JPS60244191A - Electroacoustic transducer - Google Patents

Abstract

PURPOSE:To eliminate restrictions of a vibration and to improve an acoustic characteristic by opening some part of an outer electrode element assembly and pulling out a lead wire of the inner electrode element assembly through said opened part. CONSTITUTION:When a digital signal subjected to PCM is inputted and an acoustic signal is reproduced, respective lead wires 8 open some parts of respective electrode element assemblies 7a-7d, and pulled out from said assemblies without contacting the electrode element assemblies 7a-7d; therefore a vibration of respective acoustic transducing units S1-S4 will not be restricted, and an acoustic characteristic can be improved. Respective electrode element assemblies 7a-7e are formed into a solid construction with respective lead wires 8 by the same conductive material, and consequently a connection part is eliminated, thereby improving the acoustic characteristic. Furthermore the separate installation of a lead wire becomes unnecessary, and the manufacturing process can be reduced.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a multi-unit electroacoustic transducer that directly inputs a PCM (pulse code modulation) signal and converts it into an analog acoustic signal. .

[Prior art]

・In the above multi-unit electroacoustic transducer,
The conversion method for one unit is the electrodynamic type.

There are electrostatic types, piezoelectric types, and electromagnetic types. In addition, methods for driving the entire converter include (11) one in which units with the same performance are used and driven by weighted PCM signals, and (2) units with different driving forces and diaphragm areas are used to drive the converter itself. What to weight, (3) above (11)
, +21.

, FIG. 1 is a front view showing a conventional converter using the above-mentioned multi-unit system.
This is shown in Publication No. 7. As shown in the figure, the above-mentioned transducer has a plurality of acoustic transducers (Unisono)Si on one diaphragm.
S2. . . . This is based on the above driving method (2) in which Sr is arranged concentrically and weighted according to their area. In the above unit configuration, it is necessary to take out the lead wires from the electrodes of the inner unit to the outside.

FIG. 2 is a configuration diagram of the electrode of the above-mentioned conventional example! In the figure, 1 is a disc-shaped diaphragm, and the diaphragm 1 has an electrode 2.
is provided. The electrode 2 is an acoustic conversion unit 51
~Corresponding to S5, ring-shaped electrode bodies 2a, 2b, 2
c, 2d, and 2e are partitioned by a gap 3 and arranged concentrically.

Further, the outer peripheral portion 1a of the diaphragm 1 where no electrodes are provided.
are provided with input terminals 4a to 4e to which digital signals corresponding to the respective electrode bodies 2a to 2e are input. On the other hand, beams -YvA5 are pulled out from each of the electrode bodies 2a to 2e, extend along the outer electrode bodies, and input terminals 4a to 4
connected to e. In addition, 6 is the said electrode element body 2a-2
This is the connection part with the lead wire 5 provided at e. In such a configuration, a digital signal converted into PCM via each input terminal 4a to 4e is transmitted to each electrode body 2a to 4e for each bit.
2e, each corresponding acoustic conversion unit 51
~S5 generates sound pressure according to its area, and these are combined to reproduce the original acoustic signal.

However, in the conventional electroacoustic transducer described above, each electrode body 2a to 2d is arranged from the inside to the outside.

Since a lead wA5 is provided extending to
The disadvantage was that the vibration of 4 was restricted and the acoustic characteristics deteriorated.

[Summary of the invention]

The present invention eliminates the above drawbacks by opening a part of the outer electrode element and drawing out the lead wire of the inner electrode element through this open part. This will be explained in detail using .

(Embodiment of the Invention) FIG. 3 is a simplified configuration diagram showing an embodiment of an electroacoustic transducer according to the present invention. In the figure, a diaphragm 1 is provided with four electrodes 7 having a shape different from that of the conventional example. Electrode 7
are a plurality of ring-shaped electrode bodies 7a, 7b, 7c, 7d, 7
Each electrode body gradually becomes larger in diameter so as to surround the inner electrode body, and among the electrode bodies 7a to 7e, some of the electrode bodies 7a to 7d are open, The lead wire 8 of the electrode body located inside is drawn out through this open portion A. For example, as shown in FIG.
0, the lead wire 8 of the electrode body 7e located on the inside extends through the open portion A of the electrode body 7b located on the outside. In this case, each lead wire 8 is connected to the end A1 on the open portion A side. Each lead ll#18 is the diaphragm 1
It is connected to an input terminal 9 provided on the outer peripheral portion 1a of the. Note that each lead wire 8 is made of the same conductive material as each electrode body 7a to 7e, and is formed by, for example, a method such as vacuum deposition or etching.

The present embodiment is configured as described above, and when a PCM digital signal is input, the original acoustic signal is reproduced, but each lead wa8 is pulled out without contacting each of the electrode bodies 7a to 7d. Therefore, the vibrations of the corresponding acoustic transducing units 31 to S4 are no longer restricted, and the acoustic characteristics are improved. In addition, since each electrode body 7a to 7e and each lead wire 8 are integrally formed using the same conductive material, the connection part 6 in the conventional example is eliminated, and the acoustic characteristics are improved in the same way as above, and the lead wA8 can be connected separately. There is no need to attach it, and the manufacturing process can be reduced.

In the above embodiments, an area-proportional circular drive system is shown, but a drive system using the above-mentioned (1) or (3) may also be used.Furthermore, a square drive system as shown in FIG. Alternatively, it may be of various shapes such as an ellipse. Further, each lead wire 8 is drawn out alternately on the left and right around the lead wa8 of the electrode body 7e, but the present invention is not limited thereto.

〔Effect of the invention〕

As explained above, according to the electroacoustic transducer of the present invention, a part of the outer electrode element of the electrode element is opened, and the lead wire of the inner electrode element is drawn out through this open part. As a result, vibrations are no longer restricted and acoustic characteristics are improved.

[Brief explanation of drawings]

1 and 2 are simplified configuration diagrams showing an example of a conventional electroacoustic transducer, FIGS. 3 and 4 are simplified configuration diagrams showing an embodiment of an electroacoustic transducer according to the present invention, and FIG. FIG. 2 is a simplified configuration diagram showing another embodiment. DESCRIPTION OF SYMBOLS 1... Vibration plate, 7... Electrode, 7a-7e... Electrode element body, 8... Lead wire. In the drawings, the same reference numerals are used for the same or corresponding parts. Agent Masu Oiwa (2 others) Figure 2

Claims (2)

[Claims] (1) In an electroacoustic transducer comprising an inner electrode element and an outer electrode element surrounding the electrode element and provided with an electrode facing a diaphragm, the outer electrode element of the electrode element is An electroacoustic transducer characterized in that a part of the body is opened, and a lead wire of an inner electrode body is drawn out through this open part. (2) The electroacoustic transducer according to claim 1, wherein the lead wire is made of the same conductive material as each electrode body.゛