JPH07288887A - Headphone - Google Patents

Abstract

PURPOSE:To reproduce powerful heavy low sound by transmitting the vibrations of a vibrating member caused by an electric signal to a cabinet as first-order vibrations and generating second-order vibrations at the cabinet so as to transmit the heavy low sounds to the skin together with the tympanum. CONSTITUTION:An electric/acoustic converting device 1 housed in a cabinet 2 converts the electric signal into an acoustic signal, outputs it and supplies a signal with a low-frequency range as a center in the input electric signal of the device 1 to a coil 9. Corresponding to the input signal, the coil 9 vibrates a vibrating member 4 composed of yoke, magnet and plate or the like 4a-4c supported at an elastic supporting member 3. With a vibration pedestal 2f adhering the coil 9 as a fixed part, the resonance frequency of the member 4 is set at 40Hz corresponding to the weight of the entire member 4 and the elastic coefficient of the member 3. Therefore, the member 3 is made of a stainless board, which thickness is 100microns, the surface is coated by silicon, and the damp of resonance is executed so that the vibrations in the low-frequency range can be transmitted to the entire cabinet 2. Thus, the heavy low sounds can be transmitted to the skin together with the tympanum, and the powerful heavy low sounds can be reproduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a headphone which is worn on an ear and is used for personal enjoyment of music, mainly for portable audio equipment.

[0002]

2. Description of the Related Art Headphones are roughly classified into a headband type that is locked to the skull and pressed against the auricle and its surroundings, and an inner ear type that is inserted into and locked in the auricle. Various efforts have been made to reproduce heavy bass.

A conventional headphone will be described below with reference to an example of an inner ear type.

FIG. 8 shows a schematic cross section of a conventional headphone. In FIG. 8, reference numeral 61 is an electroacoustic conversion device for converting an electric signal into an acoustic signal, and 61a is a yoke made of soft iron that serves as a magnetic path of a magnetic circuit and serves as a base for constituting the electroacoustic conversion device. , 61b is a yoke 6
A magnet fixed to 1a and made of neodymium iron or samarium cobalt, 61c is a plate made of soft iron fixed to the magnet 61b to form a magnetic gap with the yoke 61a, and 61d is a copper-plated aluminum wire having a diameter of 50 microns and doubled. A rolled voice coil 61e is a diaphragm formed by heating and shaping a 6 micron polyester film.
Are glued together. Reference numeral 61f is a doughnut-shaped ring formed by pressing a 0.5 mm thick brass plate, and is fixed to the diaphragm 61e and the yoke 61a. 62 is a housing, 62a is a housing, 62b is a unit cap, 62c is a duct cap, and 62d is a rubber bush. The electroacoustic transducer 61 includes a housing 62a.
It is fixed by being sandwiched by the unit cap 62b. In addition, 63 is a stainless steel net, 64 is a cord made of two litz wires coated with vinyl chloride,
Reference numeral 65 is a braking cloth, and 66 is a low-pitched sound port.

An electroacoustic transducer 61 via a cord 64
The electric signal sent to the voice coil 61d receives a force and as a result, the diaphragm 61e produces a moving sound, but the sound produced on the front surface passes through the stainless net 63 through a hole provided in the unit cap 62b. Guided to the ear canal. On the other hand, the sound generated on the back surface is used to control the acoustic frequency characteristic. That is, it is emitted to the outside of the housing 62 through a constant acoustic impedance. The braking cloth 65 attached to the housing 62a is an acoustic resistance component provided for balancing in the direction of attenuating the middle and low ranges with respect to the high range. In particular, in the low frequency range, the acoustic impedance in the low frequency range is lowered by the acoustic L component provided by the U-shaped duct formed by the housing 62a, the duct cap 62c, and the sound port 66 for the low frequency sound, so that the level is increased. .

[0006]

However, in the conventional headphones as described above, even if the deep bass range is boosted to the vicinity of the input limit of the electroacoustic transducer on the amplifier side, it is possible to reproduce only the deep bass of a certain force. In addition, even if the input resistance is increased, the deep bass is only the sound that can be felt by the eardrum, and the heavy force transmitted to the body as when listening to the sound of the stereo set with the deep bass playback device connected. There was a problem that the bass could not be experienced.

The present invention has been made in view of the above conventional problems, and an object thereof is to provide a headphone capable of easily experiencing a powerful bass sound that exceeds the limit of an electroacoustic transducer. .

[0008]

In order to solve the above-mentioned problems, a headphone according to the present invention has an electroacoustic conversion device for converting an electric signal into an acoustic signal, a housing for storing the electroacoustic conversion device, and one end thereof. An electric signal supplied to the electroacoustic transducer, which has an elastic support member fixed to the housing or a base integrated with the housing, and a vibrating member provided at the other end of the elastic support member. The vibrating member is configured to vibrate by an electric signal having a correlation with the vibrating member, and the vibration of the vibrating member is used as a primary vibration so that the primary vibration is transmitted to the housing to generate a secondary vibration in the housing. It is composed.

[0009]

According to the present invention, by virtue of the above-mentioned structure, the vibration synchronized with the acoustic signal generated from the electroacoustic transducer is transmitted to the housing as secondary vibration, and this vibration is directly transmitted to the housing. The sound can be transmitted to the skin such as the auricle that is touching, and at the same time the acoustic signal is transmitted as sound to the eardrum, and at the same time, the vibration of the vibrating member is transmitted to the skin by the vibration having a correlation with the low-frequency component signal, so that the user can feel the low sound This makes it possible to realize powerful bass reproduction that exceeds the limit of the electroacoustic transducer.

[0010]

EXAMPLES Examples of the headphones of the present invention will be described in detail below with reference to FIGS.

FIG. 1 is a schematic cross-sectional view of a headphone according to a first embodiment of the present invention, and FIG. 2 is a view showing a vibration generating portion incorporated in the headphone according to the first embodiment of the present invention (a). Shows a top view, (b) shows a front view, and (c) shows a side view. 1 and 2, 1 is an electroacoustic transducer, 2 is a housing, 2a to 2g are components constituting the housing 2, 2a is a first housing,
2b is the electroacoustic transducer 1 together with the first housing 2a
A unit cap for sandwiching and fixing the base member, 2c a duct cap, 2d a rubber bush, 2e a second housing, 2f a first housing 2a, and a vibration base serving as a base for forming a vibration generating portion. 2g is a rubber ring formed of an elastomer and elastically pressure-bonded to the outer periphery of the unit cap 2b. 3 is 1 on the vibration base 2f
An elastic support member 4 having fixed ends is a vibrating member fixed to the other end of the elastic support member 3, and 4a to 4d are components constituting the vibrating member 4 together with a coil 9 described later. Reference numeral 4a denotes a yoke which is a base for constituting a vibrating member by narrowing down soft iron by pressing and forming a vibrating member. 4b is a magnet fixed to the yoke 4a and made of neodymium iron or samarium cobalt. 4c is a magnet 4b. A plate 4d which is fixed and forms a donut shape by pressing soft iron to form a magnetic gap with the yoke 4a holds the yoke 4a, the magnet 4b and the plate 4c, and fixes the vibrating member 4 to the elastic support member 3. It is a caulking pin.

Reference numeral 5 is a stainless steel net, 6 is a cord containing three litz wires and coated with vinyl chloride, and 7 is for adding a certain acoustic resistance to the sound generated on the back surface of the electroacoustic transducer 1. Braking cloth, 8 is the second housing 2
It is a sound port for bass sound provided in e. Reference numeral 9 is a coil which is adhered to the vibration base 2f and which is formed into a cylindrical shape by double winding an insulating coated copper wire having a diameter of 50 microns, and 10 is fixed to one end of the elastic support member 3 and the vibration base 2f. Screw 11 for fixing the first housing 2a and the second housing 2e and the duct cap 2c, 12 a printed circuit board fixed to the vibration base 2f, and 13 a lead wire of the coil 9. is there. The printed circuit board 12 has terminals 12a and 12b of two lead wires 13 from the coil 9, one terminal 12a being lead wires 13a and 13b to the electroacoustic transducer 1 and the cord 6, and the other terminal 12b. To function as a terminal plate for the lead wire 13c connecting to the cord 6 side.

FIG. 3 is a schematic block diagram showing a circuit configuration for driving headphones according to the first embodiment of the present invention. In FIG. 3, reference numeral 1 is an electroacoustic transducer that obtains acoustic output, and 9 is the coil that constitutes the vibrating member 4 that obtains vibration output. L and R are stereo-input left and right channel electrical signal input terminals, 14 is a left and right independent power amplifier, and 15 is an electrical signal input to the left and right power amplifiers 14 via a secondary low-pass filter. Center power amplifier, 16 is center power amplifier 1
Reference numeral 5 denotes a phase inverting buffer having the output of 5 as an input, and 17 denotes a vibration driver amplifier having the output of the phase inverting buffer as an input. The outputs of the left and right independent power amps 14 are connected to the outputs of the center power amplifier 15 via the left and right electroacoustic transducers 1, respectively. Vibration driver amplifier 1
The output of 7 is common via the left and right coils 9 and is also connected to the output of the center power amplifier 15. As shown in FIG. 3, the second-order low-pass filters have independent first-order low-pass filters connected in series, and the cut-off frequency of each first-order low-pass filter is set to several Hz or less. At the input of the center power amplifier 15 with respect to the input, the phase is inverted at a frequency of 10 Hz or more and 12 dB / Oct. It has the characteristic of having a slope of. Since the output characteristic of the vibration driver 17 is passed through the phase inversion buffer, the output characteristic of the center power amplifier 15 is inverted in phase and has a constant gain, and the frequency characteristic is similar. . That is, the characteristic observation points A, B, C in FIG.
The characteristics in Fig. 4 are (a), (b), and (c) of Fig. 4, respectively.
It is as shown in.

The operation of the headphones constructed as above will be described below. First, as can be seen from the frequency characteristics of (a) and (b) of FIG.
Power amplifier 14 and center power amplifier 1 at 50 Hz
Since the output level of 5 is the same and the phase is inverted, the electric signal applied to both ends of the electroacoustic transducer 1 at 150 Hz becomes BTL drive, and a gain of about 6 dB when compared with a frequency of 1 kHz or higher. At the same time as it goes up, about four times as much power will be supplied. 150Hz
At the frequencies below, the electric signals supplied to both ends of the electroacoustic transducer 1 further increase the gain up amount, and as a result, the electric signal supplied to the electroacoustic transducer 1 is boosted in the low frequency range. Become. On the other hand, the electric signal supplied to both ends of the coil 9 has the characteristic of the difference between the frequency characteristics of FIGS. 4B and 4C. However, since the characteristic of (c) is similar to that of FIG. 4 (b) with a gain difference of about 15 dB, the characteristic of (c) is generally similar to the frequency characteristic of the electric signal supplied to both ends of the coil 9. Become. When a current flows through the coil 9, the coil 9 operates on the same principle as the electroacoustic transducer 1.
Between the coil 9 and the yoke 4a by generating a force between the coil 9 and the yoke 4a by deforming the elastic support member 3 by this force.
The relative distance to a changes. Since the electric signal supplied to the coil 9 is an AC signal centered on the low-pitched sound range as described above, the relative distance between the coil 9 and the yoke 4a changes or vibrates in response to this signal. The amplitude of vibration has a positive correlation with the magnitude of the level of the electric signal supplied to the coil 9.

The resonance frequency of vibration will be described here. Considering the vibration base 2f to which the coil 9 is bonded as the fixed portion side, the resonance frequency of the vibration of the vibration member 4 is determined by the mass of the entire vibration member and the elastic coefficient of the elastic support member 3. In this embodiment, as an example, the comparative listening is repeated so that the most natural effect can be obtained.
It was set to Hz. Therefore, for the elastic support member 3, for example, a stainless steel plate having a thickness of 100 μm is selected, the width of the plate is made nonuniform as shown in FIG. 2A, and the surface thereof is thinly coated with silicon rubber ( (Not shown) to perform resonance Q dump. The vibration in the low frequency range obtained as described above is transmitted to the entire housing 2 via the vibration base 2f, and as a result, the vibration is transmitted to the skin of the auricle with the headphones attached.

As described above, according to the present embodiment, in the earphone of the earphone type which is used by inserting it into the auricle, the inside of the housing for accommodating the electroacoustic conversion device for converting an electric signal into an acoustic signal, An elastic support member having one end fixed to the housing, and a vibrating member provided at the other end of the elastic support member, and the vibrating member according to an electric signal obtained from the electric signal through a low-pass filter. Is configured to vibrate, and as a result, the vibration is transmitted to the housing through the elastic support member, so that it is possible to feel the vibration corresponding to the electric signal in the low range in the skin near the auricle. It is possible to experience a powerful deep bass that exceeds the limit of the electroacoustic transducer.

FIG. 5 is a schematic sectional view showing an example of a band type headphone according to the second embodiment of the present invention.
In FIG. 5, 1 is an electroacoustic transducer, 2 is a housing, 3 is an elastic supporting member, and 4 is a vibrating member. The drive circuit and the operation of this embodiment are the same as those of the first embodiment, and will be omitted.

FIG. 6 is a plan view of the vibration member of the headphones according to the third embodiment of the present invention.
1A and 1B, the elastic support member 3 supporting the vibrating member 4 is used as a plurality of supporting portions, and the vibrating base 2f is formed in an annular shape, and the vibrating member 4 is positioned at the center thereof. It is supposed to be done.

FIG. 7 is a schematic sectional view of a vibrating member of headphones according to a fourth embodiment of the present invention. In FIG. 7, a spacer 2h is placed on a vibrating base 2f.
The vibrating member 4 is supported above and below by a pair of upper and lower elastic support members 3a and 3b sandwiched between the vibrating member 4 and the cover 2i. In the illustrated example, a ring-shaped yoke 4a, a magnet 4b and a plate 4c constituting the vibrating member 4 are provided. Is configured to be supported at two or more places. In this way, by using a plurality of elastic supporting members, the vibration of the vibrating member 4 can be performed more stably.

According to another embodiment, the principle of a piezoelectric element or a magnetic speaker may be applied as a method of converting an electric signal into vibration. Alternatively, an elastic support member may be directly attached to the yoke of the electroacoustic transducer to form a unit. If the mass of the vibrating member is made considerably large and the elastic coefficient of the elastic supporting member is made large at the same time to keep the resonance frequency, the vibration driver amplifier is eliminated and the same electric signal as the electric signal supplied to the electroacoustic transducer is generated. It is also possible to obtain almost the same effect by directly using it as the generated signal.

[0021]

As described above, according to the present invention, an electroacoustic transducer for converting an electric signal into an acoustic signal, a housing for housing the electroacoustic transducer, and one end integrated with the housing or the housing. Of the elastic supporting member and a vibrating member provided at the other end of the elastic supporting member, and the electric signal correlates with the electric signal supplied to the electroacoustic transducer. The vibrating member is configured to vibrate,
The vibration of the vibrating member is used as a primary vibration to generate a secondary vibration in the housing by transmitting the primary vibration to the housing, and has a correlation with an acoustic signal generated from the electroacoustic transducer. The vibration synchronized with the signal can be transmitted to the pinna through the housing, and at the same time the acoustic signal is transmitted to the eardrum as sound, and at the same time, the vibration of the vibrating member is transmitted to the skin by the vibration having the correlation with the bass component signal. This makes it possible to experience bass sounds and realize powerful bass reproduction that exceeds the limits of electroacoustic transducers.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of headphones according to a first embodiment of the present invention.

FIG. 2 is a top view, a front view, and a side view in which a vibration generating portion incorporated in the headphones according to the first embodiment of the present invention is extracted.

FIG. 3 is a schematic block diagram showing a circuit configuration for driving headphones according to the first embodiment of the present invention.

FIG. 4 is a frequency characteristic of a drive circuit for headphones according to the first embodiment of the present invention.

FIG. 5 is a schematic cross-sectional view of headphones according to a second embodiment of the present invention.

FIG. 6 is a plan view showing a supporting state of a vibration member of headphones according to a third embodiment of the present invention.

FIG. 7 is a cross-sectional view showing a supported state of a vibration member of headphones according to a fourth embodiment of the present invention.

FIG. 8 is a schematic cross-sectional view of conventional headphones.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electroacoustic transducer 2 Housing 3 Elastic support member 4 Vibration member

Claims (5)

[Claims] 1. An electroacoustic transducer for converting an electrical signal into an acoustic signal, and a housing for housing the electroacoustic transducer.
An elastic supporting member having one end fixed to the housing or a base integrated with the housing, and a vibrating member provided at the other end of the elastic supporting member are supplied to the electroacoustic transducer. The vibrating member is configured to vibrate by an electric signal having a correlation with the electric signal, and the vibration of the vibrating member is used as a primary vibration to transmit the primary vibration to the housing, thereby generating a secondary vibration in the housing. Headphones characterized by being configured as described above. 2. A vibrating member having a fixed mass added thereto, and a resonance frequency of vibration determined by the total mass of the vibrating member and an elastic coefficient of the elastic supporting member is determined in advance, so that the primary vibration of the vibrating member is effectively produced. The headphones according to claim 1, wherein the headphones are configured to be transmitted to the body. 3. The secondary vibration generated in the housing is a vibration sufficient to be sensed by the human body through the skin in contact with the housing.
The listed headphones. 4. The elastic supporting member for supporting the vibrating member is plural, and the elastic supporting member is plural.
The listed headphones. 5. A resonance frequency is set to a low frequency, a filter for extracting a low frequency component of an electric signal is provided, and the electric signal taken out through this filter is supplied to the vibrating member. Claim 2, 3 or 4
The listed headphones.