be sufficient, and g is less than or equal to 10mm, so that excessive filtering of the large-angle light rays is avoided, and the light intensity of the projected light rays is not influenced. The vertical distance f between the vertex of the second surface 220 and the fourth surface 240 is greater than or equal to 0.01e, so that a sufficient space is provided for the arrangement of the light source, and the refraction effect of the second surface 220 is ensured, and f is less than or equal to 0.6e, so that the distance between the vertex of the first surface 210 and the vertex of the second surface 220 is sufficiently large, and the first surface 210 is ensured to have a sufficient bending space, so that the light can be effectively refracted at the first surface 210. And/or, a vertical distance f between a vertex of the second surface 220 and the fourth surface 240 is greater than a vertical distance g between the third surface 230 and the fourth surface 240, taking the direction of fig. 7 as an example, the vertex of the second surface 220 is higher than the third surface 230, so as to reduce the shielding of the boss on the refracted light, so that the light adjuster 200 has a larger area for light adjustment, particularly, for a case where the second surface 220 includes the first area 221 and the second area 222, the first area 221, i.e., the planar area, is higher than the third surface 230, so that a large amount of light can pass through the area between the second area 222 and the first surface 210 and be projected onto the gate 300, thereby ensuring the uniform adjustment of the light by the lens, and ensuring the light intensity.
In one embodiment, the light source body 100 includes a fixing base plate 110 and a light emitting element 120, the light emitting element 120 is disposed on the fixing base plate 110, the fixing base plate 110 and the second surface 220 enclose a receiving cavity, and the light emitting element 120 is located in the receiving cavity.
The light emitting member 120 is located in the accommodating cavity, so that the influence of the light emitting member 120 on the projection light is avoided, and the light of the light emitting member 120 is projected onto the gate 300 through the lens assembly 200, so that the intensity of the projection light is ensured.
In one embodiment, the fixing base plate 110 is connected to the fourth surface 240, and the light emitting member 120 is positioned on the fixing base plate 110 such that the light source is approximately located at the center of the opening of the groove. In some embodiments, as shown in fig. 10, a distance b between a vertex of the first surface 210 and a vertex of the light source body 100 is greater than or equal to 5 mm and less than or equal to 100 mm, and a range of a vertical distance e between the vertex of the first surface 210 and the fourth surface 240 is the same, but since the light emitting member 120 has a certain thickness, in actual use, values of the distance a and the distance e are different, and a difference between the distance a and the distance e is the thickness of the light emitting member 120. In one embodiment, a vertical distance d between a vertex of the light source body 100 and the fourth surface 240 is greater than or equal to 0 and less than c, that is, the thickness of the light source body 100 is greater than or equal to 0 and less than c, where c is a distance between a vertex of the second surface 220 and a vertex of the light source body 100, and a distance c between a vertex of the second surface 220 and a vertex of the light source body 100 is greater than 0 and less than b, where the distance relationship makes the distance between a vertex of the light source 11 and a vertex of the second surface 220 sufficient, so that a sufficient distance is ensured for light to diffuse before entering the light rectifying member 200, and a projected light area can cover a display area of the display screen.
In one embodiment, as shown in fig. 9, the light source body 100 further includes a protective cover 130, the protective cover 130 is disposed outside the light emitting element 120 and connected to the bottom plate 110, and the protective cover 130 is used for protecting the light emitting element 120.
In some embodiments, the protection cover 130 includes a cavity having a lower opening, and the protection cover 130 covers the light emitting member 120 through the lower opening and is fixed to the bottom plate 110 such that the light emitting member 120 is located in the cavity to protect the light emitting member 120. The material of the protective cover 130 includes acryl.
It can be understood that the tangent plane of the vertex of the light source body 100 is closer to the first face 210 than the fourth face 240, so that the light source body 100 is located in the receiving cavity. When the second surface 220 includes the first region 221, the vertex of the second surface 220 refers to a center point of the first region 221, and the center point of the first region 221 is located on the optical axis of the light-adjusting member 200.
It will be appreciated that in the description of the above embodiments, the above structural arrangements and distance ranges are not independent, but are constrained to achieve adjustment of the light propagation angle, so that the projected light exhibits better uniformity. As shown in fig. 11, in which the abscissa in the coordinate system represents the position on the display screen and the ordinate represents the radiation illuminance, it can be seen that the radiation illuminance in the display area of the gate 300 is uniform, and uniform curing of the printing resin can be achieved.
On the other hand, the embodiment of the invention also provides a 3D printer, which comprises the light source of the 3D printer as well as
A gate 300, the gate 300 being used to display a pattern of a specific contour;
the light source of the 3D printer is disposed at one side of the gate 300, and light emitted from the light source of the 3D printer is projected to the gate 300 and passes through the gate 300 to cure the printing resin.
In one embodiment, the gate 300 has an outer diameter δ, and the perpendicular distance a between the vertex of the first surface 210 and the gate 300 is greater than or equal to 0.2 δ and less than or equal to 5 δ.
The outer diameter δ is shown as the diameter of the circumscribed circle of the display area of the shutter 300. The specific value of the distance a is related to the size of the light-shaping element 200 and the relative positions of the light source body 100 and the light-shaping element, and the distance between the light source body 100 and the light-shaping element 200 and the gate 300 can be adjusted to observe or evaluate the uniformity of the projected light by using a radiation illuminance measuring instrument, so as to find the position with the best projection uniformity. In the present embodiment, based on the above distance range, in order to ensure that the projection light has a sufficient projection area to cover the display area and avoid light loss caused by the light source body 100 being too far away from the gate 300, the vertical distance a between the vertex of the first surface 210 and the gate 300 is set to be greater than or equal to 0.2 δ and less than or equal to 5 δ.
In one aspect, the invention provides
1. A light source for a 3D printer, comprising:
a light source body 100 and a light finishing member 200;
the polishing member 200 includes a first surface 210 and a second surface 220 opposite to each other, the first surface 210 is a convex surface, and the second surface 220 is a concave surface;
the light source body 100 is disposed opposite to the second surface 220, and light emitted from the light source body 100 is refracted by the light-shaping member 200 and then projected.
2. The light source of the 3D printer according to claim 1, wherein the second surface 220 includes a first region 221 and a second region 222, the first region 221 is a plane, the second region 222 surrounds the first region 221 in a circle, and the first region 221 is closer to the vertex of the first surface 210 than the second region 222;
the first region 221 and the second region 222 enclose a groove, the opening contour of the groove has the same shape as the outer contour of the first region 221, and the opening area of the groove is larger than the area of the first region 221;
light emitted from the light source body 100 enters the light finishing member 200 through the first region 221 and the second region 222.
3. The light source of the 3D printer according to claim 2, the second region 222 has a surface shape of one or a combination of a spherical surface, an aspherical surface and a conical surface.
4. The light source of the 3D printer according to claim 2, the second area 222 includes a first sub area 223, a second sub area 224 and a third sub area 225, the first sub area 223 surrounds the first area 221 in a circle, the second sub area 224 surrounds the first sub area 223 in a circle, and the third sub area 225 surrounds the second sub area 224 in a circle;
the second sub-region 224 is a conical surface;
the first subregion 223 and the third subregion 225 are both arc-shaped surfaces, or the first subregion 223 and the third subregion 225 are both spherical surfaces, or the first subregion 223 and the third subregion 225 are both aspheric surfaces.
5. The light source of the 3D printer according to claim 1, the light finishing member 200 further comprises a third face 230, a fourth face 240 and a side face 250;
the third surface 230 surrounds the first surface 210 for a circle, the third surface 230 is a plane, and the third surface 230 extends in a direction perpendicular to the optical axis of the entire optical element 200;
the fourth surface 240 surrounds the second surface 220, the fourth surface 240 is a plane, and the fourth surface 240 extends in a direction perpendicular to the optical axis of the light-collimating element 200;
the third surface 230 and the fourth surface 240 are oppositely arranged, and the side vertical surface 250 is respectively connected with the third surface 230 and the fourth surface 240;
the third face 230, the fourth face 240 and the side faces 250 enclose a boss for fixing the finishing member 200.
6. According to the light source of the 3D printer in fig. 5, a vertical distance e between the vertex of the first surface 210 and the fourth surface 240 is greater than or equal to 5 mm and less than or equal to 100 mm;
and/or the vertical distance g between the third surface 230 and the fourth surface 240 is greater than or equal to 0.4 mm and less than or equal to 10 mm;
and/or the vertical distance f between the vertex of the second surface 220 and the fourth surface 240 is greater than or equal to 0.01e and less than or equal to 0.6e, wherein e is the vertical distance between the vertex of the first surface 210 and the fourth surface 240;
and/or the vertical distance f between the vertex of the second face 220 and the fourth face 240 is greater than the vertical distance g between the third face 230 and the fourth face 240.
7. According to the light source of the 3D printer described in 5, a vertical distance D between the vertex of the light source body 100 and the fourth surface 240 is greater than or equal to 0 and less than c, a tangent plane of the vertex of the light source body 100 is closer to the first surface 210 than the fourth surface 240, and c is a distance between the vertex of the second surface 220 and the vertex of the light source body 100.
8. According to the light source of the 3D printer in claim 1, the light source body 100 includes a fixed base plate 110 and a light emitting member 120, the light emitting member 120 is disposed on the fixed base plate 110, the fixed base plate 110 is connected to the fourth surface 240, the fixed base plate 110 and the second surface 220 enclose a containing cavity, and the light emitting member 120 is located in the containing cavity.
9. According to the light source of the 3D printer in claim 1, the light source body 100 further includes a protection cover 130, the protection cover 130 is disposed outside the light emitting member 120 and connected to the bottom plate 110, and the protection cover 130 is used for protecting the light emitting member 120.
10. According to the light source of the 3D printer described in 1, the distance b between the vertex of the first surface 210 and the vertex of the light source body 100 is greater than or equal to 5 mm and less than or equal to 100 mm;
and/or the distance c between the vertex of the second surface 220 and the vertex of the light source body 100 is greater than 0 and less than b, wherein b is the distance between the vertex of the first surface 210 and the vertex of the light source body 100.
11. According to the light source of the 3D printer in claim 1, at least one of the first surface 210 and the second surface 220 is an aspheric surface, and the aspheric surface satisfies the following formula:
wherein z is the rise of the aspheric surface at point (x, y),
c x curvature in x-direction of aspheric surface vertex, R x Is the x-direction curvature radius of the aspheric surface vertex, c y Curvature in the y-direction of the aspheric surface vertex, R y Is the y-direction curvature radius of the aspheric surface vertex, k x Is the aspheric coefficient of the x direction, k y Is an aspherical coefficient in the y direction, A 2n And B 2n All the coefficients are aspheric high-order term coefficients or aspheric correction coefficients, and n is a positive integer larger than 1.
12. The light source of the 3D printer according to 1, the second surface 220 is an arc surface, and the curvature radius R of the second surface 220 0 And e is greater than or equal to 5e, wherein e is the vertical distance between the vertex of the first surface 210 and the plane where the edge of the second surface 220 is located.
13. According to the light source of the 3D printer 1, the light source body 100 includes a fixed base plate 110 and a light emitting member 120, and the light emitting member 120 is disposed on the fixed base plate 110;
the light emitting member 120 is a point light source, which is located on the optical axis of the light shaping member 200, or the vertical distance between the point light source and the optical axis is smaller than the distance threshold;
alternatively, the light emitting member 120 is a surface light source, the surface light source includes a plurality of light emitting chips, a distance between two adjacent light emitting chips is smaller than a threshold, a center light emitting chip of the surface light source is located on the optical axis of the light adjusting member 200, or a perpendicular distance between the center light emitting chip of the surface light source and the optical axis is smaller than the distance threshold.
14. According to the light source of the 3D printer in claim 1, the light emitting member 120 is a surface light source, the surface light source includes a plurality of light emitting chips, and a distance between two adjacent light emitting chips is less than or equal to 3 mm.
15. According to the light source of the 3D printer described in 1, the light emitted from the light source body 100 is refracted by the light-shaping member 200 and then projected uniformly.
In another aspect, the invention provides
16. A 3D printer comprising a light source as in any one of the above-mentioned 3D printers 1-15, an
A gate 300, the gate 300 being used to display a pattern of a specific contour;
the light source of the 3D printer is arranged on one side of the gate 300, and light emitted by the light source of the 3D printer is uniformly projected to the gate 300 and passes through the gate 300 to cure the printing resin.
17. According to the 3D printer described in 16, the display outer diameter of the shutter 300 is δ, and the vertical distance a between the vertex of the first surface 210 and the shutter 300 is equal to or greater than 0.2 δ and equal to or less than 5 δ.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A light source for a 3D printer, comprising:
a light source body and a light-shaping member;
the light shaping piece comprises a first surface and a second surface which are opposite, wherein the first surface is a convex surface, and the second surface is a concave surface;
the light source body and the second surface are arranged oppositely, and light rays emitted by the light source body are projected after being refracted by the light adjusting piece.
2. The light source of the 3D printer according to claim 1,
the second surface comprises a first area and a second area, the first area is a plane, the second area surrounds the first area in a circle, and the first area is closer to the vertex of the first surface than the second area;
the first region and the second region enclose a groove, the opening contour of the groove is the same as the outer contour shape of the first region, and the opening area of the groove is larger than the area of the first region;
the light emitted by the light source body enters the light-adjusting piece from the first area and the second area respectively.
3. The light source of the 3D printer according to claim 2,
the surface shape of the second area is one or the combination of a spherical surface, an aspherical surface and a conical surface.
4. The light source of the 3D printer according to claim 2,
the second area comprises a first sub-area, a second sub-area and a third sub-area, wherein the first sub-area surrounds the first area in a circle, the second sub-area surrounds the first sub-area in a circle, and the third sub-area surrounds the second sub-area in a circle;
the second sub-area is a conical surface;
the first sub-area and the third sub-area are both arc-shaped surfaces, or the first sub-area and the third sub-area are both spherical surfaces, or the first sub-area and the third sub-area are both aspheric surfaces.
5. The light source of the 3D printer according to claim 1,
the light finishing piece also comprises a third surface, a fourth surface and a side vertical surface;
the third surface surrounds the first surface for a circle, the third surface is a plane, and the third surface extends in the direction perpendicular to the optical axis of the whole optical element;
the fourth surface surrounds the second surface for a circle, the fourth surface is a plane, and the fourth surface extends in a direction perpendicular to the optical axis of the whole optical element;
the third surface and the fourth surface are oppositely arranged, and the side vertical surface is respectively connected with the third surface and the fourth surface;
and the third surface, the fourth surface and the side vertical surface enclose a boss for fixing the finishing member.
6. The light source of the 3D printer according to claim 5,
the vertical distance e between the vertex of the first surface and the fourth surface is more than or equal to 5 mm and less than or equal to 100 mm;
and/or the vertical distance g between the third surface and the fourth surface is more than or equal to 0.4 mm and less than or equal to 10 mm;
and/or the vertical distance f between the vertex of the second surface and the fourth surface is more than or equal to 0.01e and less than or equal to 0.6e, wherein e is the vertical distance between the vertex of the first surface and the fourth surface;
and/or the vertical distance f between the vertex of the second surface and the fourth surface is larger than the vertical distance g between the third surface and the fourth surface;
and/or the vertical distance d between the vertex of the light source body and the fourth surface is greater than or equal to 0 and less than c, the tangent plane of the vertex of the light source body is closer to the first surface than the fourth surface, and c is the distance between the vertex of the second surface and the vertex of the light source body.
7. The light source of the 3D printer according to claim 1,
the light source body comprises a fixed base plate and a light-emitting piece, the light-emitting piece is arranged on the fixed base plate, the fixed base plate and the second face enclose a synthetic containing cavity, and the light-emitting piece is located in the containing cavity.
8. The light source of the 3D printer according to claim 1,
the light source body further comprises a protective cover;
the safety cover set up in the illuminating part is outside, and with the bottom plate is connected, the safety cover is used for the protection the illuminating part.
9. A 3D printer comprising a light source of a 3D printer as claimed in any one of claims 1 to 8, and
a gate for displaying a contoured pattern;
the light source of the 3D printer is arranged on one side of the gate, and light rays emitted by the light source of the 3D printer are uniformly projected to the gate and penetrate through the gate to cure printing resin.
10. The 3D printer of claim 9,
the display outer diameter of the gate is delta, and the vertical distance a between the vertex of the first surface and the gate is greater than or equal to 0.2 delta and less than or equal to 5 delta.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210570189.2A CN115122637A (en) | 2022-05-24 | 2022-05-24 | Light source of 3D printer and 3D printer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210570189.2A CN115122637A (en) | 2022-05-24 | 2022-05-24 | Light source of 3D printer and 3D printer |
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| Publication Number | Publication Date |
|---|---|
| CN115122637A true CN115122637A (en) | 2022-09-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210570189.2A Pending CN115122637A (en) | 2022-05-24 | 2022-05-24 | Light source of 3D printer and 3D printer |
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| CN (1) | CN115122637A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4282622A1 (en) * | 2022-05-24 | 2023-11-29 | Shenzhen Anycubic Technology Co., Ltd. | Light source of 3d printer, and 3d printer |
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2022
- 2022-05-24 CN CN202210570189.2A patent/CN115122637A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4282622A1 (en) * | 2022-05-24 | 2023-11-29 | Shenzhen Anycubic Technology Co., Ltd. | Light source of 3d printer, and 3d printer |
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