JPS60244192A - Electroacoustic transducer - Google Patents

Abstract

PURPOSE:To eliminate restrictions of a vibration and to improve an acoustic characteristic by deviating each electrode element assembly in one outer peripheral direction of a diaphragm and pulling out lead wires of inner electrode element assemblies through an opened part of the outer electrode element assemblies at the deviation side. CONSTITUTION:When a digital signal subjected to PCM is inputted and an acoustic signal is reproduced, respective lead wires 8 deviate respective electrode element assemblies 7a-7d to the outer peripheral side of a diaphragm, and open the electrode element assemblies 7a-7d at the deviation side. Said lead wires 8 are pulled out from these opened part without contacting said assemblies 7a-7d; therefore vibrations of respective acoustic transducing unit S1-S4 will not be restricted and an acoustic characteristic can be improved accordingly. Since these electrode element assemblies lead wires 8 by the same conductive material, a connection part is eliminated and the acoustic characteristic can be improved. Furthermore a separate installation of a lead wire becomes unnecessary, and therefore a 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 multi-unit electroacoustic transducer mentioned above, the conversion method for one unit is the electrodynamic type.

There are electrostatic types, piezoelectric types, and electromagnetic types. In addition, there are two ways to drive the entire converter: (1) using units with the same performance and driving it with a weighted PCM signal; (2) using units with different driving forces and diaphragm areas to drive the converter itself. (3) (1) above,
, (2), etc.

FIG. 1 is a front view showing a conventional converter based on the multi-unit system, as disclosed in, for example, Japanese Patent Laid-Open No. 58-121897. As shown in the figure, the transducer has a plurality of acoustic transducer units SL and S2 on one diaphragm.
．． . . . This is based on the above driving method (2) in which Sr is arranged concentrically and weighted according to their areas. 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 connected to the acoustic conversion unit 3
1 to S5, ring-shaped electrode bodies 2a, 2b,
2c, 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, lead wires 5 are drawn out from each of the electrode bodies 2a to 2e, extend along the outer electrode bodies, and are connected to input terminals 4a to 4e.
Connected to 4e. In addition, 6 is the above-mentioned electrode element body 2a~
Lead &? installed in 2e? This is the connection part with 15. In such a configuration, each input terminal 43-4. When a digital signal converted into PCM is applied to each electrode element body 2a to 2e for each bit via e, a sound pressure corresponding to the area is generated from each corresponding acoustic conversion unit 81 to S5, These are combined to reproduce the original audio signal.

However, in the conventional electroacoustic transducer described above, since the lead wire 5 extending from the inside to the outside is provided on each electrode element body 2a to 2d, this lead wire vA5 is used to connect the corresponding acoustic transducer unison. There was a drawback that the vibrations of 1-3l to S4 were restricted and the acoustic characteristics deteriorated.

[Summary of the invention]

In the present invention, each electrode element is biased in one direction around the outer circumference of the diaphragm, the outer electrode element on the biased side is opened, and the lead wire of the inner electrode element is drawn out through this open part. This method eliminates the above drawbacks, and will be explained in detail below using examples.

[Embodiments of the invention]

FIG. 3 is a simplified configuration diagram showing one embodiment of an electroacoustic transducer according to the present invention. In the figure, a diaphragm 1 is provided with an electrode 7 having a shape different from that of the conventional example. The electrode 7 includes a plurality of ring-shaped electrode bodies 7a, 7b, 7c, 7d,
7e, each electrode body gradually becomes larger in diameter so as to surround the inner electrode body, and each electrode body 7a to 7
e is biased in one direction F on the outside of the diaphragm l, a part of the electrode body on the biased side is opened, and the lead wire 8 of the electrode body located on the inside is connected through this open part A. be drawn out. For example, when focusing on the electrode bodies 7b and 70 as shown in FIG. 4, the lead wire 8 of the electrode body 7C 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 has an end A1 on the side of the open part A.
connected to. Each lead wire 8 is connected to an input terminal 9 provided on the outer peripheral portion 1a of the diaphragm 1. 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 evaporation 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 vA8 is pulled out without contacting each electrode body 7a to 7d. Therefore, the vibrations of the corresponding acoustic conversion unit nodes S1 to S4 are not limited (
This improves the acoustic characteristics. In addition, since each electrode body 7a to 7e and each lead wire 8 are integrally formed of the same conductive material, the connection part 6 in the conventional example is eliminated, and the acoustic characteristics are improved as well as the lead wire. There is no need to attach it separately, and the manufacturing process can be reduced.

In the above embodiment, an area-proportional circular drive system is shown, but a drive system using the drive method (11 or (3)) may also be used, and a rectangular drive system as shown in FIG. or may be of various shapes such as an ellipse.In addition, each lead wire 8 may be connected to each electrode body 7.
Although they are integrally formed of the same material as a to 7e, even if they are made of different materials, each lead wire 8 is located outside the outermost acoustic transducer unit S1, so there is almost no deterioration of the acoustic characteristics. Since the lead wires are in the same location, installation is easy.

〔Effect of the invention〕

As explained above, according to the electroacoustic transducer of the present invention, each electrode body is biased in one direction around the outer circumference of the diaphragm, the outer electrode body on the side where the bias is made is opened, and the electrode body is biased through this open portion. Since the lead wire of the inner electrode element body is drawn out from the inner electrode body, vibrations are no longer restricted and the 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. 5 and FIG. 6 are simplified configuration diagrams 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 Masuo Oiwa (2 people)

Claims (2)

[Claims] (1) In an electroacoustic transducer equipped with an electrode facing a diaphragm and consisting of an inner electrode element and an outer electrode element surrounding the electrode element, each electrode element is placed around the outer periphery of the diaphragm. An electroacoustic transducer characterized in that the outer electrode element body is biased in one direction, the outer electrode element body is opened on the biased side, and the lead wire of the inner electrode element 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.