Abstract: A 3D printing system includes a tank filled with a liquid forming material; a platform movably disposed above the tank; a lighting module including a plurality of LEDs disposed below the tank and used for providing light projecting toward the liquid forming material, and a controlling module coupled to the lighting module and configured to drive the lighting module to generate light that is focused onto a focus plane between the platform and the tank and having a certain distance with the bottom of the tank for solidifying the liquid forming material on the focus plane to form a cross-sectional layer, wherein the controlling module uses the brightness of one of the LEDs as a basis for varying that of the other LEDs, so that the liquid forming material solidified in single (scanning) procedure can have approximately the same hardness.

Abstract: A method for three-dimensional printing for forming a three-dimensional structure on a moving platform is provided. The three-dimensional structure includes a shell portion and a foamy filling portion. The method includes the following: a digital shell model of the three-dimensional structure is built. Next, the digital shell model is sliced into a plurality of cross-section information. Next, a corresponding liquid forming material is cured on the moving platform according to the cross-section information to form a plurality of shell layers. Next, foaming process is performed on the liquid forming material to form a foamy forming material. Next, the foamy forming material located within the corresponding shell layers is cured to form a plurality of foamy filling layers. Afterward, the shell layers and the foamy filling layers are alternately formed on the moving platform and stacked to form the three-dimensional structure. A three-dimensional printing apparatus adopting the method is also provided.

Abstract: A multiple light source correction apparatus and a method of use thereof are disclosed. The multiple light source correction apparatus (10) comprises a transparent thin plate (1) having a first correction pattern (12), a second correction pattern (13) and at least one third correction pattern (14). The first correction pattern (12) includes a first straight line (121) having first and second end points (1211, 1212). The second correction pattern (13) includes a second straight line (131) and two U-shaped frames (132). The second straight line (131) includes third and fourth end points (1311, 1312). The two U-shaped frame (132) is installed at externals of the third and fourth end points (1311, 1312) respectively. The third correction pattern (14) includes a third straight line (141) having fifth and sixth end points (1411, 1412). The first, second and third straight lines (121, 131, 141) are arranged parallel to each other.

Abstract: A photocuring type 3D printer (4) includes a sink (41) for containing a forming liquid (40), a glass layer (42) disposed on the sink (41), a membrane (43) disposed above the glass layer (42), an emitting unit (46) disposed below the sink (41), and a forming platform (45) arranged to immerse in the forming liquid (40) for constructing a model (5). The 3D printer (4) further includes an adjusting unit (44) disposed at one side of the sink (41). One end of the membrane (43) is connected to the adjusting unit (44), and another end of the membrane (43) is connected to the other side of the sink (41) opposite to the adjusting unit (44). The 3D printer (4) controls the adjusting unit (44) to execute homing for tightening the membrane (43) before solidifying the model (5) and controls the adjusting unit (44) to move for relaxing the membrane (43) after the model (5) is solidified, and controls the forming platform (45) to move after the membrane (43) is relaxed for peeling the model (5) from the membrane (43).

Abstract: A 3D object forming device and a method thereof are provided. The device includes a tank used for containing a liquid forming material. A light source irradiates the liquid forming material to cure a 3D object layer-by-layer on a moving platform. In the irradiation process, when a target position currently irradiated by the light source is located on a first layer next to the moving platform, the light source is maintained to an original intensity; when the target position is not located on the first layer next to the moving platform, and when it is determined that a non-cured hollow layer exists in a predetermined number of layers at one side of the target position opposite to the light source according to the slicing data, the intensity of the light source is correspondingly decreased according to the number of layers between the hollow layer and the target position.

Abstract: A 3D printing method including: obtaining a wavelength-absorptivity relationship of a liquid forming material, where the wavelength-absorptivity relationship includes absorptivity peaks of at least two corresponding wavelengths; forming a 3D object by using a 3D printing apparatus, where the 3D printing apparatus provides a first light to cure the liquid forming material layer-by-layer and stacks the same to form the 3D object, and a wavelength of the first light is one of the at least two corresponding wavelengths; and providing a second light by a post curing device to irradiate the 3D object, where the second light comprises the at least two corresponding wavelengths.

Abstract: A 3D printing system includes a tank filled with a liquid forming material; a platform movably disposed above the tank; a lighting module including a plurality of LEDs disposed below the tank and used for providing light projecting toward the liquid forming material, and a controlling module coupled to the lighting module and configured to drive the lighting module to generate light that is focused onto a focus plane between the platform and the tank and having a certain distance with the bottom of the tank for solidifying the liquid forming material on the focus plane to form a cross-sectional layer, wherein the controlling module uses the brightness of one of the LEDs as a basis for varying that of the other LEDs, so that the liquid forming material solidified in single (scanning) procedure can have approximately the same hardness.

Abstract: A 3D printing apparatus including a light source, a DMD, a projection lens and a photo sensor is provided. The light source emits a light. The DMD is disposed on a transmission path of the light, and has multiple first micromirrors and second micromirrors. The first micromirrors reflect a first part of the light to the projection lens. The projection lens projects the first part of the light to a working liquid to cure the same. The second micromirrors reflect a second part of the light to the outside of the projection lens. By monitoring intensity of the second part of the light, it is determined whether an intensity of the light is decayed. Since the photo sensor is disposed on the transmission path of the second part of the light, allocation of the photo sensor does not influence image resolution and/or image range.

Abstract: An automotive intraoral scanner applied in a mouth includes a biting piece, a track piece and at least one mobile image processing set. The biting piece is sandwiched between two rows of teeth. The track piece is installed in the biting piece and disposed corresponding to the rows of teeth, and a shape of the track piece is similar to a shape of the rows of teeth. The mobile image processing set is installed on the track piece and moved along the track piece, and the mobile image processing set is disposed corresponding to the rows of teeth. Therefore, the automotive intraoral scanner has advantages of easy operation.

Abstract: A photocuring type 3D printer (4) includes a sink (41) for containing a forming liquid (40), a glass layer (42) disposed on the sink (41), a membrane (43) disposed above the glass layer (42), an emitting unit (46) disposed below the sink (41), and a forming platform (45) arranged to immerse in the forming liquid (40) for constructing a model (5). The 3D printer (4) further includes an adjusting unit (44) disposed at one side of the sink (41). One end of the membrane (43) is connected to the adjusting unit (44), and another end of the membrane (43) is connected to the other side of the sink (41) opposite to the adjusting unit (44). The 3D printer (4) controls the adjusting unit (44) to execute homing for tightening the membrane (43) before solidifying the model (5) and controls the adjusting unit (44) to move for relaxing the membrane (43) after the model (5) is solidified, and controls the forming platform (45) to move after the membrane (43) is relaxed for peeling the model (5) from the membrane (43).

Abstract: A photocuring type 3D printer includes a sink (31) containing forming liquid (30), a membrane (312) disposed on the internal bottom of the sink (31), an emitting unit (33) disposed below the sink (31), a forming platform (32) disposed above the sink (31), and a peeling detector (34). When printing, the 3D printer (3) controls the forming platform (32) to move along a z axis to a printing height of the model (4), and controls the emitting unit (33) to emit lights. After solidifying, the 3D printer (3) controls the forming platform (32) to raise along the z axis for performing a peeling procedure, and the peeling detector (34) to continue detecting the attachment status between the model (4) and the membrane (312). When the peeling detector (34) detects the model (4) peeled from the membrane (312), the 3D printer (3) controls the forming platform (32) to stop raising.

Abstract: A 3D printer and a liquid level sensing method are provided. The 3D printer includes a tank and at least one capacitive sensing module for sensing a liquid level of the liquid forming material in the tank. The at least one capacitive sensing module includes a first electrode pair disposed beside the tank, and the first electrode pair is used for producing an electric field, where the electric field passes through the liquid forming material.

Abstract: A multiple light source correction apparatus and a method of use thereof are disclosed. The multiple light source correction apparatus (10) comprises a transparent thin plate (1) having a first correction pattern (12), a second correction pattern (13) and at least one third correction pattern (14). The first correction pattern (12) includes a first straight line (121) having first and second end points (1211, 1212). The second correction pattern (13) includes a second straight line (131) and two U-shaped frames (132). The second straight line (131) includes third and fourth end points (1311, 1312). The two U-shaped frame (132) is installed at externals of the third and fourth end points (1311, 1312) respectively. The third correction pattern (14) includes a third straight line (141) having fifth and sixth end points (1411, 1412). The first, second and third straight lines (121, 131, 141) are arranged parallel to each other.

Abstract: A 3D object forming device and a method thereof are provided. The device includes a tank used for containing a liquid forming material. A light source irradiates the liquid forming material to cure a 3D object layer-by-layer on a moving platform. In the irradiation process, when a target position currently irradiated by the light source is located on a first layer next to the moving platform, the light source is maintained to an original intensity; when the target position is not located on the first layer next to the moving platform, and when it is determined that a non-cured hollow layer exists in a predetermined number of layers at one side of the target position opposite to the light source according to the slicing data, the intensity of the light source is correspondingly decreased according to the number of layers between the hollow layer and the target position.

Abstract: An automotive intraoral scanner applied in a mouth includes a biting piece, a track piece and at least one mobile image processing set. The biting piece is sandwiched between two rows of teeth. The track piece is installed in the biting piece and disposed corresponding to the rows of teeth, and a shape of the track piece is similar to a shape of the rows of teeth. The mobile image processing set is installed on the track piece and moved along the track piece, and the mobile image processing set is disposed corresponding to the rows of teeth. Therefore, the automotive intraoral scanner has advantages of easy operation.

Abstract: A method for detecting a characteristic of a forming material and a three-dimensional printing apparatus are provided. The three-dimensional printing apparatus includes a tank filled with a liquid forming material, and the method includes the following. The tank is controlled to swing to cause a wave motion on a liquid surface of the liquid forming material. The wave motion of the liquid forming material is detected to obtain detection waveform information. The detection waveform information and sample waveform information are compared with each other to obtain a characteristic comparison result. A predefined operation is executed according to the characteristic comparison result.

Abstract: A forming device for a three-dimensional printing machine is connected to a height adjusting mechanism of the three-dimensional printing machine, and is driven by the height adjusting mechanism to move vertically. The forming device includes an universal joint, a forming platform, a coupling shaft interconnecting the universal joint and the forming platform, and a clamping mechanism. The clamping mechanism includes a clamping arm adapted to interconnect the height adjusting mechanism and the universal joint, and having first and second arm portions movable relative to each other between a locking state to tightly clamp the universal joint, and a releasing state to release the universal joint so that the forming platform is movable relative to the clamping mechanism.

Abstract: A three-dimensional printing apparatus and a printing method thereof are provided. The three-dimensional printing apparatus includes a tank, a movable platform, a light source module, and a controller. The bottom of the tank includes an irradiated area and a non-irradiated area. The movable platform is movably disposed above the tank. The light source module is disposed under the tank and only provides light to the irradiated area to irradiate a liquid-formation material. The controller controls the movable platform to move along a first axis direction, such that at least one layer object of a three-dimensional object is cured on the movable platform layer by layer. The layer object is composed of object sections. During a period of forming one layer object, the controller controls the movable platform to move on a horizontal plane, such that the object sections of the layer object are cured sequentially above the irradiated area.

Abstract: A three-dimensional (3D) printing module including a tank filled with a liquid forming material, a top cover assembled on the tank to close the tank, a modeling platform assembled to the cover, and a first tenon movably disposed in the cover is provided. The modeling platform is immersed in the liquid forming material in the tank. When the first tenon is driven along a second axis, the cover and the modeling platform are driven along a first axis to open the tank. A 3D printing apparatus is also provided.

Abstract: A three-dimensional printer includes a platform, a lifting mechanism and a carrying base, wherein the lifting mechanism includes a vertical screw, a linear sliding rail, a movable component, a stand and a pair of limiting members. The linear sliding rail is arranged with the vertical screw in parallel. One end of the movable component is disposed with an inner screw hole while the other end has a guide portion. The guide portion is vertically connected to the linear sliding rail in a slidable manner. The stand is disposed on the horizontal two sides of the movable component. The pair of limiting members is respectively sandwiched between the two sides of the movable component and the stand. One end of each limiting member is fixed to the movable component while the other end has a sliding portion. Each sliding portion abuts on the stand.