JPH07184292A - Plug device with speaker connection cord - Google Patents

Abstract

PURPOSE:To provide the plug device by which a sound signal and a control signal are connected independently with simple configuration and the reliability of a speaker is secured without deterioration in sound quality. CONSTITUTION:The plug device is a device having a speaker connection cord 10 and plural plug contacts 4a-4d, a remote control switch 8 is provided on the way of the cord 10 and plural connection plug contacts 4a-4c for a sound signal given to speakers 14a, 14b are provided and a ring contact 1 exclusively for a control signal by a remote control switch 8 different from the plug contacts for a sound signal is provided coaxially and the connection plug contacts for sound signal are connected to the speaker via the cord 10 respectively and the connection plug contact exclusively for the control signal is connected to the remote control switch.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a tape recorder and a CD.
The present invention relates to a plug device with a cord for speaker connection, which is effective when applied to headphones used in a player or the like, and which has a cord for speaker connection and has a remote control operation switch in the middle of the cord.

[0002]

2. Description of the Related Art In recent years, a plug device with a speaker connecting cord has been used for headphones connected to a connecting jack installed in a main body of a tape recorder, a CD player or the like, and a voice signal is sent and a remote controller is provided in the middle of the speaker connecting cord. An operation switch is provided, and a control signal is also sent so that the operation of the operation switch can operate the device body such as the tape recorder or the CD player.

An example of the above-described conventional plug device with cord for speaker connection will be described with reference to the drawings.

FIG. 5 shows a circuit block of a conventional plug device with a cord for connecting a speaker. 5, FIG. 5A shows the configuration of the main body of a device such as a tape recorder or a CD player including the connection jack 31, and FIG. 5B shows the configuration of the headphone side including the connection plug 32. The connection plug 32 is of a three-terminal type. The terminal a of the connection jack 31 has a capacitor 3 on the output side of the stereo low frequency power amplifier 33a.
4a, one b terminal is connected to the output side of the other low frequency power amplifier 33b via a capacitor 34b, and the c terminal is connected to the ground. One contact terminal of the remote control changeover switch 35 is connected to the power source through the resistor 36, and the other terminal is connected to the connection jack 31.
Is also connected to the base of a transistor 38 through a resistor 37. The collector of the transistor 38 is connected to the control circuit 3, and the drive control of a device body such as a tape recorder is performed by turning the transistor 38 on and off. Connection plug 3 for headphones
2 and one of the terminals a, b, c of the connection plug 32
And the other is the left and right speakers 42 for headphones.
A headphone cord 40 in which three cords connected to a and 42b are integrated, and a remote control switch 41 is connected between the terminal a of the connection plug 32 and the speaker 42a in the middle of the headphone cord 40.

Headphone connection plugs 32 are inserted into the connection jacks 31 of the main body of the apparatus, and the respective terminals a, b, c are inserted.
When the remote control changeover switch 35 is turned on to enable remote control operation, a direct current flows through the resistor 36 from the audio signal amplified by the low frequency power amplifier 33a and the power source through the speaker 42a. Resistance value R of the resistor 36
Is set to be very large with respect to the DC resistance r of the speaker 42a, the transistor 38 is turned off when the remote control operation switch 41 is on, and when the remote control operation switch 41 is turned off, the resistors 36 and 37 are passed through. A base current flows and the transistor 38 is turned on to input a control signal to the control circuit 39.

[0006]

However, the conventional plug device with a cord for speaker connection as described above superimposes the control signal on the audio signal, so that the superposed minute DC current can improve the sound quality and the reliability of the speaker. There is a problem that the control circuit malfunctions due to the sound signal at the time of deterioration and loud sound.

Further, when the audio signal output circuit is a low frequency power amplifier having a BTL structure, the terminal of the connection jack for connecting the common terminals of the two speakers of the headphone is not at DC ground potential, so that the audio signal is output to the audio signal. It is impossible to superimpose DC current as a control signal. In such a case, conventionally, it has been necessary to provide one connection jack for audio signals and to install a connection jack for control signals separately from the main body of a device such as a tape recorder or a CD player. Therefore, it is very difficult to miniaturize the device body, and it is necessary to similarly provide two connection plugs in the headphones.
There is a problem that not only the operability is significantly impaired, but also the portability is impaired.

In view of the above-mentioned conventional problems, the present invention can independently connect the audio signal and the control signal with a simple structure, so that the sound quality is not deteriorated, the reliability of the speaker is secured, and the size is small. The present invention has been made for the purpose of providing a plug device with a cord for connecting a speaker, which is excellent in terms of efficiency, operability, and portability.

[0009]

In order to solve the above problems, a speaker connecting cord-equipped plug device of the present invention is a plug device having a speaker connecting cord and a plurality of connection plug contacts. And a plurality of connection plug contacts for an audio signal system connected to the speaker, and a control signal system by the remote control operation switch different from the connection plug contact for the audio signal system. A dedicated ring-shaped connection contact is provided coaxially, and a connection plug contact for audio signals is connected to the speaker via the above cords, respectively,
The control signal system dedicated connection contact is connected to the remote control operation switch.

[0010]

According to the present invention, due to the above-mentioned structure, there is no deterioration of sound quality, the reliability of the speaker is secured, the size is reduced, the operability,
A plug device with a cord for connecting a speaker, which is also excellent in portability, is provided.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a speaker connecting cord-equipped plug device of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view of a plug device with a cord for connecting a speaker according to an embodiment of the present invention. In FIG. 1, the connection plug body 6 includes a ring-shaped contact 1 which is partially provided with a connection protrusion 5 formed coaxially with the connection plug 4.
And is incorporated in a device body 9 such as a tape recorder or a CD player, and is inserted into a connection jack 3 in which a base 2 mounted on a printed circuit board 7 for an electric circuit such as a low frequency power amplifier is arranged and connected.

FIG. 2 shows a cross section of the main part in a state in which the connection jack is inserted and connected to the connection plug as described above. The connection jack 3 has audio signal contacts 11a, 11b and 11c which are outputs of the low frequency power amplifier, a first control signal contact 11d and a second audio signal contact 11d which are not used for audio signals on the outermost side of the device body 9. The base 2 which is a control signal contact is integrally formed. On the other hand, the connection plug 6 has audio signal connection terminals 4a, 4b, 4c facing the audio signal contacts 11a, 11b, 11c of the connection jack 3, and a control signal connection terminal 11d and a control signal facing the base 2. The connection terminal 4d and the ring-shaped contact 1 are integrally formed. The ring-shaped contact 1 is provided with a connection protrusion 5 at a key portion of the ring in order to stabilize the connection with the base 2.

FIG. 3 is an external perspective view showing essential parts of the device body and the connection plug. The connection plug 6 provided with the ring-shaped contact 1 forms a plug device having a speaker at its tip and a headphone cord 10 connected to the remote control switch 8 in the middle.

FIG. 4 shows an internal circuit of the device body and a block of headphones. (A) The figure shows the device body 9 side,
(B) The figure shows the headphones side. The audio circuit of the device body 9 is configured by BTL-connecting two low-frequency power amplifiers 15a and 15b and an inverted bass power amplifier 16 that inverts and amplifies only the bass part of the two low-frequency signals. There is. Connection terminals 11a and 11b of the connection jack 3
The connection terminal 11c is connected to the output side of the inverting low-frequency power amplifier 16 for heavy bass enhancement through the capacitors 17a and 17b on the output side of the low-frequency power amplifiers 15a and 15b to form an audio signal output circuit. To do. Furthermore, the connection terminal 11d
Is connected to the power source via the resistor 18, and the base 2 is connected to the base of the transistor 13 via the resistor 19. The collector of the transistor 13 is connected to the input of the control circuit 12 to form a control signal input circuit. On the other hand, the connection terminals 4a and 4b on the side of the connection plug 4 are one terminal of each of the speakers 14a and 14b, and the connection terminal 4c is the speaker 14 described above.
A headphone cord 10 is connected to a portion of a and 14b, which are connected to each other as a common terminal, to form an audio signal system. Further, each terminal of the remote control operation switch 8 installed in the middle of the headphone cord 10 is also connected to the connection terminal 4d and the base 1 by the headphone cord 10 to form a control signal system.

The operation of the speaker connecting cord-equipped plug device configured as described above will be described below.

First, when a connection plug 6 which is a connection terminal for headphones is inserted into the connection jack 3 of a device body 9 such as a tape recorder or a CD player, each connection contact 11
a, 11b, 11c, 11d and base 2, and respective connection terminals 4a, 4b, 4c4d and ring-shaped contact 1
And are connected together. The connection parts thus connected are connected to the connection contacts 11a, 11b, 11c and the connection terminals 4 respectively.
Headphone cord 10 by each connection with a, 4b, 4c
Each terminal of the speaker is independently connected to the low frequency power amplifiers 15a and 15b and the inverting power amplifier 16 to form an audio signal system circuit, and similarly, the connection contact 11d, the base 2 and the connection terminal 4d, the ring-shaped contact. The connection of 1 forms a control signal input circuit of the remote control operation switch 8.

As described above, according to this embodiment, since the audio signal system circuit and the control signal system circuit are completely separated and each connection is coaxial, it can be realized by easy insertion.

Further, in the present embodiment, the control signal system is connected by the ring-shaped contact provided with the connection protrusion, but the connection may be stabilized by the ring-shaped contact having the spring property.

[0020]

As described above, the present invention provides a remote control operation switch in the middle of a cord used for headphones or the like, and controls the operation of the main body such as a tape recorder or a CD player by the operation of the switch. The control signal circuit is connected by a ring-shaped contact on the same axis as the multiple plug contacts that connect the audio circuit system, and the control signal is not sent to the speaker, so the sound quality deteriorates and the reliability of the speaker deteriorates. In addition to the above, it is possible to prevent malfunction of the control circuit due to a sound signal at a high volume. Further, it is possible to provide an excellent plug device with a cord for speaker connection, which does not impair operability that can be connected by inserting one jack, downsizing of a device, and portability.

[Brief description of drawings]

FIG. 1 is a perspective view of a plug device with a cord for connecting a speaker according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the same main part.

FIG. 3 is an external perspective view of an apparatus including the plug device.

FIG. 4 is a circuit block diagram showing a usage example of the plug device.

FIG. 5 is a circuit block diagram using a conventional plug device with a cord for connecting a speaker.

[Explanation of symbols]

1 ring contact 2 base 3 connection jack 4a, 4b, 4c audio signal connection plug contact 4d control signal connection plug contact 11a, 11b, 11c audio signal connection jack connection terminal 11d control signal connection jack connection terminal

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical indication location H04B 10/00 H04R 1/10 104 EF (72) Inventor Tatsuto Mizukami 1006 Kadoma, Kadoma, Osaka Prefecture Address Matsushita Electric Industrial Co., Ltd. (72) Inventor Katsuro Ouchi 1006 Kadoma, Kadoma-shi, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (3)

[Claims] 1. A plug device having a speaker connection cord and a plurality of connection plug contacts, comprising a remote control operation switch in the middle of the cord, and comprising a plurality of audio signal systems connected to the speaker. In addition to providing a connection plug contact, a ring-shaped connection contact dedicated to the control signal system by the remote control operation switch, which is different from the connection plug contact for the audio signal system, is coaxially provided, and for each audio signal through the above code. A plug device with a cord for speaker connection, characterized in that the connection plug contact of is connected to the speaker and the connection contact dedicated to the control signal system is connected to the remote control operation switch. 2. The plug with a cord for speaker connection according to claim 1, wherein the remote control operation switch is connected to a contact not used for an audio signal system and a ring-shaped connection contact among the plurality of connection plug contacts. apparatus. 3. The speaker connection cord according to claim 1, wherein the connection contact dedicated to the control signal system is a ring-shaped contact having a spring property provided integrally with the connection plug for the audio signal system. Plug device.