JPS61271146A - Buzzer device for automobile - Google Patents

Abstract

PURPOSE:To enlarge the volume of a rear chamber so as to install electric components with ease by configurating a device in such a way that the rear chamber is provided at the side of both a buzzer main body and a front chamber with a bulkhead provided which isolates the rear chamber from the front one but maintains communication with the section behind a diaphragm, and electric components are contained in the rear chamber. CONSTITUTION:A buzzer main body 10 includes a diaphragm 11, a coil 12, a magnet 13, and a iron core 14. Besides, the circumference of the diaphragm 11 is secured to a buzzer case 50. The buzzer case 50 contains the buzzer main body 10 and electric components 40, and comprises both a front chamber 20 and a rear chamber 30. And perforations for sound are provided at a position facing the diaphragm 11 of the front chamber 20. In this configuration, the rear section behind the diaphragm 11 is tightly sealed so that vibration waves generated behind the diaphragm 11 is not interfered by the rear chamber 30. Moreover, the rear chamber 30 is arranged at the side of both the buzzer main body 10 and the front chamber 20, and is separated from the front chamber 20 by a bulkhead 31 in a semi-circular form but is communicated with the section behind the diaphragm 11.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a technique for improving the sound pressure, pitch, and ease of installation of a buzzer device used in an automobile.

(Prior Art) As a conventional automobile buzzer device, for example, those shown in FIGS. 7 and 8 are known.

The automobile buzzer device OA shown in FIG. 7 is provided with a buzzer body 05 including a diaphragm 01, a coil 02, a magnet 03, and an iron core 04, and a front chamber 07 is provided in front of the buzzer body 05 by a buzzer case 06. was formed, a sound emitting hole 08 was provided in the front chamber 07, and the buzzer main body 05 was connected to an electrical component 09.

Note that the buzzer case 06 was open at the rear of the buzzer body 05.

Next, in the automobile buzzer device OB shown in FIG. 8, the rear side of the buzzer body 05 of the buzzer case 010 is
It was sealed by.

Note that the other configurations of this buzzer device OB are the same as those shown in FIG. 7, so the same configurations are denoted by the same reference numerals and the description thereof will be omitted.

Therefore, in both buzzer devices OA and OB, when current is intermittently passed through the coil 02, the diaphragm 01 vibrates, and the front chamber 0
The sound that resonated with 7 was being emitted from sound emitting hole 08.

(Problems to be Solved by the Invention) Automotive buzzer devices are required to be easy to install in a vehicle, have a high sound pressure that is easy to hear, and have a low frequency that is not harsh on the ears.

However, the conventional automotive buzzer device as described above has the following problems.

Buzzer case 06.010 equipped with buzzer body 05
Since the and electric component 09 are provided separately, it takes time and effort to attach them, and wiring between them and wiring is troublesome.

Furthermore, in the device OA shown in FIG. 7, since the rear part of the buzzer body 05 of the buzzer case 06 is open, although a low frequency sound can be obtained, when the diaphragm 01 vibrates, the rear part of the diaphragm 01 The rear waves generated on the sides wrap around to the front side due to diffraction and interfere with the front waves, resulting in a decrease in sound pressure and making it difficult to hear the sound.

Furthermore, in the device OB shown in FIG. 8, since the air behind the diaphragm 01 is sealed in the small chamber, a high sound pressure can be obtained, but the air reaction force in the small chamber due to the vibration of the diaphragm 01 is The sound becomes louder, the amplitude becomes smaller, and the frequency becomes higher, making the sound harsher.

(Means for Solving the Problems) The present invention aims to solve the above-mentioned conventional problems, and in order to achieve that purpose, the automotive buzzer device of the present invention includes a diaphragm, a coil, and a magnet. A front chamber is formed in front of a buzzer body comprising: a sound emitting hole provided in the front chamber; and the buzzer body is connected to an electrical component having an oscillation circuit. A rear chamber is provided on the sides of the buzzer body and the front chamber, the rear chamber is separated from the front chamber by a partition wall and communicated with the rear of the diaphragm, and the electric component is housed in the rear chamber, as described in I'17. This means that the rear chamber and the rear part of the buzzer body are sealed.

(Function) Therefore, in the automotive buzzer device of the present invention, since the rear chamber is provided on the side of the buzzer body and the front chamber, the shape of the buzzer device can be made thinner in the direction in which the sound emission hole is opened. In addition, the volume of the rear chamber can be increased without increasing the thickness in the opening direction.

In addition, by increasing the volume of the sealed rear chamber,
A high sound pressure can be obtained because the back wave does not attenuate the front wave, and moreover, the air reaction force applied to the diaphragm is weakened, the amplitude is increased, and low frequency sound can be obtained.

Furthermore, since the electrical components are already installed in the rear compartment, there is no need to install electrical components or wire when installing the vehicle to the vehicle body.

(Example) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

First, the structure of the first embodiment shown in FIGS. 1 to 3 will be explained.

A is an automobile buzzer device according to the first embodiment of the present invention,
Buzzer main body 10, front chamber 20, rear chamber 30, and electrical components 4
0.

The buzzer body 10 emits sound by vibration,
It is equipped with a diaphragm 11, a coil 1z, a magnet 13, and an iron core 14, and the coil 12, magnet 13, and iron core 1
4 is provided on the buzzer board 15 and is provided close to the diaphragm 11.

Note that the buzzer board 15 is fixed to a support 16.

Further, the diaphragm 11 has a disk shape, and its outer periphery is fixed to the buzzer case 50.

The buzzer case 50 houses the buzzer main body IO and the electrical components 40, and also forms a front chamber 20 and a rear chamber 30. As shown in the figure, the buzzer case 50 is constructed by having half of a cylinder embedded in a rectangular parallelepiped. It has a similar shape.

The front chamber 20 resonates with and amplifies any sound emitted by the buzzer body 10. The front chamber 20 is formed by the buzzer case 50 in front of the diaphragm 11, and has a cylindrical shape. doing.

Furthermore, a sound emitting hole 21 is provided in the front chamber 20 at a position facing the diaphragm 11 to emit the resonated sound.

The rear chamber 30 seals the rear of the diaphragm 11 so that vibration waves generated at the rear of the diaphragm 11 do not interfere with vibration waves at the front.
and is provided on the side of the front chamber 20, separated from the front chamber 20 by a semi-cylindrical partition wall 31, and communicated with the rear of the diaphragm 11.

Note that 32 is a rear communication chamber located behind the diaphragm 11;
33 allows the rear communication chamber 32 and the rear chamber 30 to communicate with each other. This is a communication port provided in the partition wall 31.

By the way, this rear chamber 30 can secure a large volume by being provided on the side of the buzzer main body 10 and the front chamber 20, but when the volume of the rear chamber 30 is increased in this way, the following will be explained. For this reason, the frequency of the diaphragm 11 can be lowered.

When the diaphragm 11 vibrates, the diaphragm 11 receives a reaction force due to the air pressure in order to compress the air in the rear chamber 30 and the rear communication chamber 32.

This reaction force reduces the volume of the rear chamber 30 and the rear communication chamber 32 to V
If the amount of change in volume due to deflection of the diaphragm 11 toward the iron core 14 is ΔV, it is proportional to ΔV/V.

Therefore, if the volume of the rear chamber 30 increases, the diaphragm 1
The reaction force against vibration 1 decreases, its amplitude increases, and the frequency decreases.

The electrical component 40 consists of an oscillation circuit 41 and a surge circuit 42 shown in FIG. 3, and serves to vibrate the buzzer body 10 and protect the first oscillation circuit 41. The board 51 is stored in the rear chamber 30.
．． It is set in.

Note that the support column 16 is fixed to the substrate 51.

The oscillation circuit 41, when energized, supplies an oscillating current (intermittent current) to the coil 12, vibrates the magnetic force generated in the iron core 14, and vibrates the diaphragm 11. , 412 and resistors.

The surge circuit 42 is a semiconductor 41 of the oscillation circuit 41.
1,412 from instantaneous high voltage, and this surge circuit 42 includes resistors 421. Diode 422. It is formed from a capacitor 423.

Note that 45 is a battery mounted on the vehicle.

52 is a bottom cover, which includes the rear chamber 30 and the buzzer body 1.
This bottom cover 52 is provided at the bottom of the buzzer case 50.

Further, the bottom cover 52 is made of synthetic resin, and also insulates the wiring of the substrate 51.

Note that 60 is a harness that supplies current to the buzzer device A.

Next, the operation of the first embodiment will be explained.

Since the volume of the sealed rear chamber 30 is large, high sound pressure can be obtained without interference from rear waves, and at the same time, low frequencies can be obtained.

Therefore, the sound emitted from the sound emitting hole 21 is loud and easy to hear, and is low and easy on the ears.

Further, when installing the device A of the first embodiment, it is only necessary to install the buzzer case 50.

Further, when the sound emitting hole 21 is mounted facing toward the vehicle interior, the depth in the direction opposite to the sound emission direction is shallow when viewed from the vehicle interior.

Next, the second embodiment device B shown in FIGS. 4 and 5 will be explained.

In this embodiment, a cylindrical partition wall 201 is provided, and a front chamber 20
This is an example in which a rear chamber 202 is formed around the entire circumference.

Note that the buzzer case 203 has a rectangular parallelepiped shape.

Next, the third embodiment device C shown in FIG. 6 will be explained.

In this embodiment, on the sound emitting hole 21 side of the buzzer case 301,
This is an example in which a resonance chamber 302 is formed.

Note that 303 is a resonance chamber sound emitting hole.

Therefore, the sound resonated in the front chamber 20 is further transmitted to the resonance chamber 3.
02, and a large sound pressure can be obtained.

In addition, regarding the 2nd and 3rd embodiments, the same components as in the 1st embodiment are given the same reference numerals, and the description thereof will be omitted.

Furthermore, explanations of the same functions as in the first embodiment will be omitted.

Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and the present invention may be modified without departing from the gist of the present invention. included.

For example, the volumes and shapes of the front chamber 20 and the rear chamber 30 may be arbitrarily determined depending on conditions such as the sound to be resonated and the installation location.

Alternatively, the buzzer main body 10 may be housed in a case with front and rear openings and then attached to the buzzer case.

(Effects of the Invention) As described above, according to the automotive buzzer device of the present invention, there is a buzzer on the side of the buzzer body and the front chamber, which is separated from the front chamber by the partition wall and communicated with the rear of the diaphragm. Since a rear chamber is provided, electrical components are housed in the rear chamber, and the back of the buzzer body is sealed between the rear chamber and the buzzer body, the following effects can be obtained.

(b) By making the sound emitting hole thinner in the opening direction, the sound emitting hole can be placed in thin spaces such as inside the instrument panel, door, or roof of a car, facing toward the interior of the vehicle. There are no restrictions on the placement location or direction of sound emission.

(b) By obtaining high sound pressure and low frequency at the same time,
The sound is easy to hear and is not harsh on the ears.

(c) Since there is no need for electrical parts or wiring when installing the device on the vehicle body, the installation work on the vehicle body is simple.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an automobile buzzer device according to a first embodiment of the present invention, FIG. 2 is a plan view showing the device according to the first embodiment, and FIG.
The figure is a circuit diagram showing the electrical components of the device of the first embodiment, FIG. 4 is a plan view of the device of the second embodiment, FIG. 5 is a vertical sectional view of the device of the second embodiment, and FIG. A vertical sectional view showing the embodiment device, and FIGS. 7 and 8 are vertical sectional views showing the conventional device. 10... Buzzer body 11... Vibration plate 12... Coil 13... Magnet 20... Front chamber 21... Sound emission hole 30.202... Rear chamber 31.201... Partition wall 40... Electrical components 41... Oscillation circuit patent application Nissan Shatai Co., Ltd. 1o... Fusa' Ippon Iki 3o ・ ・ Reward! 11. History of drive 31. Bulkhead 12.
・Coil 4o・・Electrical parts 13 ・・・7 Lines 20・・Kohmen room 21・・・Rokotsujimao Figure 3 “） 41・・Sponsor circuit Figure 2・Figure 6 et al. 2]

Claims (1)

[Claims] 1) A front chamber is formed in front of a buzzer body including a diaphragm, a coil, and a magnet, a sound emitting hole is provided in the front chamber, and the buzzer body includes an oscillation circuit. In the automotive buzzer device connected to an electrical component, a rear chamber is provided on the side of the buzzer body and the front chamber, and is separated from the front chamber by a partition wall and communicated with the rear of the diaphragm. A buzzer device for an automobile, characterized in that the electric component is housed in a rear chamber, and the back of the rear chamber and the buzzer body is sealed.