JP2014107658A - Headphone - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a headphone enabling three or more persons to hear the same sound at the same time, without using an audio signal distributor or a device of wireless connection type.SOLUTION: A headphone 1 includes: an input terminal 11 that inputs an audio signal; a speaker 13 that converts the audio signal inputted from the input terminal 11 into sound and emits the sound; an amplifier 14 that amplifies the audio signal inputted from the input terminal 11; and three or more output terminals 12, 21, 22, 31, and 32 that are connected in parallel to the amplifier 14 and output the audio signal amplified by the amplifier 14.

Description

  The present invention relates to a headphone having a function that allows a plurality of people to listen to the same sound at the same time.

  Recently, portable audio players that reproduce audio files (hereinafter simply referred to as audio players) have become widespread. An audio player usually has one stereo mini jack as an audio output terminal, and a stereo mini jack of a headphone is connected to the stereo mini jack so that sound such as music can be heard alone.

  A user of an audio player may want to enjoy sound with a friend. At this time, by connecting the audio signal distributor to the stereo mini jack of the audio player and connecting the stereo mini plugs of the two headphones to the audio signal distributor, two people can listen to the same sound at the same time. Patent Document 1).

  Some audio players transmit audio signals to headphones using a wireless connection method such as Bluetooth (registered trademark). In such an audio player, sound can be heard with headphones selected as an output destination among a plurality of paired headphones (see Patent Document 1).

JP 2004-128673 A

Sanwa Supply Co., Ltd./Audio distribution adapter (Black) Product number: MM-AD22BK, [online], [Searched on November 7, 2012], Internet <URL: http://www.sanwa.co.jp/product/ syohin.asp? code = MM-AD22BK & cate = 1>

  An audio player user may also want to enjoy sound together with a plurality of people (three or more). At this time, a plurality of headphones can be connected by preparing a plurality of audio signal distributors described in Non-Patent Document 1 and connecting them in a daisy chain.

  However, with this connection method, the output impedance decreases as the number of connected headphones increases, and the volume of each headphone decreases. In addition, a plurality of audio signal distributors must be prepared, and preparation and management of the audio signal distributors are complicated.

  Also, in the case of a Bluetooth audio player as described in Patent Document 1, it is impossible to listen to sound simultaneously with a plurality of headphones. Further, as described in Patent Document 1, the wireless connection between the audio player and the headphones may be suddenly disconnected during the reproduction of the sound due to the surrounding environment. Therefore, there arises a problem that some of a plurality of users cannot listen to the sound.

  Therefore, an object of the present invention is to provide a headphone configured so that three or more people can listen to the same sound at the same time without using an audio signal distributor or a wireless connection type device.

  The headphones of the present invention include an input terminal, an amplifier, a speaker, and a plurality of output terminals. An audio signal is input to the input terminal. The amplifier amplifies the audio signal input from the input terminal. The speaker converts the audio signal amplified by the amplifier into sound and emits the sound. The plurality of output terminals output audio signals amplified by the amplifier.

  The headphones of the present invention include an input terminal, a speaker, an amplifier, and a plurality of output terminals. An audio signal is input to the input terminal. The speaker converts the audio signal input from the input terminal into sound and emits the sound. The amplifier amplifies the audio signal input from the input terminal. The plurality of output terminals output audio signals amplified by the amplifier.

  In this configuration, the headphones have a plurality of (two or more) output terminals, and each output terminal outputs an audio signal amplified by an amplifier. Therefore, by connecting an audio player to the input terminals and headphones to each output terminal, three or more people can listen to the same sound at the same time without using an audio signal distributor or a wireless connection device. In addition, since multiple headphones of the type that are connected by cable are connected to the headphones to which the audio player is connected, the sound is not interrupted regardless of the surrounding environment, and there is a sense of security that the cables are actually connected by cables. Can be given to the user.

  In the above invention, the output terminal may be provided in a housing for housing the speaker, a band for fixing the housing to the head, or an adapter connected to a signal line extending from the housing.

  In this configuration, an output terminal to which another headphone is connected can be selected according to the use situation of the user's headphone or the number of headphones to be connected, and a cable for connecting the headphone can be routed to the user according to preference. .

  In the above invention, when a dummy resistor is provided at the output terminal and an external device connector that outputs an audio signal is inserted, the amplifier is connected to this connector. When this plug is not inserted, the amplifier is connected to the dummy resistor. You may make it do.

  In this configuration, even if the number of headphones connected to the output terminal changes, the impedance variation can be suppressed by the dummy resistor, so that the sound quality and volume can be prevented from changing according to the number of headphones connected.

  According to the present invention, three or more people can listen to the same voice at the same time without using a voice signal distributor or a wireless connection device.

1 is an external perspective view of a headphone according to an embodiment of the present invention. External view (bottom view) of the headphones viewed from the direction of arrow A shown in FIG. External view (top view) of the headphones viewed from the direction of arrow B shown in FIG. 1 is a circuit diagram of a headphone according to a first embodiment of the present invention. Circuit diagram of headphones according to a second embodiment of the present invention External appearance perspective view of headphones according to a third embodiment of the present invention. Circuit diagram of headphones according to a third embodiment of the present invention The circuit diagram of the headphones concerning a 4th embodiment of the present invention. External appearance perspective view of headphones according to a fifth embodiment of the present invention. Circuit diagram of headphones according to a fifth embodiment of the present invention

  Hereinafter, headphones according to embodiments of the present invention will be described with reference to the drawings. This headphone has an input terminal for connecting a source device such as an audio player and two or more output terminals for connecting other headphones, so that three or more people can listen to the same sound at the same time. In the following description, overhead stereo headphones having a headband will be described as an example of headphones.

  First, the configuration of the headphones will be described. FIG. 1 is an external perspective view of a headphone according to an embodiment of the present invention. 2 is an external view (bottom view) of the headphones as viewed from the direction of arrow A shown in FIG. FIG. 3 is an external view (top view) of the headphones viewed from the direction of arrow B shown in FIG.

  The headphone 1 has a structure in which left and right housings 10 and 20 are connected to both ends of a band 30 via arms 15 and 25, respectively.

  The band 30 is made of an elastic band-shaped resin or metal curved in a semicircular shape, connects the left and right housings 10 and 20, and is locked to the head when the user wears the headphones 1. . A cable 40 is wired inside the band 30.

  The left and right housings 10 and 20 have a cylindrical shape having bottom surfaces on the inner side (semicircular) and the outer side (semicircular) of the band 30, the outer bottom surface is sealed, and the inner bottom surface is open. Shape. Speakers 13 and 23 are provided inside the left and right housings 10 and 20 toward an opening surface (inner bottom surface), respectively. The left and right housings 10 and 20 are arranged so that the opening surfaces face each other. The speaker 13 emits L channel sound, and the speaker 23 emits R channel sound.

  An audio signal input terminal 11 and an audio signal output terminal 12 are provided at the lower part of the outer periphery of the left housing 10. Audio signal output terminals 21 and 22 are provided at the lower part of the outer periphery of the right housing 20. The input terminal 11 is a stereo mini jack, for example, and is connected to the audio player 101 via the audio cable 51. The output terminals 12, 21, 22 are, for example, stereo mini jacks, and are connected to other headphones 111 via audio cables 52, 53, 54, respectively (see FIG. 4).

  Next, a circuit built in the headphones 1 will be described. FIG. 4 is a circuit diagram of the headphones according to the first embodiment of the present invention. A stereo amplifier 14 is connected to the input terminal 11. The stereo amplifier 14 is a circuit that amplifies the audio signal input from the input terminal 11. The stereo amplifier 14 has an input impedance (for example, 32Ω) substantially equal to that of general headphones, and the output impedance is lower than this. On the output side of the stereo amplifier 14, an L channel speaker 13, an R channel speaker 23, and output terminals 12, 21, and 22 are connected in parallel. The R channel speaker 23 and the output terminals 21 and 22 are connected to the stereo amplifier 14 via the cable 40. The cable 40 includes an R channel line (R) that transmits an R channel signal, an L channel line (L) that transmits an L channel signal, and a ground line (G). The ground line may be a shield net. The speakers 13 and 23 convert the audio signal amplified by the stereo amplifier 14 into sound and emit the sound. Each output terminal 12, 21, 22 outputs an audio signal amplified by the stereo amplifier 14. The stereo amplifier 14 is operated by the power of the battery built in the headphones 1, but may be operated by receiving power supply via the audio cable 51.

  When the user listens to the sound of the audio player 101 alone using the headphones 1, the stereo mini plug of the audio cable 51 connected to the audio player 101 is connected to the input terminal (stereo mini jack) 11 of the headphones 1. . The user can listen to the sound amplified by the stereo amplifier 14 through the speaker 13 and the speaker 23 by wearing the headphones 1 in both ears and operating the audio player 101 to start reproducing the sound.

  Further, when the user listens to the same sound with a plurality of people using the headphones 1, the audio player 101 is connected to the input terminal 11 of the headphones 1, and the output terminal (stereo mini jack) of the headphones 1 is connected. Connect the stereo mini plug (connector) of other headphones. When four users listen to the same voice together, as shown in FIG. 4, the audio player 101 is connected to one input terminal 11 provided on the headphone 1, and three output terminals 12, 21, 22 are connected to headphones 111 to 113, respectively.

  The user listens to the sound by connecting the audio player 101 and the headphones 111 to 113 to the headphone 1 as described above, then wearing the headphones 1 in both ears, and operating the audio player 101 to reproduce the sound. be able to. Also, the other three users can listen to the same sound amplified by the stereo amplifier 14 together with other users by wearing any of the headphones 111 to 113 respectively.

  Next, a headphone circuit according to a second embodiment of the present invention will be described. FIG. 5 is a circuit diagram of a headphone according to the second embodiment of the present invention. The headphone 2 shown in the figure is the same as the circuit shown in FIG. 4 except that the connection form of the speakers 13 and 23 is different from the headphone 1 shown in FIG. 5, parts having the same configuration as in FIG. 4 are denoted by the same reference numerals, and differences from the configuration of FIG. 4 will be described below.

  As shown in FIG. 5, a stereo amplifier is connected to the input terminal 11 as in the circuit of FIG. 4, and an L-channel speaker 13 and an R-channel speaker 23 are connected. That is, the L channel speaker 13 and the R channel speaker 23 are directly connected to the input terminal 11 without passing through the stereo amplifier 15. Three output terminals 12, 21, and 22 are connected to the output side of the stereo amplifier 15. Among these, the output terminals 21 and 22 are connected to the stereo amplifier 15 via the cable 40. Further, a cable 41 for connecting the input terminal 11 and the R channel speaker 23 is further built in the band 30. The stereo amplifier 15 may have a higher input impedance (for example, about 100Ω) than the stereo amplifier 14 shown in FIG. The input impedance may be determined in consideration of the impedance of the speakers 13 and 23.

  With the above configuration, in the headphones 2, the audio signal output from the audio player 101 is directly emitted from the speakers 13 and 23 without being amplified. Thereby, the user of the headphones 2 can listen to the sound based on the raw audio signal output from the audio player 101. Further, when the user of the headphones 2 enjoys the audio alone, the headphones 2 can be used as passive headphones without activating the stereo amplifier 15.

  Next, headphones according to a third embodiment of the present invention will be described. FIG. 6 is a circuit diagram of a headphone according to the third embodiment of the present invention. 6, parts having the same configuration as in FIG. 4 are denoted by the same reference numerals, and differences from FIG. 4 will be described.

  In the headphones 3 of this embodiment, as shown in FIG. 6, output terminals 12, 21, and 22 that connect other headphones 111 to 113 are stereo mini jacks with contact terminals, and between each contact terminal and the ground. A dummy resistor R is connected. Other configurations are the same as those of the circuit shown in FIG.

  With the above configuration, the output terminals (stereo mini jacks) 12, 21, 22 connect the output terminal of the stereo amplifier 14 and this stereo mini plug when the stereo mini plugs of the other headphones 111, 112, 113 are inserted. The audio signal is output to the other headphones 111, 112, 113 by connecting. On the other hand, when the stereo mini plugs of the other headphones 111, 112, and 113 are not inserted, the R terminals and L terminals of the output terminals 12, 21, and 22 are connected to the dummy resistors via the contact terminals. Since the other end of the dummy resistor is grounded, the audio signal is consumed with the dummy resistor as a load, and fluctuations in output impedance can be suppressed regardless of whether other headphones 111, 112, and 113 are connected.

  The dummy resistor may have the same impedance (for example, 32Ω) as the headphones connected to the output terminals 12, 21, 22, or may have a higher impedance (for example, about 100Ω).

  FIG. 7 is an external perspective view of a headphone according to a fourth embodiment of the present invention. FIG. 8 is a circuit diagram of a headphone according to the fourth embodiment of the present invention. The headphones 4 according to this embodiment are different in appearance from the headphones 1 shown in FIG. 7 and 8, parts having the same configuration as in FIGS. 1 and 4 are denoted by the same reference numerals, and differences from FIGS. 1 and 4 will be described.

  As shown in FIG. 7, the headphone 4 has a configuration in which a terminal adapter 70 is connected to the right housing 20 via a cable 42. The terminal adapter 70 has two output terminals 71 and 72. On the other hand, the left and right housings 10 and 20 do not include output terminals. Other headphones 111 and 112 are connected to the output terminals 71 and 72. The cable 42 is a flexible shielded cable having a length of about 40 cm, and the terminal adapter 70 is about the size of a so-called USB memory.

  As shown in FIG. 8, the left channel speaker 13 and the cable 40 are connected to the input terminal 11. A right channel speaker 23 and a cable 42 are connected to the other end of the cable 40. The cable 42 is connected to the stereo amplifier 16 of the adapter 70. The stereo amplifier 16 amplifies the audio signal input from the cable 42 and outputs the amplified audio signal to the output terminals 71 and 72. The output terminals 71 and 72 are connected in parallel to the stereo amplifier 16.

  When the user listens to the sound alone using the headphones 1, the plug of the audio cable 51 connected to the audio player 101 is connected to the input terminal 11 as with the headphones 1. The user can listen to the sound through the speaker 13 and the speaker 23 by operating the audio player 101 to reproduce the sound.

  In addition, when a user listens to sound using a headphone 1, a maximum of three users can be connected by connecting the other headphones 111 and 112 to one or both of the two output terminals 71 and 72 of the terminal adapter 70. Can hear the same voice together.

  With the above configuration, even when other headphones 111 and 112 are connected, the other headphones are not directly connected to the housings 10 and 20, so there is no annoyance. In addition, since the cable 42 is a flexible shielded cable and the terminal adapter 70 is about the size of a USB memory, when the other headphones 111 and 112 are not connected, the user stores the terminal adapter 70 in, for example, a breast pocket. Thus, the headphones 4 can be used without the terminal adapter 70 getting in the way.

  Note that the cable 42 and the terminal adapter 70 may be detachable from the right housing 20. Further, the stereo amplifier 16 may be provided on the housing 10 or 20 side.

  As described above, with the headphones of the present invention, three or more people can hear the same sound. In addition, since the audio signal is amplified by the stereo amplifier 14 (15, 16), even if a plurality of headphones are connected to the headphones 1, it is possible to prevent a decrease in volume of sound emitted from each headphone. Also, since the audio player 101 and the other headphones 111 to 113 are connected by wire via the headphones 1 (2, 3, 4), there is no problem that the sound is interrupted during the sound reproduction regardless of the surrounding environment. .

  In the first to third embodiments, three output terminals are provided, and in the fourth embodiment, two output terminals are provided. However, the number of output terminals is not limited. Further, the location where the output terminal is provided is not limited to the housing 10 or 20 or the terminal adapter 70. For example, as shown in FIGS. 9 and 10, output terminals 31 and 32 may be provided in the band 30 to increase the number of output terminals.

DESCRIPTION OF SYMBOLS 1-4 ... Headphones 10, 20 ... Housing 11 ... (Signal) input terminal 12, 21, 22, 31, 32, 71, 72 ... (Signal) output terminal 13, 23 ... Speaker 15, 25 ... Arm 30 ... Band 40 ... 42 ... Cable 51 ... Audio cable 70 ... Terminal adapter 101 ... Audio player 111 to 113 ... Other headphones

Claims (6)

An input terminal to which an audio signal is input;
An amplifier for amplifying an audio signal input from the input terminal;
A speaker connected to the amplifier for converting the audio signal amplified by the amplifier into sound and emitting the sound;
A plurality of output terminals connected to the amplifier and outputting an audio signal amplified by the amplifier;
With headphones. An input terminal to which an audio signal is input;
A speaker that converts the audio signal input from the input terminal into sound and emits the sound;
An amplifier for amplifying an audio signal input from the input terminal;
A plurality of output terminals connected to the amplifier and outputting an audio signal amplified by the amplifier;
With headphones. A housing for housing the speaker;
The headphone according to claim 1, wherein the output terminal is provided in the housing. A housing for housing the speaker;
A signal line extending from the housing;
An adapter connected to the signal line;
With
The headphone according to claim 1, wherein the output terminal is provided on the adapter. A band for fixing the housing to the head;
The headphone according to claim 1, wherein the output terminal is provided in the band.   The output terminal has a dummy resistor, and when a connector of another external device is inserted, the connector is connected to the amplifier, and when the plug is not inserted, the dummy resistor is connected to the amplifier. The headphone according to any one of claims 1 to 5.

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