Non reversible circuit element and its used wire frame and manufacturing method, communication device

Abstract

Provided is an irreversible circuit element small in mounting area and having a terminal good in solderability and free from rusting. In the irreversible circuit element such as an isolator (1), a magnetic assembly having a common electrode and a center conductor attached to a plate-like magnetic material and a permanent magnet are stored in an enclosure (20) formed into a rectangular parallelepiped approximately, and dimensions (L) of the longer side of the enclosure (20) is <=3.5 mm, and an independent terminal connected to the center conductor is arranged in an outline (20a) of the enclosure (20).

Description

technical field [0001] The present invention relates to a nonreciprocal circuit element such as an isolator or a gyrator, a communication device, a lead frame for the nonreciprocal circuit element, and a method for manufacturing the nonreciprocal circuit element. Background technique [0002] A lumped constant type isolator, one of the non-reciprocal circuit components, is a high-frequency component that allows signals to pass through without loss in the direction of transmission and prevents signals from passing in the opposite direction. It is used in mobile communications such as portable phones. The transmission circuit part of the device. Such an isolator is constituted, for example, by accommodating a magnetic assembly formed by attaching a common electrode and a center conductor to a plate-shaped magnetic body and a permanent magnet in a metal frame. The frame body is formed integrally with an upper frame (yoke) and a lower frame (yoke) made of soft iron. In additio...

AI Technical Summary

Problems solved by technology

[0005] However, in the separator described in Patent Document 1, the slit is cut out from the frame part after electroplating, so the truncated surface of the slit is in a state without plating.

If there is a part that is not plated, there is a possibility that the adhesion of the solder will deteriorate during mounting and poor contact will occur.

Also, since the soft iron is exposed in the non-plated part, there is a possibility of rusting here

In addition, when the above-mentioned isolator is used as a component of a communication device, there is a risk that the generated rust will fall off and short-circuit the circuit lines in the communication device.

Moreover, in the past, the independent terminal and the grounding terminal of the isolator exceeded the outline of the frame in many cases, especially if the long side dimension of the frame was not greater than 3.5 mm, the excess of the terminal when it was installed on the circuit board could not be ignored. area, there is a problem that the installation area cannot be reduced

[0006] Furthermore, in the spacer described in Patent Document 1, the cut and raised piece is bent at 180° and the front end of the cut and raised piece is arranged in the notch of the lower frame portion, but since the depth of the notch is larger than the width, The lower frame part constituting the magnetic channel is dug deeply, which may adversely affect the offset magnetic field

Moreover, when insert molding the louvers together with the resin, since the width of the louvers is small, the contact area between the resin and the louvers is small, and there is a risk that the louvers fall off the lower frame.

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