Abstract:
The present invention provides a complex including carbon nanotubes (CNT) and polyimide (PI), and a method for producing the same. The CNT-PI complex possesses good electromagnetic shielding effectiveness. The CNT-PI complex primarily includes polyimide and carbon nanotubes dispersed in the polyimide. The method for producing the CNT-PI complex first disperses carbon nanotubes in a solvent by adding a dispersant and using an ultrasonic oscillator. Then the carbon nanotubes dispersion is mixed with polyamic acid to give a CNT-PI dispersion. The CNT-PI dispersion is then dried to form a film or layer of the CNT-PI complex. The dispersant used in this invention is an ionic liquid including organic cations and inorganic anions. The produced CNT-PI complex presents better networked structures and electrical conductivity.
Abstract:
A fiber grinding process includes: contacting an end of the optical fiber with a grinding surface in such a manner that a central axis of the optical fiber at the end is inclined to the grinding surface; rotating the optical fiber about the central axis; and changing a contact pressure between the end of the optical fiber and the grinding surface by applying a variable torque while rotating the optical fiber. A substantially cone-shaped end face with a substantially elliptic cross-section may be produced. A fiber grinding apparatus is also disclosed.
Abstract:
The present invention relates to a conical wedge-shaped lensed fiber and the method of making the same. The method comprises: (a) providing an optical fiber having a central axis and an end; (b) machining the end of the optical fiber to form a flat end face; (c) machining the end of the optical fiber to form a conical region; (d) machining one side of the conical region to form a flat first surface; (e) machining another side of the conical region to form a flat third surface, wherein the first surface and the third surface intersect at a intersecting line that is perpendicular to the central axis; and (f) fusing the intersecting line to form a lens. The method has simplified fabricating processes and need not to set up any particular angle of rotation of the fiber. Therefore, the fabricating time and cost are reduced, and the coupling efficiency of the lensed fiber is up to 90%.
Abstract:
The present invention relates to a conical wedge-shaped lensed fiber and the method of making the same. The method comprises: (a) providing an optical fiber having a central axis and an end; (b) machining the end of the optical fiber to form a flat end face; (c) machining the end of the optical fiber to form a conical region; (d) machining one side of the conical region to form a flat first surface; (e) machining another side of the conical region to form a flat third surface, wherein the first surface and the third surface intersect at a intersecting line that is perpendicular to the central axis; and (f) fusing the intersecting line to form a lens. The method has simplified fabricating processes and need not to set up any particular angle of rotation of the fiber. Therefore, the fabricating time and cost are reduced, and the coupling efficiency of the lensed fiber is up to 90%.
Abstract:
The present invention relates to a conical wedge-shaped lensed fiber and the method of making the same. The method comprises: (a) providing an optical fiber having a central axis and an end; (b) machining the end of the optical fiber to form a flat end face; (c) machining the end of the optical fiber to form a conical region; (d) machining one side of the conical region to form a flat first surface; (e) machining another side of the conical region to form a flat third surface, wherein the first surface and the third surface intersect at a intersecting line that is perpendicular to the central axis; and (f) fusing the intersecting line to form a lens. The method has simplified fabricating processes and need not to set up any particular angle of rotation of the fiber. Therefore, the fabricating time and cost are reduced, and the coupling efficiency of the lensed fiber is up to 90%.
Abstract:
A micro-electro-mechanical system (MEMS) microphone module and a manufacturing process thereof are described. A thickness of a transparent temporary cover plate temporarily disposed in a conventional plastic package structure is adjusted. After a mold for a plastic protector is formed, an UV ray is utilized to irradiate the mold to reduce adherence on the temporary cover plate and a back surface of the MEMS acoustic wave sensing chip. Then, the temporary cover plate is removed, and the left space left is the main source for the back-volume of the MEMS microphone. Finally, a tag is covered on the plastic protector, so as to define the whole back-volume and form a closed back-volume. In the above-mentioned process, the size of the back-volume is the same as an area of the whole MEMS microphone chip. In addition, the back-volume can be defined.
Abstract:
A light emitting diode package module structure comprises a LED module received in a reflection cup, a light transmitting color conversion member disposed on an annular surface of the reflection cup, a stationary package sleeved on the reflection cup in such a manner that the press portion of the stationary package is pressed against the light transmitting color conversion member, and the stop portions of the positioning legs of the stationary package are positioned against the bottom of the reflection cup. In this way, the light transmitting color conversion member is fixed to the reflection cup by the stationary package without the use of adhesive agents, which consequently simplifies the packaging procedure and reduces the package cost.
Abstract:
A fiber grinding process includes: contacting an end of the optical fiber with a grinding surface in such a manner that a central axis of the optical fiber at the end is inclined to the grinding surface; rotating the optical fiber about the central axis; and changing a contact pressure between the end of the optical fiber and the grinding surface by applying a variable torque while rotating the optical fiber. A substantially cone-shaped end face with a substantially elliptic cross-section may be produced. A fiber grinding apparatus is also disclosed.
Abstract:
The present invention relates to a conical wedge-shaped lensed fiber and the method of making the same. The method comprises: (a) providing an optical fiber having a central axis and an end; (b) machining the end of the optical fiber to form a flat end face; (c) machining the end of the optical fiber to form a conical region; (d) machining one side of the conical region to form a flat first surface; (e) machining another side of the conical region to form a flat third surface, wherein the first surface and the third surface intersect at a intersecting line that is perpendicular to the central axis; and (f) fusing the intersecting line to form a lens. The method has simplified fabricating processes and need not to set up any particular angle of rotation of the fiber. Therefore, the fabricating time and cost are reduced, and the coupling efficiency of the lensed fiber is up to 90%.
Abstract:
The present invention relates to a quadrangular-pyramid-shaped lensed fiber. One end of the fiber is ground to become quadrangular-pyramid-shaped. Small volume of the tip of the quadrangular-pyramid-shaped fiber is heated to form a semi-ellipsoidal microlens, thereby forming the quadrangular-pyramid-shaped lensed fiber. The advantage of the present invention is that the shape of the semi-ellipsoidal microlens can be controlled by adjusting the angles of the quadrangular-pyramid-shaped fiber according to the aspect ratio of the diode laser so as to enhance the coupling efficiency between an optical fiber and a diode laser.