System and method for forming nano-structures on substrates to provide predetermined physical characteristics to the substrates
A three-dimensional (3D) object printer includes a surface treatment system configured to treat layers of an object being formed by the printer with a moving ultraviolet (UV) laser. The movement of the laser is controlled with a scanning mirror system and the spot size of the laser is reduced with a focus lens having a numerical aperture in a range of about 0.5 to about 1.0.
1. A three-dimensional (3D) object printer comprising:
a platen;
a plurality of printheads, at least one printhead in the plurality of printheads being configured to eject drops of a build material toward the platen to form an object on the platen;
a plurality of actuators operatively connected to the platen, the actuators in the plurality of actuators being configured to move the platen along three orthogonal axes bidirectionally and to rotate the platen about two of the orthogonal axes bidirectionally, the two orthogonal axes about which the platen rotates being within a plane parallel to the platen;
a surface treatment module, the surface treatment module having:
a laser source;
a focus lens;
a diverging lens, the surface treatment module being configured to move the laser source to a first position at which the laser source directs a laser beam to the focus lens along a first path that does not pass through the diverging lens to form a pulsed, focused laser beam onto at least one position on a layer of the object being formed by the 3D object printer and to move the laser source to a second position at which the laser source directs the laser beam to the diverging lens along a second path that does not pass through the focus lens to broaden the laser beam and form a beam for curing a portion of the layer of the object that is larger than the at least one position that received the pulsed, focused laser beam; and
a controller operatively connected to the plurality of actuators, the plurality of printheads, and the surface treatment module, the controller being configured to operate the actuators in the plurality of actuators to move the platen along three orthogonal axes bidirectionally with two of the orthogonal axes being within the plane parallel to the platen, to operate the printheads in the plurality of printheads to eject drops of the build material toward the platen to form the object on the platen, to operate at least one of the actuators to move the laser source in the surface treatment module to the first position and operate the laser source to form the pulsed, focused laser beam on the at least one position on the layer of the object to alter a physical property of the layer at the least one position and to move the laser source in the surface treatment module to the second position to form the beam that cures the portion of the layer of the object.
2. The 3D object printer of claim 1 wherein the laser source is an ultraviolet (UV) laser source, the UV laser source being configured to produce a pulsed UV laser beam having a wavelength of about 200 nm to about 400 nm; and
the surface treatment module further comprising:
a scanning mirror system located along the first path, the scanning mirror system being configured to receive the UV laser beam from the UV laser source and direct the UV laser beam to the focus lens to form a pulsed, focused UV laser beam; and
the controller being operatively connected to the scanning mirror system, the controller being further configured to:
operate the scanning mirror system to move the pulsed, focused UV laser beam formed by the focusing lens to predetermined locations on the layer of the object being formed by the 3D object printer.
3. The 3D object printer of claim 2 wherein the scanning mirror system is a micro-electro-mechanical system (MEMS) scanning mirror system.
4. The 3D object printer of claim 2 wherein the scanning mirror system is a Galvo scanning mirror system.
5. The 3D object printer of claim 2 wherein the focus lens has a numerical aperture in a range of about 0.5 to about 1.0.
6. The 3D object printer of claim 5 , the controller being further configured to:
alter a distance between the pulsed UV laser source and the focus lens, and a pulse duration of the UV laser beam.
7. A surface treatment module for a 3D object printer comprising:
a pulsed laser source;
a focus lens;
a diverging lens;
a plurality of actuators operatively connected to the pulsed laser source; and
a controller operatively connected to the plurality of actuators and the pulsed laser source, the controller being configured to operate the actuators in the plurality of actuators and the pulsed laser source to move the pulsed laser source to a first position and operate the pulsed laser source to direct a laser beam into the focus lens along a first path that does not pass through the diverging lens to form a pulsed, focused laser beam and to move the pulsed, focused laser beam to predetermined locations over a layer of an object being produced by a 3D object printer to alter a physical property of the layer at the predetermined locations and to move the pulsed laser source to a second position and operate the pulsed laser source to direct the laser beam into the diverging lens along a second path that does not pass through the focus lens to form a beam that cures a portion of the layer of the object that is larger than any of the predetermined locations that received the pulsed, focused beam.
8. The surface treatment module of claim 7 wherein the pulsed laser source is an ultraviolet (UV) laser source, the UV laser source being configured to produce a pulsed UV laser beam having a wavelength of about 200 nm to about 400 nm; and the surface treatment module further comprises:
a scanning mirror system located along the first path, the scanning mirror system being configured to receive the pulsed UV laser beam from the UV laser source; and
the controller being operatively connected to the scanning mirror system, the controller being further configured to operate the scanning mirror system to move the focused, pulsed UV laser beam to the predetermined locations on the layer of the object being formed by the 3D object printer.
9. The surface treatment module of claim 8 wherein the scanning mirror system is a micro-electro-mechanical system (MEMS) scanning mirror system.
10. The surface treatment module of claim 8 wherein the scanning mirror system is a Galvo scanning mirror system.
11. The surface treatment module of claim 8 wherein the focus lens has a numerical aperture in a range of about 0.5 to about 1.0.
12. The surface treatment module of claim 11 , the controller being further configured to:
alter a distance between the pulsed UV laser source and the focus lens and an amount of pulse duration of the pulsed UV laser beam.