TW472497B - Vibration exciter - Google Patents

Abstract

A curved piezoelectric device (13) is attached to a plate (11) to vibrate the plate. Mass-loading is applied to at least one free end (14) of the piezoelectric device to increase output.

Description

472497 V. Description of the invention (1) The present invention relates to a piezoelectric vibration exciter, for example, a type that can be used to apply bending vibration energy to form a resonant panel with a resonance panel, and a speaker in the form of a panel using this exciter. Our international patent application W 0 7 7/0 9 8 4 2 describes such a resonant panel La D Ba and its vibration exciter. Many attempts have been made to provide piezoelectric devices with increased mechanical output displacement. Prior art devices include 'rainbow' piezoelectric actuators as well as more traditional piezoelectric actuators. Traditional piezoelectric actuators exhibit limited mechanical displacement. The output of a conventional piezoelectric device is limited by the fundamental piezoelectric displacement constant of the material. Due to the value of conventional devices of reasonable thickness (i.e., orders of a few millimeters), mechanical output motion in micrometers is provided. "Rainbow" actuators, and "Crescent" single and dual morphological piezoelectric actuators exhibit large mechanical output motion. However, even the finest ceramic wafers exhibit the largest observable output motion, providing a 3-4 cm device to limit the amount of movement displacement in the z-axis direction by approximately 1 mm. In addition, ceramic devices with a thickness of 0.25 m are particularly fragile and weak, so they can easily be damaged and require special treatment. U.S. Patent Nos. 5,632,841 and 5,802,195 and International Application W 0 9 6/3 1 3 3 3 describe high displacement ferroelectric devices. It is an object of the present invention to provide a piezoelectric device with enhanced output. According to the present invention there is provided a vibration exciter comprising a curved piezoelectric device having an attachment portion on which the device is attached to a substrate to vibrate and at least one vacant portion away from the attachment portion, and at least Provide a mass load on one or each vacant section.

O: \ 64 \ 64096.ptd Page 4 472497 V. Description of the invention (2) The piezoelectric device can be a ferroelectric device and can be a prestressed mass load. This pressure-bearing ferroelectric device can provide amazing The output greatly increases, about the order of the amplitude, when the device is used to drive a resonant curved swing panel. The device can be an arched shape or a general disc device. From another viewpoint, the present invention is a horn in the form of a resonance panel, which is driven by the resonance of the vibration exciter described above. Specific specific examples of the present invention will now be described, by way of example only, with reference to the accompanying drawings, wherein FIG. 1 shows a first specific example of a piezoelectric device according to the present invention, and FIG. 2 shows a second specific example FIG. 3 shows a third specific example, and FIG. 4 shows a fourth specific example. Referring to Fig. 1, a horn 1 includes a flat plate 11 that can support a resonant bending swing mode, as shown in W097 / 09842. A curved, synthetic piezoelectric device 13 such as that described in US 5 6 3 2 84 1 has an attachment portion 12 centrally disposed on the piezoelectric device. The attachment portion 12 is erected in a preferred, central position on the panel 11. The endpoint 14 of the device is vacant. A mass 15 is provided at each end of the piezoelectric device 13 to add a mass load to the end of the piezoelectric device to the piezoelectric vibration exciter to increase the output of the exciter. Figure 2 shows a similar configuration, except that instead of a single mass 15, a pair of masses 19 is provided at each end of the piezoelectric vibration exciter 13. In FIG. 3, the piezoelectric vibration exciter 21 is perfectly circular, and a panel attached to the center of the circle. A single mass 2 3 is provided on the vacant peripheral edge 2 5 of the exciter.

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1. Suction · On an I. The mass 2 3 is added to the piezoelectric vibration exciter to increase the output of the exciter. Fig. 4 shows an alternative arrangement in which the continuous ring 23 of Fig. 3 is replaced by a plurality of moderate masses 27, and the edges 25 of the piezoelectric device are arranged symmetrically. The invention therefore provides a simple way to increase the output of the exciter. Description of component symbols

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Claims (1)

47249 ^ 90Τ-ιο > η〇Ώ · — * Jkk 89108521 This year f 月 eve of the year 〇, amended-really please Φ Include a device to excite an excitement. •-• 8 a kind of Haihai = 口 = 0 Μ , 0} far 2 i (1 part to the part and attached) 11 1 1 Γν has a basic 'moving' vibrator 3 ί 1 skin / 1 \, the device should be equipped with a fratutj. W to the crimp One of the appendixes is placed in the installment to the next part: empty in the first supply for the purpose of the charge} negative special 2 (1 quantity, please apply to the quality application department as follows, 4, 2 Attachments β— The opening of the mouth is empty and there is one, or 0 installed voltage Xuan = the electric iron in the mouth which excites the excited item of the electric motor, which among the equipment h excites the one excited one of the excited item 2. The second set of enclosure electric fan Li Tie special please apply for 3) Such as Γ a · (3 set this device | Li Yi excited Zhen i item! 3 or 0 2 'Set 1 Such as the electric 4 · pressure J 〇 ^ 〇 Fan's shape-shaped arch special plate is please install the installation such as electricity 5. Voltage " > Γ1 Hai-δ in the | | Exciting vibration. Item 3 Touching sounds: Produced with production package, move 9 \ 一振 味 | Yi · _ 一一 一一 _ 6 can be set up one by one 6) 74 sounds (1 set of empty parts one by one) Attach one less one of them} 2, 11} 3 ΤΊ Ti-H 74 C Λ mouth to attach the electric remote bending and bending with a film to separate the part β — empty one or one small In order to increase the quality of the power supply and to increase the voltage, the dynamic swaying of Fan Quli f will be supported. Please support the application if possible. 7 • Banhe surface 0Α la the collar membrane is the board surface excitation Let's set the fine 8 / V installation voltage, which is the 0Λ \ Layi item 7 or 6 range. Li Dian specially asked Qu Shen to bend O: \ 64 \ 64096.ptc Page 1 2001.10.29. 008 4724IIZ g / lkfu 89108521 (o-month) 〇 Modification Six (1 3) is a ferroelectric device. 9. If the mouthpiece of item 8 of the patent application scope is a prestressed device.岣 0. As for the horn of item 6 or 7 of the scope of patent application • ^ 一. 一 ~-(1 3) is arched. Points 1 1. If the number 6 or 7 of the scope of application for patents is stab-shaped (1 3), it is dish-shaped. _ < '— ’wherein the ferroelectric device (1 3) wherein the piezoelectric device wherein the piezoelectric device O: \ 64 \ 64096.ptc Page 2 2001.10.29.009