阅读说明：本技术 声音接收装置 (Sound receiving device ) 是由 松下勉 原野博之 粟村竜二 中西贤介 于 2021-04-29 设计创作，主要内容包括：本发明的声音接收装置位于第一空间中,接收在利用规定的板与第一空间隔开的第二空间中产生的声音,其中,包含：金属板；压电元件,其固定于金属板的上表面；壳体,其为上表面及下表面开口的筒状,且其上端面粘接在金属板的下表面,下端面粘接于板；振动拾取用端子,其收容于壳体,且包含粘接于金属板的下表面的脚部、从脚部向下侧方向延伸的轴部和形成于轴部的下侧方向的前端且在将壳体粘接于板时与板接触的前端部。(A sound receiving device according to the present invention is a sound receiving device that is located in a first space and receives sound generated in a second space separated from the first space by a predetermined plate, the sound receiving device including: a metal plate; a piezoelectric element fixed to an upper surface of the metal plate; a housing having a cylindrical shape with openings in an upper surface and a lower surface, the upper end surface of the housing being bonded to the lower surface of the metal plate, and the lower end surface of the housing being bonded to the plate; and a vibration pickup terminal which is housed in the housing and includes a leg portion adhered to the lower surface of the metal plate, a shaft portion extending downward from the leg portion, and a tip portion formed at a tip end of the shaft portion in a lower direction and coming into contact with the plate when the housing is adhered to the plate.)

1. A sound receiving device, which is located in a first space, receives sound generated in a second space separated from the first space by a prescribed plate,

the sound receiving apparatus includes:

a metal plate;

a piezoelectric element fixed to an upper surface of the metal plate;

a housing having a cylindrical shape with openings in an upper surface and a lower surface, the upper end surface of the housing being bonded to the lower surface of the metal plate, and the lower end surface of the housing being bonded to the plate;

and a vibration pickup terminal which is housed in the housing and includes a leg portion bonded to a lower surface of the metal plate, a shaft portion extending downward from the leg portion, and a tip portion formed at a tip end of the shaft portion in a lower direction and coming into contact with the plate when the housing is bonded to the plate.

2. Sound receiving apparatus according to claim 1,

the shaft portion is hollow.

3. Sound receiving apparatus according to claim 2,

the vibration pickup terminal has a pogo pin structure in which a spring is housed in a hollow of the shaft portion, an upper end of the spring is connected to the leg portion, and a lower end of the spring is connected to the tip portion.

4. Sound receiving apparatus according to claim 1,

the vibration pickup terminal is formed to have a vertical total length longer than a vertical total length of the housing by a predetermined length.

5. Sound receiving apparatus according to claim 2,

the vibration pickup terminal is formed to have a vertical total length longer than a vertical total length of the housing by a predetermined length.

6. Sound receiving apparatus according to claim 3,

the vibration pickup terminal is formed to have a vertical total length longer than a vertical total length of the housing by a predetermined length.

Technical Field

The present invention relates to a sound receiving device that is located in a first space and receives sound generated in a second space separated from the first space by a predetermined plate.

Background

As a conventional technique of a sound pickup microphone, there is, for example, patent document 1 (patent document 1: japanese patent No. 6622638).

The contact microphone module of patent document 1 is a contact microphone module that converts mechanical vibration into an electrical signal by pressing a piezoelectric element with a vibrating element, and includes a piezoelectric vibrating plate supported in a module case so as to be capable of vibrating and a vibrator housed in the module case and disposed above the piezoelectric vibrating plate, the vibrator having a spherical surface portion abutting against a center portion of the piezoelectric vibrating plate, and an elastic member being provided in the module case at least between the piezoelectric vibrating plate and the spherical surface portion of the vibrator.

For example, a car needs a sound hole to receive sound generated outside the car, but the sound hole is not provided in the car for many reasons. In addition, in the case where a reception room and a waiting room in a hospital or the like are partitioned by glass or the like, sound holes are required in the reception room to receive sounds generated in the waiting room, but in many cases, the sound holes cannot be provided from a hygienic viewpoint.

Disclosure of Invention

The object of the invention is therefore: provided is a sound receiving device which is located in a first space and can receive sound generated in a second space that is separated from the first space by a predetermined plate.

A sound receiving device according to the present invention is a sound receiving device that is located in a first space and receives sound generated in a second space separated from the first space by a predetermined plate, the sound receiving device including: a metal plate; a piezoelectric element fixed to an upper surface of the metal plate; a housing having a cylindrical shape with openings in an upper surface and a lower surface, the upper end surface of the housing being bonded to the lower surface of the metal plate, and the lower end surface of the housing being bonded to the plate; and a vibration pickup terminal which is housed in the housing and includes a leg portion adhered to the lower surface of the metal plate, a shaft portion extending downward from the leg portion, and a tip portion formed at a tip end of the shaft portion in a lower direction and coming into contact with the plate when the housing is adhered to the plate.

The sound receiving device of the present invention is located in a first space and can receive sound generated in a second space separated from the first space by a predetermined plate.

Drawings

Fig. 1 is a sectional view of a sound receiving apparatus of embodiment 1.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail. Note that the same reference numerals are given to the components having the same functions, and redundant description is omitted.

[ example 1 ]

Hereinafter, the structure of the sound receiving apparatus 1 according to embodiment 1 will be described with reference to fig. 1. As shown in the drawing, the sound receiver 1 of the present embodiment is located in a first space (for example, inside a vehicle or a room), and receives sound generated in a second space (for example, outside the vehicle or the room) separated from the first space by a predetermined plate 9 (for example, window glass of a vehicle, window glass of a house, glass plate partitioning a reception room and a waiting room, acrylic resin plate, or the like), and includes: a metal plate 11 (functioning as a one-side electrode); a piezoelectric element 12 fixed to the upper surface of the metal plate 11 via an adhesive layer 17; a case 13 having a cylindrical shape (for example, a cylindrical shape, a square cylindrical shape, or a cylindrical shape having an arbitrary polygonal cross section) with an upper surface and a lower surface opened, the upper end surface of which is bonded to the lower surface of the metal plate 11 via an adhesive layer 14, and the lower end surface of which is bonded to the plate 9 via an adhesive layer 15; the vibration pickup terminal 16 is housed in the housing 13, and includes a leg portion 161 (for example, may have a flat disk shape) bonded to the lower surface of the metal plate 11 via the adhesive layer 18, a shaft portion 162 extending downward from the leg portion 161, and a tip portion 164 (for example, may have a spherical shape or an ellipsoidal shape flattened in the vertical direction) formed at the tip in the lower direction of the shaft portion 162 and contacting the plate 9 when the housing 13 is bonded to the plate 9.

The adhesive layers 14, 17, and 18 are preferably formed of a hard adhesive so that vibration loss is less likely to occur. Note that the adhesive layer 15 does not aim to transmit vibration, and therefore, it is not necessary to use a hard adhesive, and it is sufficient if the adhesive has a high adhesive force.

As shown in fig. 1, by passing a straight line (a one-dot chain line in the figure) extending in the longitudinal direction from the center (point a in the figure) of the vibration pickup terminal 16 near the center (point B in the figure) of the piezoelectric element 12, the vibration propagating through the vibration pickup terminal 16 can be efficiently transmitted to the piezoelectric element 12.

As shown in fig. 1, if the hole 163 extending in the longitudinal direction of the shaft 162 is provided and the shaft 162 is made hollow, the acoustic wave propagating through the plate 9 can be efficiently transmitted to the piezoelectric element 12, which is preferable.

It is preferable that the vibration pickup terminal 16 has a spring pin structure or a spring terminal structure in which a spring (not shown) is accommodated in a hollow portion of the shaft portion 162 and an upper end of the spring is connected to the leg portion 161 and a lower end of the spring is connected to the tip portion 164, because the length of the vibration pickup terminal 16 can be automatically adjusted.

If the vertical total length of the vibration pickup terminal 16 is formed to be longer than the vertical total length of the housing 13 by a predetermined length (for example, several millimeters or so), the metal plate 11, the vibration pickup terminal 16, and the plate 9 can be kept in a state in which pressure is constantly applied between the metal plate 11, the vibration pickup terminal 16, and the plate 9, and therefore, the sensitivity to the acoustic wave propagating through the plate 9 can be improved, which is preferable.

For example, when a reception room and a waiting room in a hospital are partitioned by an acrylic resin plate or the like, by attaching the sound receiver 1 of the present embodiment to the acrylic resin plate on the reception room side (first space), it is possible to receive sound generated in the waiting room (second space) with high accuracy and reproduce it by a speaker provided on the reception room side, and thus, it is possible to talk and communicate between a person in the reception room and a person in the waiting room. For example, the same effect can be obtained even when the front seat and the rear seat (or the driver seat and the passenger seat) of a taxi are separated by an acrylic plate or the like.

For example, by attaching the sound receiver 1 of the present embodiment to a window glass or the like in the vehicle interior (first space), it is possible to receive sound generated outside the vehicle (second space) with high accuracy and reproduce it with a speaker provided in the vehicle interior, so that conversation and communication between a person in the vehicle and a person outside the vehicle are possible.