JP3234196B2 - Facepiece mounting speaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voice transmitter which is suitable for being used by attaching to a mask such as a dust mask or a gas mask.

[0002]

2. Description of the Related Art It is well known to wear a dust mask or a gas mask at a site where dust and gas are generated. These masks have a face body that is brought into close contact with the face of the wearer and covers at least the mouth and nostrils, and a wearing means such as a headband for bringing this face body into close contact with the face. Some have a speaker to facilitate communication. The voice transmitter has a voice transmitting thin film such as a plastic film stretched over a frame. The voice of the wearer causes the thin film to vibrate, and the vibration causes air outside the mask to vibrate so that the voice is transmitted.

[0003]

In such a thin film, a peripheral portion of the thin film is fixed to a frame in a tensioned state so that voice can be clearly transmitted. The frame is composed of, for example, a pair of front and rear members, and when these two members are caulked and integrated, the thin film sandwiched between the two members is elongated and tensioned. However, in such a method, there is a limit to the amount of elongation of the thin film. In addition, there is a problem that it is difficult to make the tension state of the thin film uniform among the voice transmitters.

[0004] Therefore, an object of the present invention is to facilitate the tension of a thin film in a voice transmitter.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, an object of the present invention is a voice transmitter attached to a face covering at least a mouth and a nostril of a wearer.

In this object, the present invention is characterized in that the voice transmitter has a frame and a thin film having a peripheral portion fixed to the frame, and the thin film is provided inside the frame. A pressing portion for pressing the thin film from the front surface to the rear surface or from the rear surface to the front surface so as to keep the thin film in a tensioned state.

In one preferred embodiment of the present invention, the frame has a perforated plate for covering and protecting the thin film inside the frame, and the pressing portion has a protruding portion from the perforated plate toward the thin film. It is.

In another preferred embodiment of the present invention, the pressing portion is formed so as to be adjustable in length until it comes into contact with the thin film so that the tension of the thin film can be adjusted. ing.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a speaker according to the present invention.

FIG. 1 is a perspective view of a dust mask 1 in which a voice transmitter 5 is used. The mask 1 has a face 2 covering the mouth and nostrils of the wearer, a headband 3 wrapped around the wearer's head, and a band supporting member 4 for attaching the band 3 to the face 2.

The face body 2 is made of a soft and elastic material such as silicone rubber. In addition to the speaker 5 attached to the center, a pair of right and left filter units 6 and 6
Check valve 12 (FIG. 2)
) And an exhaust check valve 8 (see FIG. 2) covered with a cap 7 so as to be permeable.

FIG. 2 is a view taken along the line II-II in FIG. The facepiece 2 has a voice transmitter 5 in front of the wearer (left side in the figure), and a relatively thin face contact portion 1 in the rear side (right side in the figure).
3 A check valve 12 for intake is mounted on a side surface of the face body 2, and a check valve 8 for exhaust is mounted on a lower portion of the face body 2. The voice transmitter 5 has a disk shape, and a frame portion 11 forming a peripheral portion thereof is press-fitted into a groove 17 formed at an edge of a central through hole 16 of the face body 2.

FIG. 3 is a partially cutaway perspective view of the voice transmitter 5. As is clear from FIGS. 2 and 3, the voice transmitter 5 has a front frame member 21, a rear frame member 22, and a thin voice film 23 located between the two members 21 and 22.
The front frame member 21 includes a frame portion 24 extending along a peripheral edge thereof, and a voice transmission film covering portion 26 positioned inside the frame portion 24 and forming a curved surface protruding outward from the voice device 5.
And a protruding portion 27 extending from the inner surface of the covering portion 26 toward the voice transmission film 23. The rear frame member 22 has a frame portion 28 extending along the peripheral edge, and a voice transmission film covering portion 29 that is located inside the frame portion 28 and that defines a curved surface that is convex toward the outside of the voice device 5. The outer diameter of the frame portion 28 is made slightly smaller than that of the front frame member 21. The front and rear frame members 21 and 22 sandwich the peripheral portion of the voice transmission membrane 23 between the frame portions 24 and 28, and the peripheral portion 30 of the front frame portion 24 having a large diameter is folded over the rear frame portion 28. United by
A frame 11 as the voice transmitter 5 is formed. The protruding portion 27 of the front frame member 21 presses the voice transmission film 23 from the front to make the film 23 taut. Voice membrane coating 2
Numerals 6 and 29 are for preventing an object from touching the voice transmission film 23, and a large number of openings 31 and 32 having an appropriate shape are formed.

When the voice transmitting film 23 is pressed by the projecting portion 27 of the voice transmitting device 5, the voice transmitting film 23 is tensioned only by sandwiching between the front and rear frame portions 24 and 28 as in the prior art. As a result, the membrane 23 is securely and highly tense, and the voice transmission function is improved.

FIG. 4 is a part of the same drawing as FIG. 2 showing an embodiment of the present invention. In the illustrated voice transmitter 5, the front frame member 21 has an annular protrusion 36 instead of the protrusion 27 in FIG. 2. With such a protrusion 36, the pressing force does not concentrate on one point of the voice transmission film 23 unlike the protrusion 27.

FIG. 5 is a view similar to FIG. 4 showing an example of the embodiment. In this voice transmitter 5, a bolt 38 inserted into a screw hole 37 formed in the front frame member 21 is used as the protruding portion 27. The bolt 38 extends into the voice transmission device 5 and presses the voice transmission film 23 at a tip portion which contacts the voice transmission film 23. With such a voice transmitter 5, the degree of tension of the voice transmission film 23 can be adjusted by the length of the extension of the bolt 38. It is preferable that the position of the bolt 38 after the length adjustment is fixed by a nut or an adhesive. If the length of the protruding portion 27 is adjustable like the bolt 38, it is not necessary to forcibly tension the voice transmission film 23 when manufacturing the voice transmitter 5 as in the related art. As a result, it is possible to easily solve the problem that the voice transmission film 23 is wrinkled and the degree of tension of the voice transmission film 23 varies between the voice transmission devices 1.

In the voice transmitting device 5 according to the present invention, the voice transmitting film 23
For example, non-extensible metal foils and plastic films, and extensible rubber sheets and plastic films can be used. In the front and rear frame members 21 and 22, the voice transmission film covering portions 26 and 29 can be omitted. Coating part 26,2
9 is omitted, one of the frame portions 24 and 28 on the front and rear surfaces is provided with a protrusion 27 or 36 for pressing the voice transmission film 23,
A mechanism for supporting the bolt 38 is provided. The front and rear frame members 21 and 22 can be integrated by mutually joining the frame portions 24 and 28 with a bolt or an adhesive or by welding using ultrasonic waves if they are made of a thermoplastic plastic. The voice transmission film 23 can be pressed from the rear to the front, contrary to the illustrated example.

[0018]

In the voice transmitting device according to the present invention, the voice transmitting film is securely and highly tensioned by the protruding portion provided on the frame portion, so that the voice transmitting function is improved as compared with the prior art.

[Brief description of the drawings]

FIG. 1 is a perspective view of a dust mask.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a partially broken perspective view of a voice device.

FIG. 4 is a part of a drawing similar to FIG. 2 showing an exemplary embodiment;

FIG. 5 is a view similar to FIG. 4, showing another embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 mask dihedron 5 voice transmitter 11 frame 23 thin film (voice transmission film) 26 perforated plate (covering portion) 27 pressing portion (protruding portion) 29 porous plate (covering portion) 36 pressing portion (protruding portion) 38 pressing portion (bolt) )

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A62B 18/08

Claims (3)

(57) [Claims] 1. A loudspeaker attached to a face body covering at least a mouth and a nostril of a wearer, wherein the loudspeaker has a frame and a voice transmission thin film having a peripheral part fixed to the frame. And a pressing portion on the inside of the frame for pressing the thin film from the front surface to the rear surface or from the rear surface to the front surface to keep the thin film in a tensioned state. The above-mentioned voice transmitter characterized by the above-mentioned. 2. The voice transmission according to claim 1, wherein the frame has a perforated plate for covering and protecting the thin film inside the frame, and the pressing portion is a protrusion from the perforated plate toward the thin film. vessel. 3. The voice transmission according to claim 1, wherein the pressing portion is formed so as to be adjustable in length until it comes into contact with the thin film so that the tension state of the thin film can be adjusted. vessel.