Conical inductor, printed circuit board and optical module

Abstract

An embodiment of the invention provides a conical inductor, a printed circuit board and an optical module and relates to the technical field of communication. The conical inductor comprises a shell, a conical coil and two pins, wherein the conical coil is located in the shell, the two pins are respectively connected with the two ends of the conical coil, one end of the first pin is connected with one end of the conical coil, the other end of the first pin is fixedly connected with the hole in a first side wall, one end of the second pin is connected with the other end of the conical coil, the other end of second pin is fixedly connected with the hole in a second side wall, each of the first pin and the second pin comprises a waveform section fluctuating along the vertical direction of a top wall, and each trough of each waveform section is fixedly connected to the printed circuit board. By changing the pins of the conical inductor, the aligning accuracy of the pins of the inductor and the welding pads of the printed circuit board is increased, and pseudo welding of the conical inductor is reduced.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a tapered inductor, a printed circuit board and an optical module. Background technique [0002] Due to its large bandwidth and high inductance quality factor (Q value), tapered inductors are widely used in the packaging of 100G optical modules such as transmission network CFP / CFP2, for example, figure 1 It is a schematic diagram of the basic structure of a tapered inductor, such as figure 1 As shown, the tapered inductor is wound by a wire, and its shape is similar to a cone; when the tapered inductor is applied to the inside of the optical module package, the two ends of the tapered inductor are respectively connected to pins, and the pins are soldered to the printed circuit board. On the printed circuit board (referred to as PCB), in order to reduce the parasitic of the pin, in the process of soldering the tapered inductance to the printed circuit board, the surface mou...

AI Technical Summary

Problems solved by technology

[0004] 1) Since the pins of tapered inductors actually used in the industry are usually relatively thin, for example, image 3 Top view of a conical inductance soldered on a printed circuit board for practical use in industry, such as image 3 As shown, the pins of the tapered inductor are thinner than the pads on the printed circuit board, so when the width of the pads on the printed circuit board is constant, the pins of the tapered inductor are easy to solder with the pads on the printed circuit board. Disc deviation, poor alignment

[0005] 2) Since there is a certain gap between the pins of the tapered inductor and the surface of the printed circuit board, for example, Figure 4 A side view and enlarged view of a conical inductance soldered on a printed circuit board actually used in industry, such as Figure 4 As shown, the height of the tapered inductor pins from the surface of the printed circuit board is S, so the tapered inductor pins may not touch the printed circuit board during the process of soldering the tapered inductor to the printed circuit board using SMT. The pad and its solder on the surface can easily lead to virtual soldering of the conical inductor

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