JPS58207800A - Transducer - Google Patents

Abstract

PURPOSE:To reduce the number of components, to simplify the construction and to improve the manufacturing efficiency, by stretching a diaphragm formed with a magnetized magnetic substance layer in front of a magnetoelectric converting element at a prescribed interval. CONSTITUTION:When a sound wave is incoming from a sound path 25 of a case 13 of a microphone, a diaphragm 7 is vibrated. The diaphragm 7 comprises a thin insulating film under a film ring 6 and a magnetic substance layer coated with the magnetized magnetic substance under the film. The magnetic flux crossing a Hall element 19 is changed with the vibration of the diaphragm 7. As a result, an output voltage in response to the vibration is obtained between an output terminal 23 and an earth terminal 24 of the Hall element 19. Since this microphone is constituted with a base 16 incorporating the Hall element 19 and the film ring 6 stretched with the diaphragm 7, the construction is simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a transducer suitable for microphones and the like.

[Technical Background of the Invention] As a transducer, for example, a microphone, the Electref 1-type Ndenri microphone as shown in FIGS. 1 and 2 is well known.

In other words, a fixed electrode 3 is constructed by forming an electrified polymer dielectric layer 2 on one main surface of the electrode 1.
is supported on the upper end of a cylindrical base 4, and a vibrating membrane 7 stretched across a membrane ring 6 is placed in front of the fixed electrode 3 via a spacer ring 5 placed on the upper end of this base 4, For those who connect the input lead 9 of the impedance conversion element 8 housed in the base 4 to the electric wire 44i1, connect the protruding horn lead 1
0 to the circuit pattern 12 of the print I-M board 11 that closes the lower end of the base 4, and the metal case 13 is placed over the base 483 and the membrane ring 6 to cover the printed circuit board 11.
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Note that reference numerals 14 and 15 indicate external output terminals embedded in the printed circuit board 11.

This Ruri 1-Reflex 1-type capacitor/microphone is formed on a fixed electrode 3 and a vibrating membrane 7, and converts the output voltage due to the capacitance change of a conductive cross (not shown) into an impedance conversion element. 8 to the outside at low impedance.

[Problems with the Background Art] However, the conventional electronic 1-let type fundenza microphone configured in this manner has many components such as a base 4, a spacer ring 5, a printed circuit board 11, etc. in addition to the fixed electrode 3 and the vibrating membrane 7. It consists of the following components, so
The drawback is that the assembly is complicated and the manufacturing process is not reduced and the production efficiency is not improved.

In addition, the polymer dielectric layer 2 of the fixed electrode 3 is susceptible to deterioration when the ambient temperature is high, and it is not susceptible to dust, etc. adhering to f=J or to being affected by moisture. Not only does it require a sufficiently airtight support structure, but it also requires careful handling, which limits its range of use and does not have good mechanical strength.

[1-1] The present invention has been made to solve these drawbacks, and has an extremely simple structure and is resistant to changes in ambient temperature and humidity as well as mechanical vibrations. The purpose is to provide an inexpensive transducer with excellent characteristics.

[Summary of the Invention] In order to achieve this L1 goal, the present invention involves stretching a vibrating membrane on which a magnetized magnetic layer is formed at a predetermined interval on the front side of a magnetoelectric transducer such as a Hall element. It is characterized by:

[Example 1 of defense The details of the present invention will be explained below with reference to the drawings.

J3 conventional example and J (passing parts are given the same reference numerals.

3 and 4 are a sectional view and an exploded perspective view of an embodiment of the transducer of the present invention, and show a microphone as an example.

In the figure, the base 16 is a platform 1 with a flat upper surface in the center of the turret.
7, and annular support walls 18 are integrally molded from non-magnetic synthetic resin or the like at intervals around the base 17, and within the base 17 there are conventionally known holes. Element 19 is molded.

A communication hole 20 connecting the front side and the back side of the base 16 is bored between the base part 17 and the support wall 18, and the lower end opening of the communication hole 20 is filled with an acoustic resistance agent 21 for adjusting directivity. It's blocked.

The tip of the support wall 18 slightly protrudes from the upper surface of the base portion 17, and a discipline ring 6 having a vibrating membrane 71° (to be described later) stretched thereon is attached to the tip.

Reference numerals 22 to 24 indicate bias terminals installed in the base 16 and connected to the small element 19.
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The diaphragm 7, the membrane ring 643, and the base 16 are covered with a metal case 13 in the shape of a bulge that covers the sound path 25.
It is crimped and fixed on the F side of the base 16.

As shown in FIG. 5, the above-mentioned vibrating membrane 7 consists of a thin insulating noil film 26 stretched over the side-facing lower surface of the membrane ring 6 (the lower surface in the figure) and a magnetized magnetic material adhered to this lower surface. It consists of layer 27. This magnetic material 11!27 is made by uniformly fixing a ferromagnetic material such as Noelai 1 to powder, and as shown in the figure, it is magnetized by repeating N and S poles alternately in concentric circles. ing.

The microphone configured as described above vibrates with vibration II 7 when a sound wave enters from the @ channel 25 of the case 13.・
On the other hand, the hole cable 19 (yo,
Generally, as shown in FIG.
When a magnetic flux B passes through from a direction perpendicular to the electric field, an output voltage V is obtained from a direction perpendicular to both the magnetic flux and the electric field. The magnetic flux of the magnetic layer 27 changes. Therefore, an output voltage corresponding to the vibration of the vibrating membrane 7 is generated between the output terminal 23 and the ground terminal 24 of the Hall cable 19.

-C, the microphone of the present invention has a Hall cable 19.
Since it can be configured with a base 16 with a built-in diaphragm 7 and a crotch ring 6 that exceeds the vibrating membrane 7, the structure becomes extremely simple. In addition, the magnetic flux density applied to the Hall cable 19 and its output voltage exhibit a nearly proportional linear characteristic as shown in FIG. 7, which can be easily obtained. 5I, and the bias voltage applied to the Hall element 19 [, the distance l between the diaphragm 7 and the Hall element 19]
By changing the magnetic flux density of l1itJ3 and the magnetized magnetic layer 27 of the vibrating membrane 7, the output voltage can be changed.

In addition, the characteristics can be kept constant even when the exhaustion 1a changes even when the Hall cable 19 is changed to m stages.

In carrying out the present invention, the base 16 that holds the Hall element 19 and supports the vibrating membrane 7 can be molded into any desired shape using synthetic resin, and the vibrating membrane 7 is directly stretched thereon. You can also do that.

Further, in the transducer of the present invention, when a metal plate or a magnetic substance approaches the vibrating membrane 7, the vibrating membrane 7 is displaced and its magnetic flux changes, causing the output of the Hall element 19 to change. It is also suitable for detecting the position of an object or for detecting the position of an object.

i13, in the present invention, the above-mentioned Hall element 19
In addition, magnetoelectric transducers such as magnetoresistive elements and magnetic diodes can be used.

"Effects of the Invention 1 and Beyond" - As explained above, the transducer of the present invention has a vibrating membrane in which magnetized magnetic layers are formed stretched at predetermined intervals in front of a magnetoelectric transducer. In addition, the number of component parts is greatly reduced and the structure is simplified, and assembly is also extremely simple, making it possible to reduce costs and improve production efficiency.

Furthermore, the magnetization of the magnetic layer formed on the diaphragm has relatively little deterioration due to temperature (high temperature), and since the magnetoelectric conversion element is also buried within the base, it is difficult for the machine to be affected by external influences. It has a strong ISk and a good 9r. As a result of (a), for example, it can be used as a sensor in a nuclear reactor pressure vessel, and the range of use is expanded.

[Brief explanation of the drawing]

1 and 2 show a conventional transducer, and FIGS. 11
5 and an exploded perspective view, FIG. 5 is a cross-sectional view of the J diaphragm shown in FIG. Jj 1. FIG. 3 is a characteristic diagram of magnetic flux density and output voltage. 1... Electrode 2... Polymer dielectric layer 3...
......Fixed electrode 4.16...Base 5...Sube' membrane ring 6...
......Membrane ring 7...Vibration membrane 8...Impedance conversion element 1
1...... Printed U board 17...
......Base part 1B......Supporting wall 19......Magnetoelectric conversion element 27...
・・・・・・・・・Patent attorney representing magnetized magnetic layer
Suyama Sa - 465

Claims (1)

[Claims] A 146 transducer characterized in that a vibrating membrane on which a magnetized magnetic layer is formed is stretched at a predetermined interval in front of a magnetoelectric transducer.