JP2002330485A - Acoustic equipment and noise canceling headphones - Google Patents

Abstract

(57) [Summary] An object of the present invention is to make it unnecessary to adjust an electric circuit or the like every time an input code or the like is replaced. SOLUTION: A housing part 1 provided so as to cover a part for determining acoustic characteristics including a noise canceling part, a terminal part 7 of an electric circuit in the housing part 1 provided outside the housing part 1, It comprises a cap 4 provided so as to cover the terminal portion 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an acoustic device and a noise canceling headphone suitable for use in, for example, an aircraft.

[0002]

2. Description of the Related Art Generally, a noise canceling headphone used in an aircraft or the like is designed to reduce an ambient noise by adjusting an electric circuit in accordance with acoustic characteristics determined by a housing and a front panel. .

[0003]

By the way, conventionally, when it is necessary to replace the input cord in the noise canceling headphones, it is necessary to disassemble the housing which is the housing of the noise canceling headphones. When the housing is disassembled and assembled again, the acoustic characteristics determined by the housing and the front panel change.

Therefore, when the housing of the conventional noise canceling headphones is disassembled and assembled, there is a disadvantage that the electric circuit and the like must be adjusted each time.

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to eliminate the need to adjust an electric circuit or the like every time an input code or the like is replaced.

[0006]

According to the present invention, there is provided an acoustic device comprising: a housing portion provided so as to cover a portion for determining acoustic characteristics;
It comprises a terminal portion of an electric circuit in the housing portion provided outside the housing portion, and a cap provided to cover the terminal portion.

According to the present invention, since the terminal portion is provided outside the housing portion, it is not necessary to disassemble the housing, for example, when exchanging the input cord, and it is not necessary to adjust the electric circuit and the like each time. May be.

The noise canceling headphone according to the present invention includes a housing portion provided so as to cover a portion for determining acoustic characteristics including a noise canceling portion, and a terminal portion of an electric circuit in the housing portion provided outside the housing portion. And a cap provided so as to cover the terminal portion.

According to the present invention, since the terminal is provided outside the housing, the housing does not need to be disassembled when the input cord is replaced, and each time the electric circuit and the like are not adjusted. May be.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a noise canceling headphone according to the present invention will be described with reference to the drawings.

FIG. 1 and FIG. 2 show the external appearance of the noise canceling headphones, and 1 shows a housing formed by fixing an outer housing 3 to a front plate 2 with screws 3a, 3a. A structure as shown in FIG.

Referring to FIG. 5, reference numeral 20 denotes an audio signal input terminal to which an audio signal is supplied. This audio signal input terminal 20 is connected to a sound quality correcting equalizer circuit 21 and a resistor 22 via a series circuit. It is connected to one input terminal of the adder circuit 23.

Reference numeral 24 denotes a microphone that picks up external sounds. The microphone 24 is connected to the other input terminal of the addition circuit 23 via a filter 25 whose phase and volume can be adjusted. Output terminal is amplifying circuit 2
6 is connected to one input terminal of a speaker 27, and the other input terminal of the speaker 27 is grounded via a ground terminal 28.

Reference numeral 29 denotes a DC power supply terminal. The DC power supply from the DC power supply terminal 29 is supplied to the microphone 24 via the resistor 30, and the DC power is supplied to the filter 25 and the amplifier circuit 26, respectively. I will do it.

In the electric circuit as shown in FIG.
The noise picked up by the microphone 24 is inverted by the filter 25 so that the noise in the opposite phase is emitted from the speaker 27 to cancel the noise and reduce the noise.

Further, the housing portion 1 is configured to obtain an acoustic effect, and the acoustic characteristics of the noise canceling headphones are determined in the housing portion 1.

In FIG. 1, reference numeral 4 denotes a cap constituting a part of the housing of the noise canceling headphone. The cap 4 is fixed to the front plate 2 with screws 4a, 4a.

In this embodiment, when the input cord 5 is inserted through the cap 4 and the cap 4 is removed, as shown in FIG. 7, that is, five terminals 7a, 7b... 7e of the wiring board 6 provided with the electric circuit are exposed to the outside of the housing portion 1.

In this case, the rib 3b provided on the outer casing 3 is
Since the terminals 7a, 7b,..., 7e are exposed so as to come into contact with the wiring board 6 and the front panel 2, stable acoustic characteristics can be obtained between the outer casing 3 and the front panel 2. The housing part 1 to be determined is configured. In this example, the rib 3b is a part of the outer casing 3, but it is needless to say that the ribs 3b may be prepared as separate members and assembled to have the same configuration.

The five terminals 7a, 7b... 7e are connected to, for example, a left signal input terminal, a right signal input terminal, and a ground terminal of the input cord 5 such as a DC power input terminal of 3 to 15 V and a battery terminal. It is configured so that

FIG. 4 is a sectional view of the concept of the noise canceling headphones shown in FIGS.

Since the present embodiment is constructed as described above, when the input cord 5 needs to be replaced, the screw 4
a, 4a are removed, the cap 4 is removed, and the terminals of the input cord 5 are replaced by soldering or the like, respectively, and then the cap 4 is fixed to the front plate 2 with screws 4a, 4a. In this case, the housing portion 1 composed of the front plate 2 and the outer housing 3 is not affected by the ribs 3b. That is, the input code 5 is not affected acoustically.
Can be replaced.

Therefore, according to the present embodiment, the terminals 7a, 7b... 7e of the terminal portion 7 provided outside the housing portion 1 can be replaced only by removing the cap 4 to replace the input cord 5.
The terminal can be exchanged by connecting a predetermined terminal of the input cord 5, and there is no need to disassemble the housing part, and it is not necessary to adjust an electric circuit or the like every time.

Although the above embodiment has been described with reference to the case where the present invention is applied to a noise canceling headphone, it is also possible to apply a housing provided so as to cover a portion for determining acoustic characteristics to a speaker or other acoustic device. Of course, you can.

In the above-described example, the screws 4a, 4a are used to attach the cap 4. However, if the cap 4 can be removed, the fixing need not be screws.

In the above-described example, an example in which the input code 5 is replaced has been described. However, the present invention may be applied to a case where another code is replaced or a part is replaced.

In the above-described example, the terminal portion 7 and the cap 4 covering the terminal portion are provided at one place, but it is needless to say that a plurality of places may be provided.

Further, in the above-described example, the cap 4 is described as covering only the terminal portion 7, but the cap 4 may cover the entire housing portion 1 and the terminal portion 7 as shown in FIG. In this case, it is needless to say that the same operation and effect as described above can be obtained.

Further, the present invention is not limited to the above-described example, and may adopt various other configurations without departing from the gist of the present invention.

[0030]

According to the present invention, the terminal portion is provided outside the housing portion provided so as to cover the portion for determining the acoustic characteristics. Therefore, it is necessary to disassemble the housing portion when exchanging the input cord, for example. There is an advantage that it is not necessary to adjust the electric circuit and the like each time.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing an example of an embodiment of a noise canceling headphone according to the present invention.

FIG. 2 is an external perspective view of the inside of FIG.

FIG. 3 is a perspective view showing a state where a cap of FIG. 1 is removed.

FIG. 4 is a conceptual sectional view of an example of an embodiment of the present invention.

FIG. 5 is a configuration diagram of an example of a noise canceling headphone.

FIG. 6 is a conceptual sectional view of another example of the embodiment of the present invention.

[Explanation of symbols]

1 housing, 4 cap, 5 input cord, 6 wiring board, 7 terminal, 7a, 7b ... 7
e ‥‥ terminal

Claims (4)

[Claims] 1. A housing portion provided to cover a portion for determining acoustic characteristics, a terminal portion of an electric circuit in the housing portion provided outside the housing portion, and a cap provided to cover the terminal portion. An acoustic device, comprising: 2. A housing portion provided to cover a portion for determining acoustic characteristics including a noise canceling portion, a terminal portion of an electric circuit in the housing portion provided outside the housing portion, and covering the terminal portion. A noise canceling headphone comprising a cap provided as described above. 3. The noise canceling headphone according to claim 2, wherein the cap can be detached independently. 4. The noise canceling headphone according to claim 2, wherein the terminal portion has a connection terminal for an input cord.