JP5945866B2 - Wind noise prevention device - Google Patents

Description

  The present invention relates to an apparatus for preventing wind noise that prevents communication through conversation or the like when a person acts or acts outdoors on a windy day.

  In particular, if a visually impaired person such as a blind person tries to act outdoors on a windy day, the surrounding sound and conversation cannot be heard due to the wind noise, which is very dangerous. Also, when evacuating on a typhoon day or the like, a healthy person guides and guides, but it is said that the fear of visually impaired people is still serious. The present invention relates to an apparatus for preventing wind noise, which is capable of identifying ambient environmental sounds and having conversations outdoors even on a windy day and enabling safe action.

  The situation where communication is impossible due to wind noise and communication may be difficult is assumed even in cases other than the above-mentioned visually impaired persons. For example, in a construction site of a steel tower or a high-rise building, there are cases where the wind is stronger than the ground and the conversation is difficult. The same situation can also occur on the coast or on the mountain quay. Furthermore, even in sports relations, conversations may be difficult for high-speed moving bodies such as offshore or open cars. It is assumed that there are others, but even in such a case, it is considered that conversation or the like becomes possible by wearing the wind noise prevention device according to the present invention.

[Mechanism of wind noise]
There are two types of wind noise: high-frequency sound called Hugh Hugh and low-frequency sound called Gosogoso Gogogowa. The high-frequency sound called Hugh Hugh is a wind that hits a tall building or grove and generates a vortex, and the vibration is heard as sound from the air. The low-frequency sound of scrambled sound is caused by vibrations generated in and around the ears, and will be described in detail below. The wind noise aimed at reduction by the present invention is low frequency sound.

  There are three types of low-frequency wind noise generation mechanisms. The first is airflow approach sound. When the airflow passes through the ear canal and reaches the eardrum, the vortex contained in the airflow hits the eardrum, and this vortex vibration vibrates the eardrum and can be heard as sound. That is, it is not contained as a sound component, but vortex vibration directly vibrates the eardrum.

  The second is bone conduction sound. When the wind hits the head, the vibration vibrates the ossicles of the inner ear via the skull, which is transmitted to the cochlear duct via the oval window (also called the vestibular window or elliptical window), A signal is transmitted from the auditory nerve as sound. However, the vibrations of all parts of the skull are not bone conduction sounds, but the bones near the ears seem to have a significant influence.

  The third is a secondary sound. When the wind hits the ear shell, cheekbones, nose or chin, the flow separation occurs and a vortex is generated. This vortex vibration is transmitted as sound to the eardrum via the ear canal. Therefore, even if the approach of the airflow to the ear canal is stopped, this sound is highly likely to be transmitted to the eardrum as a sound wave.

  Unlike the environmental sound and the conversation, the low-frequency sound is a sound generated when the wind enters or hits the head, and can be said to be a sound generated at the head. The wind noise of the high frequency sound described in paragraph [0004] may be considered as a sound generated in the air, and is in the same category as the environmental sound.

[General wind noise prevention device]
As an apparatus used for reducing such low-frequency wind noise, there is a wind screen used for an acoustic microphone. There are two types of windscreens used in acoustic microphones. One is to cover the microphone with a low-density sponge rubber. There is an example that is used to prevent the wind coming from the mouth from making strange sounds when singing. The other is to cover the microphone with a hair like fur or wool. There is an example used when recording outdoors with a slightly larger microphone.

  On the other hand, there is still no wind noise prevention device for human use, such as a wind screen used in an acoustic microphone. However, although it is not an aggressive wind noise prevention device, it has been experienced that wind noise is reduced even when wearing a cold hat with a normal ear cover or wearing an ear cap used in a snowy country. If you are a person, you know.

  However, such a hat with an ear cover is effective against winds with a wind speed of about 5 to 6 m / s, but in strong winds with a wind speed exceeding 10 m / s, the wind noise is too strong and hinders conversations. However, the wind noise reduction effect was small and insufficient. Also, plastics, leather hats, and the like generate a sound that their own material is rubbed by friction with the wind, which may increase the size of the material and hinder conversation.

  For example, Patent Document 1 introduces an attachment for glasses (eyewear such as sunglasses and goggles) used when riding a bicycle at high speed. This is a small windshield hood (plastics board) set around the temple part and the vine part of the glasses, so that even when running at a speed of 20 km / h (wind speed of 6 m / s or more), the ears open. It is said that wind noise at the part is reduced. The wind noise described here corresponds to the secondary generated sound described above.

  Patent Document 2 introduces a simple ear cover worn when riding a bicycle or a scooter. This is a combination of a guide (corresponding to the vine of glasses) that fits into the ear shell and a cover sheet that closes the opening of the ear canal.

  Furthermore, Patent Document 3 introduces a helmet used when riding a motorcycle. Motorcycle helmets are completely sealed and can not hear environmental sounds, so drivers who are worried about their safety may not wear a helmet, which is very dangerous. Therefore, an opening is opened near the ear of the helmet so that environmental sounds can be heard, but the surface is covered with a ciliary body so that wind noise does not occur at the opening.

JP 2002-156613 A JP 2008-289832 A JP 2010-47886 A

However, in “eyewear” disclosed in Patent Document 1, in the case of a typhoon exceeding a wind speed of 15 m / s, it is assumed that the wind noise generated by the hood becomes strong and insufficient.
Further, in the “ear cover” disclosed in Patent Document 2, a conversation can be heard even if this cover sheet is worn, so that a sufficient gap for sound waves to enter the external auditory canal is secured. Is the same. Therefore, the effect is equivalent to or smaller than that of Document 1, and is considered to be a simple type.
Furthermore, in the “helmet wind noise prevention device” disclosed in Patent Document 3, the headphone type microphone and speaker prepared in the helmet communicate with each other, but thanks to this hairy body, The wind noise is so small that the sound of the speaker can be heard, and the vortices generated on the outline and surface of the helmet are not disappearing.
Wind noises are those in which the wind hits an obstacle and the vortex vibrations generated there enter the ear canal as sound in the air. Therefore, the vortex vibration generated in the hood or helmet becomes sound and enters the external auditory canal, and cannot be eliminated by the ciliary body. However, it is possible to eliminate the vortex that occurs in the immediate vicinity of the hair. In the case of a helmet, the vortex right next to the ear hole opening can be erased, but the vortex generated by the outline of the helmet does not disappear. Therefore, the secondary generated sound remains.

  The present invention has been made to solve the above-described inconveniences, and by covering not only the ears but also the cheeks, the generation of secondary sounds is prevented, and strong wind noises even in strong winds. It is intended to provide a wind noise prevention device that does not feel the noise.

The present invention has the following contents.
(1) In order to achieve the above object, the present invention is a wind noise prevention device that covers at least the entire region or part of the head including the ear portion in order to reduce the wind noise, and includes all or one of the ear shell and the cheekbone. The cheek ear cover part that suppresses the surrounding area including the part firmly and prevents the airflow from entering the external auditory canal and overhangs the ear shell so as to reduce the bone conduction sound and secondary generated sound near the ear shell and cheekbone. Vortex-eliminating means made of wool or fur-like hair covering the surface of the cheek ear cover portion, a belt for fixing the cheek ear cover portion and the vortex-eliminating means to the head , a band-like shape is a stationary unit, said fixing means is characterized Rukoto which have a length adjustment mechanism for preventing the entry of air flow.
(2) Further, the cheek ear cover portion is characterized by being a low density sponge rubber or a cloth having a thickness of 5 mm .
(3) the in hairs in the vortex erase unit, a main material is the length of the bristles is mohair of 1cm~2cm of yarn or pile length 2cm artificial or natural fur, the cheeks It exists to the edge of an ear | edge cover part, It is characterized by the above-mentioned.

According to the present invention, in order to reduce wind noise, a wind noise prevention device that covers at least the entire region or part of the head including the ears, and the peripheral region including all or part of the ear shells and cheekbones is firmly secured. A cheek ear cover portion for preventing the ear shell, the bone conduction sound in the vicinity of the cheekbone, and the secondary generated sound from being reduced so that the covering airflow does not enter the ear canal and the ear shell is not restrained. Vortex-eliminating means consisting of wool or fur-like hair covering the surface of the hair , a belt for fixing the cheek ear cover part and the vortex-eliminating means to the head, and band-like fixing means , said fixing means, as they may have a length adjustment mechanism for preventing the ingress of air flow, stopped from entering the air flow of the ear canal to reduce the main bone-conduction sound, also reduces the major secondary generated sound By doing so, even in strong winds exceeding 10m / s, Sound can be prevented and environmental sounds and conversations can be heard.
Moreover, since the cheek ear cover portion is a low-density sponge rubber or cloth having a thickness of 5 mm , wind noise can be effectively prevented.
Further, in hairs in the vortex off means is the main material is the length of the bristles is mohair of 1cm~2cm of yarn or pile length 2cm artificial or natural fur, the cheeks ears Since it exists to the edge of a cover part, a wind noise can be prevented effectively.

FIG. 1 is a front view of a wind noise prevention apparatus showing an embodiment of the present invention. FIG. 2 is a side view showing the wind noise prevention device. FIG. 3 is a rear view of the wind noise prevention device. FIG. 4 is a front view of a wind noise prevention device showing another embodiment of the present invention. FIG. 5 is a side view of the wind noise prevention device. FIG. 6 is a rear view of the wind noise prevention device. FIG. 7 is a longitudinal sectional view of the wind noise prevention device.

  The wind noise prevention apparatus of the present invention includes a cheek ear cover portion that covers a peripheral region including the ear portion and the cheek portion and prevents airflow from entering the external auditory canal, and a vortex-eliminating means that includes a hair-like body covering the surface of the cheek ear cover portion. And fixing means for fixing the cheek ear cover part and the swirling means to the head, preventing the entry of airflow into the ear canal, reducing the main bone conduction sound, even in strong winds, Identification of environmental sounds and conversation were made possible.

  Hereinafter, the present invention will be described in detail with reference to the drawings illustrating an embodiment. FIG. 1 is a front view of a wind noise prevention apparatus showing an embodiment of the present invention, FIG. 2 is a side view of the wind noise prevention apparatus of the present invention, and FIG. 3 is a rear view thereof. Here, the wind noise prevention device 10 covers at least the whole or part of the head including the ears in order to reduce the wind noise, covers the peripheral area including the ears and the cheeks, and allows the airflow to flow in the ear canal. The cheek ear cover portion 11 for preventing the cheek ear cover portion from entering into the head, the vortex-eliminating means 12 composed of a hair covering the surface of the cheek ear cover portion, and the cheek ear cover portion 11 and the vortex-eliminating means 12 are fixed to the head. It is comprised from the fixing means 13 for doing.

  The cheek ear cover portion 11 has a vertically long shallow ridge shape, and has a structure covering the peripheral area including all or part of the ear shell and cheekbone. In other words, the cheek ear cover body is made of low-density sponge rubber or the like, and a sheet with a thickness of about 5 mm is slightly curved and protrudes outward, so that it fits the ear with little burden. . With such a configuration, airflow can be prevented from entering the ear canal and can be almost eliminated. Further, in order not to overtighten the ear, the periphery of the ear is firmly fixed without a gap, but it is also necessary to provide a margin by projecting the ear shell so as not to be suppressed too firmly.

  The fabric of the cheek ear cover portion 11 needs to be a low density sponge rubber (open cell sponge rubber) having a thickness of about 5 mm or a normal fabric which is not so thick. If high-density sponge rubber (closed-cell sponge rubber) is used for the fabric of the cheek ear cover part 11, the strength of the conversational sound is reduced by about 3 to 6 dB. Even with a low density sponge rubber, if the thickness is increased to about 15 mm, the sound becomes muffled. That is, it attenuates. Since a hair-like body is also affixed to the cheek ear cover, the thickness of the fabric is preferably about 5 mm. If the fabric is not thick, sound attenuation is small.

  In the bone conduction sound, the vibration of the wind hitting the head is transmitted to the ossicles through the skull, but the vibration of the wind hitting the forehead is hardly felt as a bone conduction sound. Rather, vibration near the ear shell is often felt as a bone conduction sound. Therefore, the bone conduction sound can be significantly reduced by making the cheek ear cover portion 11 slightly larger.

  The secondary sound is caused by a vortex generated by the wind hitting the head. This vortex can be erased by the wool or fur hair used in the windscreen of the acoustic microphone. There are various vortex generation sites such as the forehead, nose, chin, cheekbones, and ear shells. We exposed only each of these parts and covered all the other heads with a cover with a ciliary body, and conducted an experimental investigation on which part the secondary generated sound was louder.

  As a result, the place where the secondary sound was the largest was the ear shell. Next was the cheekbones. Accordingly, when the front portion of the cheek ear cover portion is protruded to cover the cheekbone, and the whirl-ear cover portion 11 is covered with a ciliary body composed of long woolen hairs, the vortex-eliminating means 12 is installed. The sound almost disappeared and I could not hear it. If you cover only your ears, you will not hear the effect of the cover because the wind noise will be loud due to the strong wind of 10m / s. By covering the cheekbones, the wind noise was almost eliminated. Therefore, the present invention is the cheek ear cover portion 11.

  Actually, there were some secondary noises in the nose and chin. However, this sound was so small that we did not notice it. However, blind people with advanced hearing recognized this sound. However, it was to say that it was not something that would interfere with the conversation. On the other hand, the secondary noise on the forehead was not recognized by not only the healthy but also the blind. Therefore, the coverage of the cover is sufficient for the cheeks and ears.

  The vortex-eliminating means 12 of the ciliary body has a role of fur used in an acoustic microphone. When the main material is a yarn, a mohair yarn having a length of 1 to 2 cm is suitable. Further, in the case of artificial or natural fur (animal hair), it is appropriate that the length of the hair foot is about 2 cm to 3 cm. If it is shorter than this, the large vortex cannot be erased. If the length is too long, the hair will be chopped down by the strong wind and will not serve as a whirlpool. The fur (animal hair) is stiffer and has a lower waist than the mohair yarn, and can be slightly longer.

  The ciliary body that is the vortex eliminating means 12 uses a fur cloth having a thick base and an appropriate length of the hair and attaches it to the outside of the cheek ear cover. When the fur fabric base is thick, the conversational sound may be lowered. In this case, the thickness of the sponge rubber of the cheek ear cover portion 11 is adjusted. The material of the hair-like body is preferably a yarn. For those used in snowy countries, a wax treatment that makes it difficult for snow to adhere on a snowstorm day is effective.

  As described above, since the ciliary body is a means for eliminating the vortex, it must be distributed over the entire surface of the cheek ear cover portion 11, and in particular, the side of the cheek ear cover portion 11 where the vortex is most likely to occur. It must be present at the edges without any gaps.

  The fixing means 13 is for firmly fixing the cheek ear cover part 11 to the head. In the first embodiment, the fixing means 13 has a hair band shape and has a telescopic part 13a at the back of the head. The length can be adjusted by the stretchable portion 13a. The stretchable portion 13a may be cut and provided with a hook-and-loop fastener or the like and overlapped. Other embodiments may be in the form of a belt, band, hat, or cover. Thus, it is necessary to fix firmly. This is because, in the case of loose mounting, wind noise is generated due to the air current entering or wind hitting the ear shell.

  As the form of the fixing means 13, a belt, a band, a hat, a cover, or the like can be considered. In order to fix firmly, it is desirable that there is a stretchable part like a rubber belt, but it also has a length adjustment mechanism such as a string, hook-and-loop fastener, various adjusters, etc., to ensure the fixing strength There is also a method. By doing so, it is not necessary to arrange many sizes such as belts and hats.

  The portion of the belt with the buccal ear cover 11 is related to the base material of the buccal ear cover 11 and the like, and the elasticity is not so strong. In FIG. 3, the belt has a structure having a stretchable portion 13a at the back of the head. Instead of the stretchable portion 13a, a method of fixing with a hook-and-loop fastener or a string may be considered.

  4 to 7 show another embodiment of the present invention. Here, it is a cheek ear cover with a cap-type hair. This is a structure in which the ear-filled portion of the hat 20 is a buccal ear cover portion 21 with a hair-like body.

  There is a band 22 for size adjustment behind the hat 20, which is structured to be fastened with a hook-and-loop fastener, and has a fixing belt 23 that is tightened at the chin portion in order to firmly fix the cheek ear cover portion 21. The structure. The fixing belt 23 may be an adjuster, a hook-and-loop fastener or a string.

  As shown in FIG. 7, the buccal ear cover portion 21 has a structure that covers a peripheral area including all or part of the ear shell and the cheekbone. The members are the same as in the first embodiment.

  As the hat 20, a base cap for a wig can also be used. The cheek ear cover portion 11 is formed integrally with the cap, and the hair covering the cheek ear cover portion can appropriately adjust the length of the hair foot while considering the design. If there is such a thing, it is less necessary to put a hat on the wig, and an effect of preventing wind noise can be obtained.

  In the above-described embodiments, the fixing means has been described with respect to a hair band, a hat, and a base cap for a wig. However, the present invention is not limited to this, and other head accessories may be used.

DESCRIPTION OF SYMBOLS 10 Wind noise prevention device 11 Buccal ear cover part 12 Whirling means 13 Fixing means 20 Hat 21 Buccal ear cover part 22 Size adjustment band 23 Fixing belt

Claims (3)

A wind noise prevention device that covers at least the whole or part of the head including the ears to reduce wind noise, and firmly covers the peripheral area including all or part of the ear shell and cheekbones to cover the airflow. A cheek ear cover portion that does not enter the ear canal and does not restrain the ear shell and reduces the ear shell, the bone conduction sound near the cheekbone and the secondary generated sound, and a yarn covering the surface of the cheek ear cover portion , It comprises a vortex-eliminating means comprising a fur-like hair, a belt for fixing the cheek ear cover part and the vortex-eliminating means to the head, and a band-like fixing means, wind noise preventing device according to claim Rukoto which have a length adjustment mechanism for preventing the entry of air flow. The wind noise prevention device according to claim 1, wherein the cheek ear cover portion is a low density sponge rubber or a cloth having a thickness of 5 mm . Wherein in hairs eddy off means, the main material is fur length 2cm artificial or natural wool or haired mohair length of haired 1 cm to 2 cm, the cheeks ear cover The wind noise prevention device according to claim 1, wherein the wind noise prevention device exists up to the edge.

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