Improved variable condenser

Abstract

An improved variable capacitor includes main set main set part and preset part, wherein preset part composed of cover board, preset stator plate, preset moving plates, preset axle, preset film, preset earthing soldering piece and soldering piece. It features positioning bracket increased on cover board to make convenient positioning in installing preset stator plate and soldering piece, designing preset stator plate and preset moving plates in regulating capacitance to minimal without superposition, and to form one disengage spacing D, fan-shaped with height 0.05-0.3 mm on cover board to make preset stator plate close fitting on preset moving plates. Compared with current technology, said invention structure is more reasonable with more portably accurately positioning, more ideal preset capacitance, capable of furthest reducing even eliminating beaten noise.

Description

technical field [0001] The invention relates to a capacitor design technology with variable capacitance, in particular to an improved variable capacitor. Background technique [0002] Existing commercially available variable capacitors, such as variable capacitors used for radios, have a structure that includes a main tuning part (made up of a base, an active sheet, a main fixed sheet, a film spacer, a main adjustment shaft fixedly connected with an active sheet, etc. ) and the pre-adjustment part, wherein the pre-adjustment part is composed of the cover plate, the pre-adjustment plate, the pre-adjustment plate, the pre-adjustment shaft, the pre-adjustment film, the pre-adjustment grounding solder piece and the welding piece, etc., which are installed on the surface of the cover plate. The preset fixed piece and the preset grounded welding piece are respectively installed on the two surfaces of the cover plate. The preset fixed piece is a metal piece composed of two geometri...

AI Technical Summary

Problems solved by technology

The structure of the above-mentioned traditional variable capacitor has the following deficiencies: the structure of the presetter is complicated, the manufacturability is poor, and the reject rate is high (generally all above 10%). The connection is only realized by the fasteners at one corner, and in addition, most of the preset piece is not restrained in its thickness direction and is in a relatively free state, thus causing its close contact with the preset piece ( In this way, in the process of rotating the pre-adjustment shaft, the pre-adjustment plate will vibrate in the direction of its thickness, which will cause interference with electrical signals and produce serious beeping and beeping noises, which will affect the normal operation of the variable capacitor

But the above-mentioned structure of this patent still has the following deficiencies: (1) sector-shaped preset sheet and pin sheet (welding sheet) are installed on the cover plate by fasteners only through the through hole at one end when installing , resulting in difficult positioning during production and debugging, which affects the efficiency of installation and debugging and the accuracy of positioning

In addition, the above-mentioned positioning method of the fan-shaped preset piece has defects, and it is easy to slip off and cause a short circuit between the fixed piece and the moving piece of the preset part.

The welding piece is only fastened on the preset piece by fasteners, without positioning, causing the welding piece to swing easily and loosen the fastener nut

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