JP2001238285A - Hybrid type loudspeaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a loudspeaker employing a piezoelectric vibrator that increases a bass sound pressure in the loudspeaker. SOLUTION: A piezoelectric vibrator 16 and conduction type vibrations 20, 32 are fitted to an acoustic digital signal 12 via a high frequency sound primary diaphragm 14 and a low frequency sound primary diaphragm 18. The middle part of the piezoelectric vibrator 16 is fitted to the high frequency sound primary diaphragm 14 via a connection member 16a. In the conduction type vibrations 20, 32, voice coils 20c, 32c are placed around magnetic exciting elements 20b, 32b in housings 20a, 32a and the magnetic exciting elements 20b, 32b are fitted to the housings 20a, 32a in a freely reciprocating way.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hybrid speaker including a piezoelectric vibrator and a conductive vibrator.

[0002]

2. Description of the Related Art A speaker provided with a piezoelectric diaphragm is known as a sound source of a speaker system. For example, Japanese Utility Model Registration No. 3037167 by the applicant of the present application discloses a speaker structure using a piezoelectric element such as a bimorph as a sound source of a speaker system. In this speaker, a piezoelectric diaphragm is attached to an acoustic diaphragm made of a fiber-reinforced plastic such as carbon fiber to use as a sound source of the speaker.

[0003]

The piezoelectric vibrating plate is particularly excellent in high sound characteristics. However, the amplitude of the piezoelectric vibrating plate is small. Therefore, it is difficult to sufficiently increase the sound pressure of a low sound using the piezoelectric vibrating plate. Met.

[0004]

SUMMARY OF THE INVENTION The present invention provides a hybrid type having a piezoelectric vibrator and a conductive vibrator attached to an acoustic diaphragm via a treble primary diaphragm and a bass primary vibrator. In the loudspeaker, the piezoelectric vibrator is attached to the high-frequency primary diaphragm via a connecting member at the center, and the conductive vibrator has a voice coil around the magnetic vibrator in the housing. The gist of the present invention is a hybrid speaker in which a magnetic vibrator is attached to a housing so as to be reciprocally movable.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a first embodiment of the present invention will be described with reference to FIG. The speaker 10 according to the first embodiment includes a piezoelectric vibrator 16 attached to an acoustic diaphragm 12 via a high-frequency primary diaphragm 14. The treble primary diaphragm 14 is attached to one side surface of the acoustic diaphragm 12 with an adhesive. The piezoelectric vibrating body 16 includes a piezoelectric vibrating plate 16b formed by forming ceramic layers on both sides of a circular thin plate made of metal such as aluminum or stainless steel. The piezoelectric diaphragm 16b is attached to the treble primary diaphragm 14 with an adhesive or the like at a central portion thereof via a connecting member 16a. The acoustic diaphragm 12 is preferably made of gypsum board or Styrofoam and has a thickness of at least 5 mm, more preferably 10 mm to 20 mm.

In the acoustic diaphragm 12, a piezoelectric vibrating body 16
The conductive type vibrating body 2
0 is attached via the low frequency primary diaphragm 18. The low frequency primary diaphragm 18 can be formed of a relatively hard thin plate made of the same material as the high frequency primary diaphragm 14. The conductive-type vibrator 20 includes a permanent magnet 20 b as a magnetic vibrator provided in a housing 20 a so as to be capable of reciprocating in a direction perpendicular to the acoustic diaphragm 12, and a permanent magnet 20.
and a frame 20d supporting the housing 20a.
The conductive vibration body 20 is attached to the low frequency primary vibration plate 18 by a plurality of screws 20e.

Next, a second embodiment of the present invention will be described with reference to FIG. The speaker 30 according to the second embodiment of the present invention includes a piezoelectric vibrating body 16 attached to the acoustic diaphragm 12 via a treble primary diaphragm 14 and a bass primary vibration plate 18.
And a conductive-type vibrating body 32. In the second embodiment, the treble primary diaphragm 14, the bass primary vibration plate 18, and the piezoelectric vibrating body 16 are configured in the same manner as in the first embodiment. Conductive vibrator 32 according to second embodiment
Is the acoustic diaphragm 1 in the bottomed housing 32a.
The permanent magnet 32b includes a permanent magnet 32b as a magnetic vibrator that is reciprocally movable in a direction perpendicular to the direction 2 and a voice coil 32c disposed around the permanent magnet 32b.
The housing 32a has a flange 32e along the opening facing the low frequency primary vibration plate 18 in the housing 32a, and the housing 32a is attached to the low frequency primary vibration plate 18 by the flange 32e. I have. The housing 32a can be attached to the low frequency primary diaphragm 18 with a plurality of screws (not shown) or an appropriate adhesive similar to the first embodiment.

[0008]

According to the present invention, it is possible to improve the bass characteristics of a speaker using a piezoelectric vibrator and to increase the sound pressure in the bass range.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a first embodiment of the present invention.

FIG. 2 is a side sectional view of a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Speaker by embodiment of this invention 12 ... Acoustic diaphragm 14 ... Primary diaphragm for treble 16 ... Piezoelectric vibrator 18 ... Primary diaphragm for bass 20 ... Conductive type vibrator 32 ... Conductive type vibrator

Claims (1)

[Claims] 1. A hybrid speaker comprising a piezoelectric vibrator and a conductive vibrator attached to an acoustic diaphragm via a treble primary diaphragm and a bass primary vibrator, wherein the piezoelectric vibrator is The center part of the conductive vibrator is attached to the magnetic vibrator around the magnetic vibrator within the housing, and the magnetic vibrator is mounted on the housing. A hybrid speaker that can be reciprocated.