JP3791978B2 - Open headphones - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an open-type headphone, and more specifically, relates to an open-type headphone that allows a user to obtain a good wearing feeling and an open-type headphone that can correct a low sound range.
[0002]
[Prior art]
FIG. 9 shows an open type headphone 90 (see Japanese Utility Model Laid-Open No. 58-189691: Conventional Example 1). This open-type headphone 90 includes a headband 91 and a pair of headphone units 92 and 92 supported at both ends of the headband 91. The headphone units 92 and 92 each have a built-in electroacoustic transducer (not shown) and baffle surfaces 93 and 93.
[0003]
This open type headphone 90 has a user's side at both ends of the headband 91 in order to form a free sound field between the baffle surfaces 93 and 93 and the user's ear (not shown). Contact members 94, 94 that can contact the head are provided. The contact members 94 and 94 are formed in a substantially U-shape like a vine of glasses, and are arranged closer to the axis of the headband 91 than the baffle surfaces 93 and 93 of the headphone units 92 and 92.
[0004]
Therefore, in the use of the open type headphone 90, the headband 91 is elastically deformed so that the radius becomes small, so that the abutting members 94, 94 are pressed against the user's temporal region and are engaged with the base of the ear. Thus, a free sound field can be formed between each baffle surface 93, 93 and the user's ear.
[0005]
[Problems to be solved by the invention]
By the way, the above-described open-type headphone 90 has a shape and form in which the abutting members 94 and 94 resemble a vine of glasses, so that there is little possibility of sliding off from the root of the user's ear. Since the members 94 and 94 press the user's temporal region, there is a problem that some users feel pain and cannot withstand long-time use.
[0006]
In general, open-type headphones have a problem in that sound leakage from a free sound field is unavoidable due to its structure, and the sound pressure of bass sounds is reduced. To solve this problem, an open-type headphone that corrects the low frequency range by using a speed-type acoustic transducer (conventional example 2), or an open-type headphone that increases the low frequency by using an amplifier (conventional example 3). An open type headphone (see Japanese Patent Application Laid-Open No. 7-288887: Conventional Example 4) that artificially compensates for the low sound range by using a vibration converter has been proposed.
[0007]
However, the conventional example 2 employs a speed-type acoustic transducer that is less efficient than a pressure-type acoustic transducer, and therefore cannot effectively correct the low frequency range. There is a problem that the weight increases because it is necessary. Further, the conventional example 3 has a problem that the sound quality changes as the low frequency increases, and the weight increases due to the amplifier. Furthermore, the conventional example 4 has a problem that a natural sound quality cannot be obtained because the insufficient low frequency range is corrected not as air vibration but as vibration of the main body.
[0008]
The present invention has been made in order to solve the conventional problems such as those described above. The first object of the present invention is to provide an open-type headphone that allows a user to obtain a good wearing feeling for a long time. A second object is to provide an open type headphone that can naturally correct the low frequency range without causing an increase in weight.
[0009]
[Means for Solving the Problems]
In general, it is known that when a part that inhibits movement of joints and muscles is compressed in a human body, discomfort and fatigue are increased as compared with the case where other parts are compressed.
Therefore , the present invention for achieving the first object has been made by paying attention to the fact that compression of the temples and the muscles behind the ears increases discomfort and fatigue.
[0010]
In other words, in order to achieve the first object, the invention described in claim 1 includes a headband and a headphone unit supported by the headband and including an electroacoustic transducer, and the headphone to form a free-field between the baffle surface and the user's ear units, in an open type headphones capable of abutting contact member is provided on the side of the head of the user, the abutting member state but which enclose the top portion side of the ear, and is formed on the baffle surface of the headphone unit as a substantially C-shaped to be engaged with the ear, the abutment member is engaged with the ear in the one end of the contact member is disposed on the top portion side of the temple of the user, the other end of the abutment member is perpendicular to the line connecting the said top portion and cavum conchae And through the concha Disposed on the top portion side of the line of, and acoustic emission axis of the electro-acoustic transducer is characterized in that it is configured to match with the cavity of the concha.
[0011]
In this case, as the contact member, a structure formed in a belt shape that continuously contacts the user's temporal region or a structure in which a plurality of button-like pads are arranged in a C shape at a predetermined interval is adopted. it can. When the contact member is formed in a band shape, it is not necessary to be curved with a constant curvature, and may be curved in an elliptical arc shape so long as the ear top side is surrounded. Furthermore, in order to correspond to the use for's head shape, or allowed to form irregularities in the thickness direction, it may be provided with suitable notches or the like.
[0012]
In the invention described in claim 1, since the contact member is formed in a substantially C shape surrounding the top of the ear, the contact member is engaged with the ear as in the prior art. However, when pressed, the feeling of discomfort and fatigue increases and the abutment member abuts the temporal region avoiding the temples and the muscles behind the ears. It will be obtained over time, thereby achieving the first objective.
[0013]
Few Also, before SL because the abutment member is that provided in the baffle surface of the headphone unit, for example a component as compared with the case where the contact member is provided on the headband through an appropriate connecting member And the baffle surface can be arranged at a desired position reasonably close to the user's ear.
[0014]
On the other hand, in order to achieve the second object, the invention described in claim 2 is the electroacoustic transducer according to claim 1 , wherein a weight part for setting a low-frequency resonance frequency in a range of 70 Hz to 200 Hz is provided. In addition, the weight part is provided with metal particles fixed to the diaphragm with an adhesive .
[0015]
In the invention described in claim 2 of this, since the low band resonance frequency of the diaphragm is set to to no 70 Hz 200 Hz by the addition heavy, that bass of shortage is corrected without causing unnatural feeling Become. In addition, since an extremely simple structure in which an additional weight is provided on the diaphragm to correct the low frequency range, the problem that the weight of the headphone unit increases significantly as in the past can be solved. Thus, the second object is achieved.
[0016]
Further, since the weight part (additional weight) has metal particles fixed to the diaphragm via an adhesive, the particle size and number of metal particles, the amount of adhesive, the material, etc. are appropriately set. By selecting, the low sound range can be corrected easily and freely.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows an embodiment according to the present invention. As shown in FIG. 1A, an open type headphone 10 according to the present embodiment includes a headband 11 and a pair of headphone units 12 (only one is shown) supported at both ends of the headband 11. ing.
An electroacoustic transducer (not shown) is housed in the housing of the headphone unit 12, and the headphone unit 12 is free between the baffle surface 13 and the ear 15 of the user's head 14. In order to form the sound field 16, an abutting member 20 capable of abutting on the user's temporal region 14A is provided.
[0018]
The contact member 20 is formed in a substantially C shape by, for example, bending a urethane pad having a predetermined thickness with a certain curvature, and surrounds the top portion 14B side of the ear 15 when the open type headphone 10 is used. , Attached along the baffle surface 13.
As shown in FIG. 1 (B), one end 20A of the abutting member 20 is arranged on the side of the crown 14B from the user's temple A, and the other end 20B is between the concha cavity 15A and the parietal portion 14B. Is arranged so as to be arranged on the parietal portion 14B side with respect to the line C passing through the concha cavity 15A.
[0019]
The contact member 20 is arranged so that the acoustic emission axis D of the electroacoustic transducer coincides with the concha cavity 15A when the user appropriately wears the open headphone 10 to the head 14. It is arranged with respect to the baffle surface 13.
Therefore, as shown in FIG. 2, when the user wears the open type headphone 10 of this embodiment on the head 14 (see FIG. 2A), the contact member 20 is caused by the weight of the headphone 10 by the user. Is guided along an inner peripheral surface 20C that contacts the ear 15 (see FIG. 2B), and the acoustic emission axis D of the electroacoustic transducer coincides with the concha cavity 15A (FIG. 2). (See (C)).
[0020]
According to the open type headphone 10 of the present embodiment, since the contact member 20 is formed in a substantially C shape surrounding the head 15A side of the ear 15, the contact member 20 engages with the ear 15 and slides down. There is no fear, and the free sound field 16 formed between the user's ear 15 and the baffle surface 13 of the headphone unit 12 can be maintained in the same manner as in conventional open headphones.
[0021]
According to the open-type headphone 10 of the present embodiment, the abutting member 20 abuts against the temporal region 14A while avoiding the temple C and the muscles behind the ear 15 to increase discomfort and fatigue when pressed. As compared with the prior art, a good wearing feeling can be obtained over a long period of time, and it can be used comfortably.
[0022]
Further, in this open type headphone 10, since the contact member 20 is provided on the baffle surface 13 side of the headphone unit 12, the contact member is provided on the headband through an appropriate connection member. Thus, the number of components can be reduced, and the baffle surface 13 can be disposed at a desired position that is reasonably close to the user's ear 15.
[0023]
Furthermore, this open type headphone 10 is arranged so that the acoustic emission axis D of the electroacoustic transducer coincides with the concha cavity 15A when the user appropriately wears the open type headphone 10 to the head 14. Since the abutting member 20 is disposed with respect to the baffle surface 13, a design acoustic effect can be reliably obtained.
[0024]
By the way, in general, an open type headphone cannot avoid sound leakage from a free sound field due to its structure. However, in the open type headphone 10 of this embodiment, as shown in FIG. In order to set the low-frequency resonance frequency of the diaphragm 31 constituting 30 within the range of 70 Hz to 200 Hz, the diaphragm 31 is provided with a weight portion 32 as an additional weight, thereby correcting the low-frequency range. It has become.
In the embodiment of FIG. 3 (A), the weight section 32 arranges a number of appropriate metal particles 34 such as lead having a predetermined particle diameter in the vicinity of the coil bobbin 33 on the surface of the diaphragm 31, and then these metal particles 34. Is fixed to the diaphragm 31 with a rubber-based or silicon-based adhesive 35.
[0025]
As shown in FIG. 3B, the coil bobbin 33 may be provided with a weight portion 32B by using a metal heavier than usual.
[0026]
FIG. 4 shows the sound pressure-frequency characteristics of the open headphone 10 employing the weight part 32 of FIG. 3A, and FIG. 5 shows the sound pressure of the open headphone 10 employing the weight part 32B of FIG. FIG. 6 shows a frequency characteristic, and FIG. 6 shows a sound pressure-frequency characteristic of a conventional open type headphone without an additional weight as a comparative example.
According to these figures, it can be seen that the low-frequency range, which is lowered due to sound leakage from the free sound field 16, is corrected in the open type headphone 10 of the present invention.
In particular, it can be seen that the open headphone 10 employing the weight part 32 of FIG. 3A effectively corrects the bass range compared to the case where the weight part 32B is employed.
[0027]
According to the open-type headphone 10 of this embodiment, since a very simple structure in which the weight portion 32 is provided on the diaphragm 31 in order to correct the low frequency range is employed, The weight does not increase and the manufacturing process can be simplified.
In addition, the open type headphone 10 employing the weight portion 32 has an effect that the resonance peak value Q is kept low by the vibration damping effect of the adhesive 35 and the sound quality does not change unnaturally. Further, by appropriately selecting the material, particle size, number of the metal particles 34, the amount of the adhesive 35, the material, and the like, there is an effect that the low sound range can be easily and freely corrected.
[0028]
In the present embodiment described before mentioned, but the structure providing the parts in the vibration plate has been employed in order to correct the low frequency range, as a reference example, bass for music appreciation by the amplifier battery powered 7 the corrected open headphones sound pressure - shows frequency characteristics, sound pressure of the open type headphone corrected bass for cinema sound by the amplifier of the battery drive 8 - shows the frequency characteristic.
[0029]
Other materials such as the headband, electroacoustic transducer, headphone unit, baffle surface, free sound field, contact member, open headphone, weight part, diaphragm, adhesive, metal particles, etc. The shape, size, form, number, location, etc. are arbitrary as long as the present invention can be achieved, and are not limited.
[0030]
【The invention's effect】
As described above, according to the first aspect of the present invention, a good wearing feeling can be obtained for a long time in the open type headphones. Further, it is possible minority of the configuration components can be placed in the desired position reasonably close to the user's ear the baffle surface.
[0031]
On the other hand, according to the invention described in claim 2 , in the open type headphone, the bass range can be corrected without significantly increasing the weight and without causing unnatural feeling , and the metal particles and the adhesive particles can be corrected. By appropriately selecting the diameter, quantity, material, etc., the bass range can be corrected easily and freely.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing an embodiment of the present invention.
FIG. 2 is a schematic diagram showing the action of a contact member.
FIG. 3 is a schematic view showing a weight part and its modification.
FIG. 4 is a graph showing sound pressure-frequency characteristics of open headphones according to an embodiment of the present invention.
FIG. 5 is a graph showing sound pressure-frequency characteristics of open headphones according to another embodiment of the present invention.
FIG. 6 is a graph showing sound pressure-frequency characteristics of an open type headphone as a comparative example.
FIG. 7 is a graph showing sound pressure-frequency characteristics of an open type headphone that uses a battery-powered amplifier as a reference example .
FIG. 8 is a graph showing sound pressure-frequency characteristics of an open type headphone that uses a battery-powered amplifier as a reference example .
FIG. 9 is an overall perspective view showing a conventional open-type headphone.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Open type headphone 11 Headband 12 Headphone unit 13 Baffle surface 14 Head 14A Side head 14B Head 15 Ear 15A Ear concha 16 Free sound field 20 Contact member 30 Electroacoustic transducer 31 Diaphragm 32 Weight 34 Metal grain 35 Adhesive

Claims (2)

In order to form a free sound field between a headband and a headphone unit supported by the headband and incorporating an electroacoustic transducer, and between a baffle surface of the headphone unit and a user's ear in open headphones capable of abutting contact member is provided on the side of the head of said user,
It said abutment member, enclose the top portion side of the ear, and is formed on the baffle surface of the headphone unit as a substantially C-shaped to be engaged with the ear engaged the abutment member to the ear in sealed state, the one end of the contact member is disposed on the top portion side of the temple of the user, the line end of the abutment member connecting said top portion and cavum conchae It is arranged so as to be perpendicular to the head and on the parietal side with respect to a line passing through the concha cavity, and to be configured such that the acoustic emission axis of the electroacoustic transducer coincides with the concha cavity open-type headphones and said that you are. A weight part for setting the low-frequency resonance frequency within a range of 70 Hz to 200 Hz is additionally provided on the diaphragm of the electroacoustic transducer, and the weight part is fixed to the diaphragm with an adhesive. The open type headphone according to claim 1, comprising metal particles .

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