JPS5942747Y2 - mechanical filter - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a support structure for a resonator in a mechanical filter.

FIG. 1 shows the main parts of a resonator support structure in a conventional mechanical filter.

In the figure, 1 is a resonator, 2 is a coupling line, and 3a and 3b are support lines.

The mechanical filter 1 obtains filter characteristics by transmitting the vibrations of the resonator 1 one after another through the coupling wire 2 and resonating each one, and the resonator 1 is located at the node of the vibration (usually at the center in the axial direction). By being joined and fixed to the support lines 3a and 3b at portions 3a and 3b, a predetermined distance is maintained between the support lines 3a and 3b.

The support wires 3a, 3b are further fixed to support structures (not shown) such as other support plates and holders by adhesives, welding, or the like to hold the resonator 1.

Therefore, the work of joining the resonator 1 to the support wires 3a and 3b requires high precision, and the assembly work often involves complicated processes using complicated jigs, and there are many factors that cause variations in the filter characteristics. This had the disadvantage of increasing the amount of water.

The present invention has a simple structure, can accommodate various pitches between resonators, allows the use of support plates with rough dimensional accuracy except for the joints with the resonators, and does not apply stress to the bonding wires. The purpose of the present invention is to provide a mechanical filter characterized by the above characteristics, and its purpose is to obtain stable filter characteristics and to simplify assembly work.

This will be explained in detail below with reference to the drawings.

2 and 3 are views showing one embodiment of the present invention, with FIG. 2 being a front view and FIG. 3 being a side view.

In the figure, 1 is a resonator, 2 is a coupling line, and 4 is a support plate in place of the support lines 3a and 3b.

This support plate 4 is composed of a plurality of tongue-like protrusions 5, a joining protrusion 6, and one deflection control part 7.

The above-mentioned deflection control section 7 is formed by bending a thin metal plate into a substantially U-shape, and the plurality of tongue-like protrusions 5 are formed by combing one of the shape-shaped pieces of the deflection control section 7. It is integrally constructed with an extended tooth-like shape.

Further, one joining projection 6 is provided near the tip of each of the tongue-shaped projections 5.

The shape of this joining protrusion 6 is as shown in FIG.
In addition to those with the tip bent at right angles, tongues with a V-shaped bend at the tip of the tongue-like protrusion 5 as shown in Figure 4, or small metal pieces in the shape of an oval or rectangle. Various configurations are conceivable, such as one in which the distal end of the shaped protrusion 5 is welded in a horizontally elongated manner, and one in which a joining protrusion 6 is provided by molding.

The resonators 1 are arranged in parallel with the tongue-shaped projections 5 of the support plate 4, and are fixedly connected to the joint protrusions 6 of the tongue-shaped projections 5 by welding or the like at vibration nodes.

Resonator 1 bonded and fixed to tongue-shaped protrusion 5 in this way
is supported with one end thereof inserted into the deflection control section 7 which is bent into a ] shape.

In this case, consideration is given to making the U-shaped dimension of the deflection control section 7 slightly larger than the diameter of the resonator 1 so that the resonator 1 and the deflection control section 7 do not come into contact with each other in the supported state.

This deflection control section T regulates the amount of vibration displacement of the resonator 1 when excessive external vibration including external force is applied, thereby causing permanent deformation between the resonator 1 and the coupling protrusion 6 of the support plate 4. and to prevent damage.

As explained in detail above, according to the present invention, only the support plate 4 is used instead of the support wires 3a, 3b and the support structure, which were conventionally separate structures, so the structure is simple and the tongue-shaped Since the coupling protrusion 6 of the protruding part 5 is installed in a horizontally long manner, it is possible to accommodate variations in the pitch of the resonator 1 determined by the filter characteristics. It can also be shared.

Furthermore, by joining the resonator 1 and the support plate 4 (by welding, etc.), there is no variation in pinch between the resonators, stress is not generated on the coupling wire due to the assembly process, and good filter characteristics as a mechanical filter can be obtained. I can do it.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the main parts of a conventional mechanical filter, Fig. 2 is a front view of an embodiment of the present invention, Fig. 3 is a side view of the same, and Fig. 4 shows the shape of the coupling protrusion of the support plate. It is a side view showing an example. 1...Resonator, 2...Coupling line, 3a,
3b...Support line, 4...Support plate, 5.
...tongue-like protrusion, 6... combination projection, 7.
... Runout control section.

Claims (1)

[Scope of utility model registration request] A plurality of resonators to obtain filter characteristics by transmitting their vibrations one after another through a coupling wire, and a substantially surrounding one end of each resonator to protect the resonators from external vibrations. A runout control part having a shape of a letter, a plurality of tongue-like protrusions arranged in the shape of a comb tooth on one piece of the runout control part, and a plurality of tongue-like protrusions arranged near the tip of the tongue-like protrusions, respectively. 1. A mechanical filter comprising a support plate, which is provided one at a time, and includes a bonding protrusion for supporting vibration nodes of the resonator by bonding to the vibration nodes.