Abstract: A driving circuit for light-emitting diodes includes a power unit providing an input voltage, a voltage regulation unit providing a voltage-increasing loop and a voltage-decreasing loop and having an energy-storing capacitor with an intermediate voltage therebetween, a current control unit generating a driving current for the light-emitting diodes according to the intermediate voltage, and a switching control unit. The switching control unit generates a reference voltage based on the input voltage and compares the reference voltage with a feedback voltage associated with driving current. The switching control unit controls the voltage regulation unit to increase the intermediate voltage through the voltage-increasing loop when the feedback voltage is smaller than the reference voltage. The switching control unit controls the voltage regulation unit to decrease the intermediate voltage through the voltage-decreasing loop when the feedback voltage is larger than the reference voltage.

Abstract: A 3D printer (1, 1a) includes a material rack (20, 20a). The material rack (20, 20a) includes a positioning plate (21) and a plurality of partition members (22). The partition members (22) are fixed to a door plate (12, 12a) and disposed in an inner area (120). The inner area (120) includes a plurality of material receiving compartments (121). A material tube (2) includes a pair of wings (3). The partition members (22) include positioning recesses (220) correspondingly. The material tube (2) is positioned by disposing the wings (3) on the positioning recesses (220) in a spanning manner. The material tube (2) is driven by a printing module (40, 40a) to move out of the material receiving compartment (121) and be positioned on the printing module (40, 40a).

Abstract: A three-dimensional printing apparatus including a swing tank containing a liquid formation material, a swing mechanism, an elevating platform, a light source and a control unit is provided. The swing tank includes a pivot side and a swing side adapted to be swung about the pivot side. The swing mechanism includes a cam and a driving motor. The cam leans against the swing side for swinging the same. The elevating platform and the light source are respectively disposed above and below the swing tank. The control unit controls the elevating platform to immerge into the liquid formation material. The light source cures the liquid formation material between the elevating platform and the bottom of the swing tank. The control unit then controls the swing mechanism to swing the swing side, so the cured liquid formation material is separated from the bottom and located on the elevating platform.

Abstract: A three dimensional printing apparatus including a base, a tank, a modeling platform, and a plurality of floating units is provided. A liquid forming material is filled in the tank. Each of the floating units connects between the base and the tank, such that the tank is disposed on the base in floating manner. The modeling platform is movably immersed in the liquid forming material. A three dimensional object is formed and adhered between the modeling platform and a bottom of the tank. The modeling platform drives and tilts the tank to move out of the base by the three dimensional object, such that the three dimensional object is released from the bottom of the tank by gravity.

Abstract: A three-dimensional printing apparatus including a tank, a moving platform, a light source disposed below the tank, a detecting unit and a control unit is provided. The tank is filled with a liquid forming material and a separating liquid, wherein the specific density of the separating liquid is larger than the specific density of the liquid forming material, so that the separating liquid sinks between the tank and the liquid forming material. The control unit controls an initial depth at which the moving platform immerses into the liquid forming material, so as to form a three-dimensional object. A three-dimensional printing apparatus is also provided, wherein the light source thereof is disposed above the tank, and the specific density of the liquid forming material is larger than the specific density of the separating liquid, so that the liquid forming material sinks between the tank and the separating liquid.

Abstract: A three dimensional printing apparatus including a tank, a modeling platform, a first optical element, a second optical element, and a light source is provided. The modeling platform is movably disposed above the tank so as to move in or out the tank. The first and the second optical elements are respectively disposed next to the tank, wherein the second optical element is located above the first optical element. The light source is located below the tank. After a three dimensional object is formed on the modeling platform, the three dimensional object is moved out of the tank by the modeling platform. A first light generated by the light source is sequentially transmitted by the first and the second optical elements and detour round tank to irradiate the three dimensional object.

Abstract: A material level detecting mechanism of three-dimensional system includes a bracket, a printing head, first piston, a second piston, a first detecting unit and a second detecting unit. The bracket includes an aligner holder and a supporter. The printing head detachably located in the aligner holder, and including a nozzle with an outlet for extruding the modeling material. The first piston includes a piston rod attached to a piston head, and the second piston slidably located inside the cartridge is adapted to be pushed by the first piston toward the direction of the outlet. The first detecting unit is adapted to detect the home position of the first piston and the second detecting unit is adapted to detect the touching of the first piston and the second piston which provide the initial amount of material present in the cartridge which is subject to print.

Abstract: A printing head module includes a bracket, a plurality of printing heads, a pivot shaft, a wiper unit, and a control unit. The bracket includes a plurality of through holes. The printing heads are parallelly aligned with each other, each of the printing heads a nozzle for extruding the modeling material. The pivot shaft connected to the bracket is adapted to rotate the printing heads to a target position. The wiper unit includes a holder, a plurality of wipers, and a wiper opener. The holder is connected to the pivot shaft to be rotated with the bracket and the printing heads. The wipers rotatably connected to the holder and disposed correspondingly to the openings. The wiper opener is disposed at the target position to interfere with the wiper rotated to the target position, so as to drive the corresponding wiper to rotate to the opening position.

Abstract: A three-dimensional printing apparatus including a tank filled with a liquid-state forming material, a platform disposed at the tank, a rotating shaft, a rotating arm, and at least one light source is provided. The rotating shaft is disposed under the tank or above the tank. The rotating arm connects to the rotating shaft such that the rotating arm is driven by the rotating shaft to rotate. The light source disposed on the rotating arm rotates along with the rotating arm and generates light projecting toward the forming material along with the part of the platform moving in the forming material, such that the forming material is solidified in layers and forms a three-dimensional object on the platform.

Abstract: A printing head module includes a bracket, a locking mechanism disposed on the bracket and a printing head. The bracket includes a containing cavity and a supporter. The locking mechanism includes a pressing component fixed to the supporter, a locking component and an elastic component. The locking component pivoted to the pressing component such that the elastic component leans therebetween. The locking component has a first positioning portion. The printing head detachably disposed in the containing cavity includes a second positioning component. The first positioning portion is engaged with the second positioning component, so the elastic component is pressed to provide the locking component a restoring force away from the pressing component to confine the printing head between the locking component and the bracket.

Abstract: A three-dimensional (3-D) printing apparatus includes a base, a printing head module and a control unit. The base includes a carrying surface and a guiding mechanism. The guiding mechanism extends along a long-axis direction of the base. The printing head module movably disposed on the guiding mechanism. The length of the base is greater than the length of the printing head module, such that the printing head module is suitable for moving relatively to the guiding mechanism. The control unit coupled to the base and the printing head module controls the printing head module to move relatively to the base according to extensional information of the digital 3-D model along the long-axis direction, such that the printing head module dispenses a material on the carrying surface to form a 3-D object when moving relatively to the base.

Abstract: A printing head module includes a driving gear, a bi-directional motor, a first feeding module and a second feeding module. The bi-directional motor selectively drives the driving gear to rotate along a first direction and a second direction. The first feeding module disposed at a first side of the driving gear includes a first unidirectional gear and a first idler gear. The driving gear is engaged with the first unidirectional gear, and the first unidirectional gear unidirectionally drives the first idler gear to rotate. The second feeding module is disposed at a second side of the driving gear opposite to the first side, and includes a second unidirectional gear and a second idler gear, the driving gear is engaged with the second unidirectional gear to drive the second unidirectional gear to rotate, and the second unidirectional gear unidirectionally drive the second idler gear to rotate.

Abstract: A lamp includes a first housing, a second housing, a bulb base and a positioning part. The first housing has a first sidewall and a second sidewall. The first sidewall is perpendicularly connected to the second sidewall and has a first surface and a first assembling tank penetrating through the first surface. The second sidewall has a first cave. The second housing is detachably assembled to the first housing and has a second cave. These two caves form a first opening. The bulb base is embedded into the first opening. The bulb base has a base opening and multiple slots. The slots are disposed on an inner sidewall of the base opening along a circular direction. The positioning part is disposed in the first assembling tank and suitable to move along a normal direction of the first surface. The positioning part has a first push button and a latch hook.

Abstract: A three dimensional printing apparatus and method for detecting printing anomaly are provided. The method is adapted to the three dimensional printing apparatus including an image sensor module and a movable platform. The three dimensional printing apparatus forms a plurality of layer objects on the movable platform according to three dimensional model information so as to build a three dimensional object including the layer objects. The method for detecting printing anomaly includes following steps. At least one object image is captured according to at least one view angle by using the image sensor module. At least one checking image associated with the layer objects is obtained according to the three dimensional model information and the view angle. Whether the object image and the checking image are matched to each other or not is determined through comparing the object image and the checking image.

Abstract: A three dimensional printing apparatus including a base, a tank, a modeling platform, and a plurality of floating units is provided. A liquid forming material is filled in the tank. Each of the floating units connects between the base and the tank, such that the tank is disposed on the base in floating manner. The modeling platform is movably immersed in the liquid forming material. A three dimensional object is formed and adhered between the modeling platform and a bottom of the tank. The modeling platform drives and tilts the tank to move out of the base by the three dimensional object, such that the three dimensional object is released from the bottom of the tank by gravity.

Abstract: A 3-D printing apparatus is configured to make a modeling material form a 3-D object layer by layer. The 3-D printing apparatus includes a printing assembly and a cleaning unit. The printing assembly includes a feeding tube, a nozzle and a driving wheel set disposed between the feeding tube and the nozzle to drive the modeling material transferred to the nozzle from the feeding tube and then exiting from the printing assembly via the nozzle so as to form a 3-D object layer by layer. The cleaning unit has a brush, in which the brush leans against on the driving wheel set to clean out the residual modeling material while the driving wheel set rotates relatively to the cleaning unit.

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.