JP2022087771A - Speaker device - Google Patents

Abstract

To provide a speaker device structured by a piezo speaker in a high-pitched sound region and a dynamic speaker in a bass range, in which an interference between an output of the piezo speaker and an output of the dynamic speaker is suppressed, and the size of speaker device is reduced.SOLUTION: An oscillation film of a piezo speaker 1, provided to a front surface of a housing 7 is oscillated by a dynamic speaker 2 provided so that all of them are existed in an inner part of the housing via a resonance space 3 provided to a back part of the piezo speaker 1.SELECTED DRAWING: Figure 2

Description

The present invention relates to improving the performance of a speaker device using a speaker using a piezoelectric element.

As the audio speaker device, a dynamic speaker, which is a speaker using electromagnetic force, is generally used. As one method for improving the performance of an audio speaker device, the use of a piezo speaker, which is a speaker that generates sound by using a piezoelectric element and has excellent responsiveness, is being studied. However, one of the drawbacks of piezo speakers is that they have poor bass output characteristics. A configuration is known in which a conventional speaker is used to supplement the bass region. (Patent Document 1). There, as shown in FIG. 4, a piezo speaker 10 for a high frequency range and a plurality of speakers 11 for a low frequency range are arranged in the vertical direction. FIG. 5 is an example of the output characteristics of this patent document. The output characteristic 12 is the output characteristic of the piezo speaker 10 for the high frequency range, and the output characteristic 13 is the output characteristic of the speakers for the low frequency range (plural).

French Patent Application Publication No. 2393501

According to the above-mentioned speaker device, the low-frequency output, which is insufficient for the piezo speaker, can be supplemented by the low-frequency speaker. However, since the speakers are arranged vertically, if the output of the piezo speaker and the output of the bass speaker interfere with each other, it is necessary to suppress the interference by taking a separate measure such as an equalizer. Further, since the speakers are arranged in the vertical direction, the speaker device becomes large, and there is a problem that it is not suitable for a small speaker device for a personal computer or the like.

In the present invention, in a speaker device that supplements the low frequency output that is insufficient with a piezo speaker with a dynamic speaker, the interference between the output of the piezo speaker and the output of the dynamic speaker is suppressed without a separate measure such as an equalizer, and a compact speaker. Provide the device.

The vibrating membrane of the piezo speaker provided on the front surface of the housing is added by the dynamic speaker provided so as to exist inside the housing through the resonance space provided on the back of the piezo speaker. Shake.

The vibrating membrane of the piezo speaker provided on the front surface of the housing is vibrated by the dynamic speaker provided so that the entire vibration membrane exists inside the housing via the resonance space provided on the back of the piezo speaker. By making this configuration, the treble region side of the dynamic speaker output is attenuated in the resonance space on the back of the piezo speaker, and the interference between the piezo speaker output and the dynamic speaker output is good output without any separate measures such as an equalizer. The characteristics are obtained.
In addition, the speaker device can be made compact by arranging the speakers in the front-rear direction.

It is a front view of the Example of the apparatus of this invention. FIG. 3 is a cross-sectional view taken along the line AA of FIG. It is an output characteristic of an Example of the apparatus of this invention. It is sectional drawing of the Example of the prior art document. It is an output characteristic of an Example of a prior art document.

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1 is a front view of an embodiment of the apparatus of the present invention, FIG. 2 is a cross-sectional view of an embodiment of the apparatus of the present invention, 1 is a piezo speaker (a metal plate with piezoelectric ceramics bonded), and 7 is a housing. Reference numeral 2 is a dynamic speaker (moving coil type). The piezo speaker 1 has a resonance space 3 and a sound passage 5. The dynamic speaker 2 has a resonance space 4 and a sound passage 6. The dynamic speaker 2 is provided so as to sandwich the piezo speaker 1 and the resonance space 3. With this configuration, as a characteristic of the resonance space 3, the sound attenuation increases as the sound becomes higher. Therefore, among the sounds output from the dynamic speaker 2, the sound in the high-pitched sound region is attenuated while being transmitted through the resonance space 3. , Interference with the output of the piezo speaker 1 is suppressed. Then, the sound in the bass region with small attenuation vibrates the vibrating membrane of the piezo speaker 1, and the insufficient output in the bass region of the piezo speaker 1 can be compensated. FIG. 3 is an output characteristic (schematic diagram) of the apparatus of the present invention. The output characteristic 8 is due to the piezo speaker 1, and the output characteristic 9 is due to the vibrating membrane of the piezo speaker 1 excited by the dynamic speaker 2. The output characteristic of the dynamic speaker 2 is attenuated as the sound becomes higher.
By synthesizing these two characteristics, good characteristics can be obtained from the low range to the high range.

Like a general audio device, the piezo speaker 1 has a resonance space 3 and a sound passage 5, and the dynamic speaker 2 has a resonance space 4 and a sound passage 6, and has good output characteristics due to so-called Helmholtz resonance. Further, as the adjustment of the sound quality, it is possible to provide a sound absorbing material and a reflector in the housing, such as adding a phase adjusting function and an equalizer function for the drive signals of the piezo speaker 1 and the dynamic speaker 2.

By arranging the dynamic speaker 2 to be provided on the back side of the piezo speaker 1, the resonance space 3, the sound passage 5, and the resonance space 4 sound passage 6 of the piezo speaker 1 are provided between the two side plates of the housing 7. Can be formed and the size of the speaker device can be made compact.

1 Piezo speaker 2 Dynamic speaker 3 Resonance space of piezo speaker 4 Resonance space of dynamic speaker 5 Sound passage of piezo speaker 6 Sound passage of dynamic speaker 7 Housing 8 Output characteristics of piezo speaker 9 Output characteristics of piezo speaker 9 Vibration membrane output characteristics 10 Piezo speakers 11 Bass speakers 12 Piezo speakers output characteristics 13 Bass speaker output characteristics

Claims (4)

The vibrating membrane of the speaker using the piezoelectric element provided on the front surface of the housing is inside the housing through the resonance space in the resonance space and sound passage provided on the back side of the speaker. A speaker device that is vibrated by a speaker that uses electromagnetic force so that it exists. In claim 1, a speaker device in which a speaker using electromagnetic force has a resonance space and a sound passage. In claim 1, a speaker device in which a speaker using electromagnetic force is arranged on the back side of a speaker using a piezoelectric element. In claim 2, the resonance space corresponding to the speaker using the electromagnetic force is a speaker device arranged inside the sound passage of the resonance space corresponding to the speaker using the piezoelectric element.

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