JP6567462B2 - Electronic horn - Google Patents

Description

  The present invention relates to an electronic horn, and more particularly to an electronic horn capable of obtaining a sufficient warning sound output with a compact shape.

  An electronic sounding device generates a warning sound by vibrating a plate-like vibrating body with a piezoelectric material, and has features such as being more compact and having a longer life than a conventional electromagnetic sounding device. However, the alarm sound generated from the vibrating body is relatively small, and normally the alarm sound is amplified and output by a resonator. Furthermore, in Patent Document 1, a plate-shaped horn cap is provided in front of the resonator so that the directivity of the output sound can be adjusted according to the application.

JP2010-157886

  However, the plate-shaped horn cap still has a problem that it is difficult to efficiently output the alarm sound output from the resonator forward with sufficient directivity.

  Therefore, the present invention solves such problems, and an object of the present invention is to provide a compact electronic horn that can output a warning sound with sufficient directivity forward.

In order to achieve the above object, in the first invention, a plate-like vibrating body (51), a piezoelectric body (52) that vibrates the vibrating body (51), and an opening (71) are provided in part. The resonator (7) which covers the front of the vibrating body (51) and forms a resonance space (S) with the vibrating body (51) communicates with the resonator (7) and the opening (71). A buffer chamber (BR) and one or more first sound chambers that guide the alarm sound output through the buffer chamber (BR) forward or rearward on the outer peripheral side through a path that reversely curves while gradually expanding in diameter. MH1) and a second loudspeaker chamber (MH2) for reflecting the alarm sound guided rearwardly on the outer peripheral side by the first loudspeaker chamber (MH1) toward the front on the outer peripheral side, and the resonator ( 7) An inner cylinder (62) and an outer cylinder (63) located inside and outside are provided in front of 7). A circular cover body (8) is provided so as to cover the inner cylinder body (62) and the outer cylinder body (63) from the front, and the cylinder walls and covers of the inner cylinder body (62) and the outer cylinder body (63). The body (8) forms the buffer chamber (BR), the first loudspeaker chamber (MH1), and the second loudspeaker chamber (MH2) around the opening (71) of the resonator (7), And the center part of the said cover body (8) is depressed toward the opening (71) of the said resonator (7), Between the front-end | tip of the said center part and the opening (71) of the said resonator (7), the said A buffer chamber (BR) is formed, and a portion of the first loudspeaker chamber (MH1) following the buffer chamber (BR) is formed on the outer periphery of the central portion.

In the first aspect of the present invention, the alarm sound output from the opening of the resonator is resonantly amplified by the megaphone effect of one or a plurality of first loudspeakers and the subsequent second loudspeaker, and has sufficient directivity and has a sufficient directivity. Is output efficiently. In this case, since the one or a plurality of first loudspeakers exhibiting the megaphone effect, and the first loudspeaker chamber and the second loudspeaker chamber are connected in series in a radial direction by a passage that curves in an inverted manner, Does not protrude greatly in the front-rear direction and becomes a compact shape. Further, since the first loudspeaker room and the second loudspeaker room are provided on the entire circumference, the alarm sound can be output more efficiently forward with directivity.

In the second aspect of the invention , the outer peripheral edge (53) of the plate-like vibrating body (51) is supported by being sandwiched from both sides, and the outer peripheral end (511) of the vibrating body (51) is attached to the wall of the sounder main body. It is located away from the inner surface (241).

In the second invention , even if the temperature around the sounder rises or falls and the inner surface of the wall of the vibrating body or the sounder body expands or contracts, the outer peripheral end of the vibrating body remains on the wall inner surface of the sounder body. Since they do not come into contact with each other, there is no problem that the compression or tensile stress is generated in the plate of the vibrating body and the amplitude thereof changes.

  The reference numerals in the parentheses refer to the correspondence with specific means described in the embodiments described later.

  As described above, according to the electronic alarm device of the present invention, it is possible to output an alarm sound with sufficient directivity forward, and to make the alarm device body compact. Is

It is sectional drawing of the electronic sound alarm which shows one Embodiment of this invention, and is sectional drawing along the II line | wire of FIG. It is a front view of an electronic horn. It is a side view of an electronic horn. It is sectional drawing of a vibrating body clamping part, and is an expanded sectional view of the A section of FIG. It is sectional drawing of the electronic sound alarm which shows other embodiment of this invention.

  The embodiment described below is merely an example, and various design improvements made by those skilled in the art without departing from the gist of the present invention are also included in the scope of the present invention.

(First embodiment)
FIG. 1 shows an overall cross-sectional view of an electronic sound alarm, FIG. 2 shows a front view thereof, and FIG. 3 shows a side view thereof. The horn main body includes a circular cylindrical metal plate casing 1 that opens in the front-rear direction (left-right direction in FIG. 1) in a state of being installed in the vehicle. A container-shaped resin holder 2 that opens forward is held in the cylinder of the casing 1, and a warning signal generator, an amplifier circuit, and the like are formed on the bottom wall of the holder 2 in parallel with the holder 2. A circuit board 4 provided with a sound circuit 3 is disposed. The circuit board 4 is supported by a plurality of spacers 21 erected on the bottom wall of the holder 2. An attachment stay 22 is bolted to the outer surface of the bottom wall of the holder 2.

  A vibrating plate 51 made of a metal plate that constitutes the piezoelectric element sounding body 5 together with the piezoelectric body 52 described below is stretched in parallel with the circuit board 4 by closing the opening of the holder 2. The outer peripheral edge of the vibrating body 51 is sandwiched between the opening edge of the holder 2 and the outer peripheral edge 61 of the resin intermediate body 6 covered with the opening of the holder 2. Details of the sandwiching portion are shown in FIG. In FIG. 4, the opening edge 23 retreated to the step of the holder 2 that sandwiches the outer peripheral edge 53 of the vibrating body 51 has an outer peripheral part of the outer periphery 61 away from the outer peripheral edge 53, and then the outer peripheral edge 61 outer periphery of the intermediate body 6. It becomes the opening standing wall 24 which touches. The outer peripheral end 511 of the vibrating body 5 is located inward from the inner surface 241 of the standing wall 24 by a gap d. As a result, even if the temperature around the sounder rises or falls and the inner surface 241 of the vibrating body 51 or the standing wall 24 expands or contracts, the outer peripheral end 511 of the vibrating body 51 contacts the wall inner surface 241 of the sounder body. There is no contact. Thereby, the malfunction which a compression or a tensile stress arises in the board of the vibrating body 51 with the rise or fall of temperature, and the amplitude changes is avoided.

  In FIG. 1, a circular piezoelectric body 52 is bonded to the center of the back surface of the vibrating body 51. From the circuit board 4, one electrode (not shown) of the piezoelectric body 52 and the other electrode (not shown) of the piezoelectric body 52 ( Output lines (not shown) extend to the vibrating bodies 51 that lead to (not shown). The alarm circuit 3 on the circuit board 4 is connected to a power feeding connector 11 provided outside the casing 1 (FIG. 3).

  The intermediate body 6 includes an inner cylinder body 62 and an outer cylinder body 63. The inner cylinder 62 is formed in a relatively deep container shape that opens forward, and its bottom wall extends radially outward to form the outer peripheral edge 61. The outer peripheral edge 61 is covered with the opening of the holder 2 while narrowing the outer peripheral edge of the vibrating body 51, and is fixed by caulking with the opening edge of the casing 1. The bottom wall of the inner cylindrical body 62 is bent and protruded in a mountain shape into the cylinder, and constitutes the resonator 7 in which the resonance space S is formed with the vibrating body 51. A circular opening 71 is formed at the top of the bottom wall constituting the resonator 7.

  The inner cylinder 62 is surrounded by an outer cylinder 63. The outer cylinder 63 is formed in a relatively shallow container shape, and an opening 631 in the bottom wall thereof is fitted on the outer periphery of the cylinder wall of the inner cylinder 62. That is, ribs 632 are formed on the outer cylindrical body 63 at three positions on the periphery of the opening 631, and these ribs 632 are formed in three circumferential directions on the outer periphery of the cylindrical wall of the inner cylindrical body 62. It fits in the extending groove 621. The outer peripheral cylindrical wall 633 of the outer cylindrical body 63 expands forward and outward, and the whole is a reflecting plate.

  A cover body 8 is provided to cover the front of the intermediate body 6. The cover body 8 has a circular shape with a smaller diameter than the outer cylindrical body 63, and the central portion thereof is greatly depressed toward the bottom wall opening 71 of the inner cylindrical body 62, and the outer peripheral portion has a cross-sectional shape that is curved in a substantially arc shape. It has become. The outer peripheral edge of the cover body 8 reaches an intermediate position between both the cylindrical walls of the inner cylindrical body 62 and the outer cylindrical body 63. On the outer peripheral edge of the cover body 8, inwardly extending stay portions 81 are formed at three locations in the circumferential direction, and the tips of the stay portions 81 are fitted into grooves 621 on the outer periphery of the cylinder wall of the inner cylinder body 62. doing.

  With the above structure, a buffer chamber BR having a predetermined capacity communicating with the resonator 7 and the opening 71 between the inner cylindrical body 62 and the cover body 8 (partitioned by a chain line in FIG. 1). Space), a first loudspeaker chamber MH1 that guides the alarm sound output from the buffer chamber BR to the rear side on the outer peripheral side through a passage that is inverted and curved while gradually expanding the diameter, and an alarm sound guided to the rear side on the outer peripheral side Is further formed around the entire circumference of the second loudspeaker chamber MH2 that reflects the sound toward the front on the outer peripheral side.

  When the output signal of the warning sound circuit 3 is input to the piezoelectric element sounding body 5, a sound output is emitted from the piezoelectric element sounding body 5. This sound output is amplified in a specific frequency component suitable for alarm in the resonator 7, and the amplified alarm sound passes through the opening 71 and reaches the first loudspeaker chamber MH <b> 1 from the buffer chamber BR. Then, the first loudspeaker chamber MH1 is guided by a passage that gradually reverses its diameter while being gradually expanded, changes its direction outward in the radial direction, and enters the second loudspeaker chamber MH2 to enter the second loudspeaker chamber MH2 in the radial direction. Reflected and output toward the outside front.

  In this way, the alarm sound output from the resonator 7 is efficiently amplified forward with sufficient directivity while being resonantly amplified by the megaphone effect of the first loudspeaker chamber MH1 and the second loudspeaker chamber MH2. Is output. In the present embodiment, the first loudspeaker chamber MH1 and the second loudspeaker chamber MH2 exhibiting the megaphone effect are arranged in series in the radial direction by a path that curves in an inverted manner, so that the horn main body protrudes greatly in the front-rear direction. It becomes a compact shape without doing.

(Second Embodiment)
In the above embodiment, one first loudspeaker chamber MH1 is provided. However, as shown in FIG. 5, three first loudspeaker chambers MH1 are provided and guided radially outward by the first loudspeaker chamber MH1. If the warning sound whose direction is changed backward is reflected and output in the second loudspeaker chamber MH2 toward the front in the radial direction, a warning sound with better directivity and better sound quality can be obtained. In this embodiment, the alarm circuit is provided outside the main body of the alarm device. In FIG. 5, the same members as those in the first embodiment are denoted by the same reference numerals. The first loudspeaker chamber MH1 may be provided with an odd number of five or more, or an even number.

DESCRIPTION OF SYMBOLS 1 ... Casing, 2 ... Holder, 3 ... Alarm circuit, 4 ... Circuit board, 5 ... Piezoelectric element sounding body, 51 ... Vibrating body, 52 ... Piezoelectric body, 6 ... Intermediate body, 62 ... Inner cylinder, 63 ... Outside Cylindrical body, 7 ... resonator, 71 ... opening, 8 ... cover body, BR ... buffer chamber, MH1 ... first loudspeaker chamber, MH2 ... second loudspeaker chamber, S ... resonance space.

Claims (2)

A plate-like vibrating body; a piezoelectric body that vibrates the vibrating body; a resonator that has an opening in a part thereof and covers the front of the vibrating body to form a resonance space with the vibrating body; and the resonator And a buffer chamber communicated by the opening, and one or a plurality of first sound chambers for guiding an alarm sound output through the buffer chamber forward or rearward on the outer peripheral side by a passage that reversely curves while gradually expanding in diameter. A second loudspeaker chamber that further reflects the alarm sound guided rearwardly on the outer peripheral side by the first loudspeaker chamber toward the front on the outer peripheral side , and is located inside and outside in front of the resonator. And a circular cover body so as to cover the inner cylinder body and the outer cylinder body from the front, and the resonator wall is opened by the cylinder wall and the cover body of the inner cylinder body and the outer cylinder body. The buffer chamber, the first loudspeaker chamber and the second loudspeaker chamber all around the center And forming the buffer chamber between the front end of the central portion and the opening of the resonator, by recessing the central portion of the cover body toward the opening of the resonator, and the first loudspeaker chamber An electronic audible alarm characterized in that a portion following the buffer chamber is formed on the outer periphery of the central portion . 2. The electronic alarm according to claim 1, wherein the outer peripheral edge of the plate-like vibrating body is supported by being sandwiched from both sides, and the outer peripheral end of the vibrating body is positioned away from the inner surface of the chamber wall of the alarm device body. Sounder.

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