JPH052860Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a piezoelectric acceleration pick-up, and in particular to a small, lightweight, piezoelectric acceleration pick-up that applies an axial shear force due to acceleration to an annular piezoelectric element. It is related to.

[Conventional technology]

FIG. 3 shows a conventional piezoelectric acceleration pickup of this type, which includes a metal base 21 having a mounting surface 21a for attaching to an object to be measured by magnets, screws, adhesives, etc., and a main shaft 21b for supporting a piezoelectric element, etc. , an annular piezoelectric element 22 fixed to the main shaft 21b, and a weight 23 fixed to the outer periphery of the piezoelectric element 22 for applying force to the piezoelectric element 22.
, a cover 24 attached to the base 21 to protect them, and a connector 25 press-fitted into the base 21 to extract the output from the piezoelectric element 22.

The connector 25 is connected to the base 21 from the side by press-fitting, and serves as a means for taking out the output of the piezoelectric element 22 to the outside.The hot side connects the outer peripheral electrode of the piezoelectric element 22 to the weight 23, and from the weight 23 to the lead wire 2.
6 to the center electrode 25a of the connector 25.

In the above configuration, the route of the lead wire 26 to the connector center electrode 25a is the connector 2
A center hole 21d of the main shaft 21b is formed perpendicularly to the caulking hole 21c of No.5.

As shown in FIG. 4, the lead wire 26 is routed from the lower surface of the weight 23 through the hole 21e of the base 21 directly below it, and is connected to the connector 25 which is perpendicular to the hole 21e.
This leads to the caulking hole 21c.

The piezoelectric acceleration pickup having the structure described above can be used for devices with a weight of about 1 gram or more, but there are problems with devices weighing less than 1 gram. This difficulty lies in the mounting structure of the connector by press-fitting from the outside, which makes assembly of the connector 25 extremely difficult.

Conventionally, the fifth method was used to eliminate the above weaknesses.
As shown in the figure, a coupling hole 24a for a connector 25 is provided in the upper end side of the main body consisting of the base 21, cover 24, etc.
As shown in Figure 6, a connector 25 is press-fitted into the top surface of the main body, or as shown in Figure 7, a lead wire 26 is led directly from the piezoelectric element. .

[Problem that the invention attempts to solve]

As mentioned above, in conventional piezoelectric acceleration pickups, where the connector is press-fitted into the side of the base, it is difficult to press-fit and swage the connector.
In the case of a device having a connector on the top surface of the main body, the smaller the device is, the more likely the vibration of the cable will affect the sensitivity and cause errors. In addition, those in which the lead wires are directly led out have problems such as the tendency for the lead wires to break.

This invention aims to solve these problems, and is a piezoelectric type suitable for small and lightweight devices that allows easy connection of connectors, eliminates errors caused by cable deflection, and prevents breakage of lead wires. The purpose is to obtain an acceleration pick-up.

[Means for solving problems]

The piezoelectric acceleration pickup according to this invention is
A screw hole penetrating from the side is formed in the base, a female connector part is provided on one side of the screw hole, and a male connector part with a center electrode protruding from the other side is screwed in for electrical conduction.

[Effect]

In this invention, the connector is easily attached to the base by screw connection, and since the connector is close to the mounting surface of the base, errors caused by cord deflection are minimized.

〔Example〕

Figures 1 and 2 show an embodiment of this invention,
A base 1 having a mounting surface 1a and a main shaft 1b is made of metal such as titanium or aluminum, and a screw hole 1c is formed in the lower part of the main shaft 1b to penetrate from the side. An annular piezoelectric element 2 and a weight 3 are attached to the main shaft 1b. An insulating member 4 made of Noryl or the like is screwed to the right portion of the screw hole 1c and fixed with adhesive. A central connector 5 of a female connector is attached to the insulating member 4 from the right side. The center contact 5 has a slot 5a formed on the left side and is caulked a little closer to the center axis than both sides.The center contact 5 is fixed by applying heat to the opening end of the insulating member 4. , by caulking. The center contact 5 and the weight 3 are connected with a lead wire 6 by soldering. The external cable 7 is made of a coaxial shielded wire, the shield portion 7a is turned over, and the center conductor 7b is soldered to the center electrode 8a of the male connector 8. The center electrode 8a is elastically connected to the slot 5a of the center contact 5, held immovably by an insulating guide 9, and fixed with an adhesive. The shield portion 7a of the cable 7 is caulked by two protrusions 10a of the cable holder 10 screwed into the screw hole 1c, and is securely fixed. 11 is a cover.

With the above configuration, the female part and the male part of the connector are adhesively connected from both ends of the screw hole 1c formed through the base 1 from the side, so that the connector can be easily assembled.

[Effect of idea]

As explained above, this idea involves attaching a female connector to the screw hole that passes through the base and connecting it to the weight, and then inserting a male connector from the other end of the screw hole to make the connector connection. , the connector can be installed easily and reliably, and
Measurement errors due to cable sway are minimized, and in addition, it is highly space efficient, weighs less than 1 gram, is compact, lightweight, and has good performance.

[Brief explanation of the drawing]

Figure 1 is a longitudinal sectional view of one embodiment of this invention;
The figure is a partial vertical sectional view of the one in Figure 1, Figures 3 and 4.
Each figure is a longitudinal sectional view of a conventional piezoelectric acceleration pickup, and FIGS. 5 to 7 are schematic front views of other conventional piezoelectric acceleration pickups. DESCRIPTION OF SYMBOLS 1... Base, 1a... Mounting surface, 1b... Main shaft, 1c... Screw hole, 2... Piezoelectric element, 3... Weight, 4... Insulating member, 5... Center contact, 6
... Lead wire, 7 ... Cable, 8 ... Male contact, 8a ... Center electrode, 9 ... Insulated guide, 10 ... Cable holder.

Claims (1)

[Scope of Claim for Utility Model Registration] A mounting surface to be measured, a main shaft perpendicular to the mounting surface to which an annular piezoelectric element and a weight are attached, and a screw hole formed through the mounting surface from the side. a base comprising a base; a center contact of a female contact attached to one side of the screw hole via an insulating member and connected to the weight with a lead wire; an insulating guide and an insulating guide on the other side of the screw hole; A piezoelectric acceleration pickup comprising: a center electrode of a male contact mounted via a cable holder and connected to the center contact; and a cable held by the cable holder and connected to the center electrode.