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24551results about How to "Suitable for mass production" patented technology

Manufacture method for polarization maintaining fiber and polarization maintaining fiber

The invention provides a manufacture method for polarization maintaining fiber and a polarization maintaining fiber, and relates to optical waveguide fibers in the field of fiber-optical communication and fiber optical sensors. The method comprises the following steps that: (1) two oppositely arranged open slots with a same shape are inwardly provided at a side surface of a glass mother rod, stress rods are machined to obtain a shape matching the open slots, and the centers of the cross sections of the two open slots and the center of circle in the cross section of the glass mother rod are in a same line; (2) the stress rods are respectively inserted into each open slot on the glass mother rod, and the assembled glass mother rod and stress rods are put in a cannula to form a preformed rod of the polarization maintaining fiber; (3) the preformed rod of the polarization maintaining fiber is drew to form the polarization maintaining fiber. According to the invention, the glass mother rod is provided with the open slots, and the stress rods are embedded in the open slots, thereby obtaining high process repeatability; inner surfaces of the open slots have high fineness, and the open slots have good symmetry, thereby improving processing efficiency; therefore, the optical performance and reliability of the polarization maintaining fiber are substantially improved.
Owner:RUIGUANG TELECOMM TECH CO LTD

Electromagnetic shielding optical window with double-layer pane metal gridding structure

The invention relates to an electromagnetic shielding optical window with a two-double pane metal grating structure and belongs to the optical transparent piece electromagnetic shielding technical field; the electromagnetic shielding optical window is formed by placing two layers of pane metal gratings or metal silk screens with the same structure parameters on two sides of the optical window or a transparent underlay in parallel; a side length of a pane of the two-double pane metal grating is greater than two times of a side length of a pane of the prior monolayer pane metal grating; the space between two layers of pane metal gratings is two to four times of the side length of the pane; compared with the prior monolayer pane metal grating, the optical window adopting the two-double pane metal grating structure does not reduce light transmittance, substantially improves the shielding efficiency of microwaves and millimeter waves, solves the problems that the high light transmittance and strong electromagnetic shielding efficiency can not simultaneously considered in the prior optical window electromagnetic shielding technology and is suitable for electromagnetic shielding in aerospace equipment, security facilities, medical diagnostic instruments and other military and civil optical transparent pieces.
Owner:HARBIN INST OF TECH

Optical module for high-speed bidirectional transceiver

InactiveUS6939058B2Simplified adjustment procedureEasy constructionCoupling light guidesTransceiverOptical Module
The optical module of the invention for high-speed bidirectional transceiver consists of a signal receiving unit, a signal transmitting unit, a common receiving-transmitting optical fiber, and a fiber coupling unit. The laser diode and the photodiode are arranged parallel to each other in closely located recesses of the module housing. Such an arrangement makes it possible to shorten distances for guiding lead wires from the terminals of the PC board to the respective terminals of the transmitting and receiving diodes. The laser diode emits a first transmitting laser beam that passes through a microobjective that collimates the beam and directs into onto a full-reflection mirror located inside the module housing. The full-reflection mirror reflects the first transmitting beam at an angle of 90° and transmits it to the end face of an optical fiber through an optical fiber collimator that centers the beam with the fiber core. The module is provided with a second mirror, which is fully transparent to the aforementioned first transmitting beam, but is fully reflective to a second transmitting beam that may propagate in a direction opposite to the first transmitting beam on a different wavelength. Alignment of the optical components is facilitated due to the fact that it is carried out with diffractionally limited and collimated beams.
Owner:MICROALIGN TECH +1

Grain boundary phase-reconstructed high-corrosion resistance Sintered NdFeB magnet and preparation method thereof

The invention discloses a sintered Nd-Fe-B magnet with high corrosion resistance and the grain boundary reconstruction and a preparation method thereof. The composition of the invention is that: NdeFe100-e-f-gBfMg, wherein, e is greater than or equal to 6 and equal to or less than 24, f is greater than or equal to 5. 6 and equal to or less than 7, g is greater than or equal to 0.03 and equal to or less than 8, M is one or some of elements Dy, Tb, Pr, Sm, Yb, La, Co, Ni, Cr, Nb, Ta, Zr, Si, Ti, Mo, W, V, Ca, Mg, Cu, Al, Zn, Ga, Bi, Sn and In; The method is that: main phrase alloy and reconstructed grain boundary phase alloy are respectively pulverized and mixed uniformly; the powder mixture is pressed to a mould in the magnetic field, and fabricated into a sintering magnet in a high vacuum sintering furnace. By the reconstruction of the grain boundary phase composition, the invention can obtain the grain boundary phase alloy with low melting point and high electrode potential, decrease the potential difference between the main phase and the grain boundary phase on the basis of ensuring the magnetic properties, promote the intrinsic corrosion resistance of magnet, and has the advantages of simple process, low cost and being suitable for the batch production. Therefore, by combining the grain boundary reconstruction and double alloy method, the sintered Nd-Fe-B magnet with high intrinsic corrosion resistance can be prepared.
Owner:ZHEJIANG UNIV
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