JPH01144892A - Headphone - Google Patents

Abstract

PURPOSE:To attain the listening of a reproduced sound very close to natural sound by forming a rear side of a speaker unit of a housing containing the speaker unit by a single natural tree board. CONSTITUTION:A housing main body 9 constituting a housing 2 of a headphone is made of a single board of a zelkova being a natural tree whose Young's modulus is high and internal loss is large. A front board 10 constituting the housing 2 is similarly made of a single board of a zelkova. In the sound pressure frequency characteristic of the headphone whose housing 2 is made of the zelkova, the emphasis at the medium frequency band is recognized. The vibration characteristic as above is coincident with the audible sense characteristic by a human being in case of listening to a natural sound. Thus, the tone and the acoustic characteristic of the reproduced sound are very close to those of natural sound and the reproduced sound is listened tone in an excellent way.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to headphones in which a speaker unit is housed in a housing.

B6 Prior Art Conventionally, headphones that support a speaker unit at each end of an elastic headband and can be worn on the head via the headband have a housing attached to each end of the headband. are attached, and the speaker unit is housed and supported within these housings.

The housing is generally formed by molding synthetic resin such as ABS resin or acrylic resin.

C0 Problems to be Solved by the Invention The housing of headphones houses and supports the speaker unit, so when the speaker unit is driven, the vibrations of the speaker unit are transmitted to the housing, causing the housing to vibrate. As a result, in addition to the reproduced sound that is emitted from the speaker unit and directly enters the ear, the vibration of the auricle or the housing that is in contact with the auricle becomes a sound wave that is transmitted to the ear, and the reproduced sound that is heard is It affects the timbre and acoustic characteristics.

By the way, as mentioned above, the housing of conventional headphones is formed from a synthetic resin molded body, so we tried to solve the molding problems when molding the housing to house the speaker unit. Attempts to guarantee mechanical strength are limited by the synthetic resin materials used. In other words, the Young's modulus required for the housing that houses the speaker unit is high, and materials with large internal losses cannot be selected.As a result, the housing made of synthetic resin vibrates due to the vibrations transmitted when the speaker unit is driven. Let's make two k
This impedes the timbre of the reproduced sound that is heard and has an adverse effect on the acoustic characteristics, resulting in the problem that the reproduced sound cannot be heard with good audibility.

Therefore, as a result of extensive research, the inventors of the present invention have developed a housing that does not interfere with the timbre of the reproduced sound that can be heard, has good acoustic characteristics, and makes it possible to hear reproduced sound that is audibly good. He devised a pair of headphones with a built-in headset.

Means for Solving the D0 Problem The present invention is a headphone in which a speaker unit is housed in a housing, in which at least the rear side of the speaker unit of the housing is formed of a natural wood veneer.

E6 Effect In the headphone according to the present invention, the housing housing the speaker unit has at least the back side of the speaker unit formed of a single plate of natural wood, so the housing has a high Young's modulus and a large internal loss. Ru.

Therefore, transmission of unnecessary vibrations transmitted from the speaker unit is suppressed, resonance within the housing can be utilized, and the tone is clear and the mid-range frequency band is enhanced.

F. Examples Specific examples of the present invention will be described below with reference to the drawings.

As shown in FIG. 2, the headphone according to the present invention has a housing 2.2 attached to each end of the headband 1, and a speaker unit 3 disposed within each housing 2.2.
．． It is constructed by storing and arranging 3. A head support 1a is provided on the curved inner side of the headband 1 to provide a comfortable wearing feeling when worn on the head.

An ear pad 4 made of an elastic material such as urethane foam is attached to the outer periphery of the front side of the housing 2.2 housing the speaker unit 3.3.

Further, housing support members 6, 6 are interposed between the headband 1 and the housing 2.2, and each housing support member 6, 6 has a built-in position adjustment mechanism 5 that can variably adjust the support position of the housing 2.2 with respect to the headband 1. Each speaker unit 3.3 is configured so that it can be properly pressed onto each person's auricle when the speaker unit 3.3 is attached to the person's body. Furthermore, one housing 2
A connection cord 8 with a connection plug 7 attached to the tip is pulled out from the side.

As shown in FIG. 1, the housing 2 that houses the headphone speaker unit 3 configured as described above has a large-diameter opening on the front side and a tapered shape from the front side toward the proximal end. A housing body 9 is formed into a bowl shape, and an opening 10a is formed to close the opening on the front side of the housing body 9 and allow the sound emitting surface 3a of the speaker unit 3 to face outward. It is composed of a front plate 10. This front plate 10 is joined to the front side of the housing body 9 via adhesive or joining pins.

The speaker unit 3 includes a magnetic circuit section 3 on the base end side.
b is located inside the housing main body 9, and the sound emitting surface 3a facing the front side diaphragm is located at the opening 10a of the front plate 10.
The flange portion 3C projected from the outer periphery of the sound emitting surface 3a is fitted into the opening 3a.
The housing 2 is housed within the housing 2 by being fixed to the periphery of the housing 2 with adhesive or screws. A support piece 11 is provided inside the housing body 9 to support a portion of the speaker unit 3 fixed to the front plate 10.
The support strength of the front plate 10 supporting the front plate 10 is increased. Further, the external connection cord 12 pulled out from the speaker unit 3 is inserted into a cylindrical support rod 13 attached to the central part of the base end side of the housing body 9 that supports the housing 2 on the housing support member 6, and is inserted into the support rod 13 of the housing 2. being pulled outside.

By the way, the housing 2 of the headphone according to the present invention
The housing body 9 that makes up the housing is made from a veneer of natural wood seed material, which has a higher Young's modulus and a larger internal loss than the synthetic resins such as ABS resin and acrylic resin that make up the housing of conventional henodophones. It is formed. The housing body 9 is formed by cutting a block of seed material into the shape described above. Further, the front plate 10 constituting the housing 2 is also formed of a veneer of natural wood seed material.

The sound pressure frequency characteristics of the headphones whose housing 2 is formed of this seed material exhibit characteristics as shown by A in FIG.
While conventional headphones whose housings are made of molded ABS resin exhibit the characteristics shown by B in Figure 3,
Particularly, enhancement is observed in the middle frequency band around 1,500H2 to 5,500H2. The vibration characteristics of the headphones according to the present invention match the auditory characteristics when a person listens to natural sounds, and the timbre and acoustic characteristics of the reproduced sound are extremely close to those of natural sounds. It becomes possible to listen to good reproduced sound.

In addition, the sound pressure frequency characteristics of the headphones in which the housing 2 is made of rosewood, which is a natural wood similar to the seed material, exhibit characteristics as shown by C in FIG. Vibration characteristics of headphones (Figure 4 Chunichi)
Enhancement in the mid-range frequency band is observed compared to .

Furthermore, the sound pressure frequency characteristics of the headphones in which the housing 2 is made of maple wood, which is a natural tree similar to the seed material, exhibit characteristics as shown in the middle of FIG.
Compared to the vibration characteristics of conventional headphones made of resin (B in Figure 5), an enhancement in the mid-range frequency band is observed.

Furthermore, as a comparative example, the sound pressure frequency characteristics of a headphone whose housing for housing the speaker unit is made of aluminum exhibits characteristics as shown by E in Figure 6, and most of the playback output is obtained in the mid-low frequency band. Therefore, the reproduced sound that is heard becomes extremely unnatural.

In addition, the sound pressure frequency characteristics of the housing formed of a molded acrylic resin exhibit the characteristics as shown in No. 6@F in the present invention, in which the housing 2 is formed of the seed material shown in A in FIG. Unlike the headphones according to the above, enhancement in the mid-range frequency band is not observed, and it is not possible to sufficiently reproduce good reproduced sound.

By the way, the above-mentioned enhancement in the mid-range frequency band is achieved and it is possible to hear reproduced sounds that are extremely close to natural sounds when the housing 2 is made of natural wood with a high Young's modulus and a large internal loss. This is based on the fact that vibration absorption when the speaker unit 3 is driven is achieved in the housing 2, vibration of the housing 2 is prevented, and resonance within the housing 2 is effectively utilized. Conceivable.

Therefore, the housing 2 may be formed so as to effectively utilize the resonance within the housing 2, and the housing body 9 covers the rear side of the speaker unit 3 from which sound is emitted from the rear side of the speaker unit 3. The same acoustic characteristics can be obtained even if the only part is made of natural wood as described above.

H1 Effects of the Invention As described above, in the present invention, at least the rear side of the housing housing the speaker unit is formed of a natural wood veneer, so the housing has a high Young's modulus and has low internal loss. This technology suppresses the transmission of unnecessary vibrations transmitted from the speaker unit, making it possible to utilize the resonance within the housing, making it extremely natural sound with a clear tone and enhanced mid-range frequency range. It is possible to configure headphones that enable listening to closely reproduced sounds.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a housing housing a speaker unit of headphones according to the present invention, and FIG. 2 is a partially cutaway front view showing the headphones. Figure 3 is a characteristic diagram comparing the sound pressure frequency characteristics of housings made of bar material and ABS resin, and Figure 4 is a comparison of the sound pressure frequency characteristics of housings made of rosewood and ABS resin. FIG. 5 is a characteristic diagram that compares and shows the sound pressure frequency characteristics of housings made of maple wood and ABS resin. FIG. 6 is a characteristic diagram showing a comparison of the sound pressure frequency characteristics of housings made of bar material, aluminum, and acrylic resin. 2...Housing, 3...Speaker unit 9...
・Housing body, 10...front plate patent applicant
Sony Corporation Representative Patent Attorney Akira Koike (and 2 others) Figure 1 Figure 2 (dB) Figure 3 (dB) Figure 4 Koyashimu - Yasushi Δn →

Claims (1)

[Claims] A headphone in which a speaker unit is housed in a housing, wherein the housing is formed of at least a back side of the speaker unit with a veneer of natural wood.