JPS6348096Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an inductor adjustment mechanism suitable for adjusting the cavity of a coil in a high-frequency filter, resonator, etc., and is a circuit component mechanism that can easily and reliably reduce the number of assembled parts and achieve adjustment. be.

The conventionally well-known structure for varying the inductance of a high-frequency coil is to
This armature itself is threaded and fitted into the fitting screw of the insertion hole drilled in the lid of the container, and a spring washer is interposed in the limited contact area of the armature head with the lid body to prevent it from loosening. It was something like that. Therefore, in the environment in which electronic devices assembled with such high-frequency circuit components are put into practical use, especially when they are frequently subjected to mechanical shock or vibration, the length of the threaded part to be fitted with the cover body is extremely short, and it is difficult to connect the screw part to the cover body in one place. As a result, the amateur air-core coil loosens in the backward direction, which inevitably changes the circuit constant, resulting in drawbacks such as the inability to expect precise inductance adjustment at all.

In view of the above-mentioned problems, the present invention allows the armature to move forward and backward freely through two threaded parts on the folded side of the overhanging piece that exerts elastic force and the metal lid, and also allows the metal plate of the shield container to rotate freely. It has a structure that serves both purposes.

Embodiments of the present invention will be described below with reference to the drawings. First, Figure 1 is a developed top view of the metal cover punched out together with the overhang piece, and Figure 2 is a side view of the actual state in which the overhang piece is bent at the base of the metal lid and the armature is inserted.
FIG. 3 is a vertical cross-sectional view of the device of the present invention implemented in a shielded container containing an air-core coil.

A metal lid 51 covering the shield container in FIG.
An overhanging piece 52 is provided to protrude from two opposing sides of the armature 6, and the overhanging piece forms a curved part at its base B and is bent toward the upper surface of the lid, and the armature 6 is placed at a position corresponding to the axial center of the air-core coil. A metal plate is punched out so that an insertion hole H into which the projections P ₁ and P ₂ are inserted is formed concentrically with the projections P 1 and P 2 . Here, the metal plate material may be any metal material as long as it is a non-magnetic material suitable for high frequency shielding and can provide a strong elastic force to the overhanging piece. F is an attachment hole to the shield container. Further, in FIG. 3, an embodiment with a built-in multi-stage coil has been described, but it goes without saying that the present invention can also be applied to an inductor of a single high frequency circuit having the basic requirements of the present invention, as shown in FIG.

Next, in FIG. 3, an air-core coil 1 wound on a bobbin 2 connected to a wiring pattern on a printed circuit board 3 is surrounded by a shield container 4, and the air-core coil 1 is surrounded by a shield container 4 so as to cover the open end of the container. Place and fix the metal lid. When the armature 6 is inserted through the insertion hole drilled at a position that coincides with the axial center of the metal lid, the overhanging piece, and the air-core coil, the upper surface of the lid and the lower surface of the overhanging piece will come together as shown in FIG. It is screwed through the curved part until it becomes almost parallel.

With the above mechanism, the armature as an adjustment screw is screwed in two places: the non-magnetic metal lid and the overhang piece that curves with the edge of this metal lid as the base.
Moreover, since the elastic force of the curved portion acts on the fitting portion of the screw, it is extremely securely fixed in the hollow space of the air-core coil.

Thus, according to the present invention, when fixing the armature as an adjustment screw at a predetermined position within the air-core coil, an overhanging piece is formed integrally with the lid body, and the elastic force of the overhanging piece is utilized. The holding base of the projecting piece can also be used as the lid of the shield box, and as the threaded part of the armature is inserted in two places, the lid and the separated projecting piece, no other fixing parts are required. Since it can be punched out from the original plate by press processing, it is extremely efficient and economical. Therefore, the fixed position of the armature is kept unchanged by external vibrations, so that the high frequency circuit component can be always stable without any change in frequency characteristics.

[Brief explanation of the drawing]

FIG. 1 is an exploded top view of the adjusting member of the present invention, FIG. 2 is a longitudinal sectional view of the mechanism of the present invention, and FIG. 3 is a sectional view of the assembly. 1: air core coil, 2: bobbin, 3: board, 4:
Shield container, 51: metal lid, 52: overhang piece,
6: Amateur, B: Curved base, F: Fixing hole,
H: Through hole, P ₁ , P ₂ : Projection.

Claims (1)

[Scope of utility model registration request] In a high-frequency circuit component that adjusts the cavity by moving an armature back and forth in the direction of the hollow axis of an air-core coil that is insulated and fixed upright on the bottom substrate in a shield container, the area that covers the entire area surrounded by the open end of the shield container integrally includes at least one overhanging piece extending from at least one side of the metal lid to a fixed position of the air-core coil,
Bend the overhanging piece from the base of the metal lid onto the metal lid to the fixing position of the air-core coil, and place the overhanging piece and the metal lid at a position that corresponds to the fixing position of the air-core coil. An adjustment mechanism for a high frequency circuit inductor, characterized in that an insertion hole is formed concentrically with a projection screwed into the armature, and the cavity can be adjusted by moving the armature forward or backward.