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Piezoelectric resonator and its parts

A piezoelectric resonator and piezoelectric technology, applied in the direction of electrical components, impedance networks, etc., can solve problems such as inability to produce stable oscillations, uneven connection areas, and unstable bonding strength

Inactive Publication Date: 2004-11-10
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Since the piezoelectric resonant component uses the fundamental wave vibration mode, when the piezoelectric material is mounted on the dielectric substrate, the change in viscosity of the conductive adhesive at the time of connection will make the connection area uneven, and the adhesive will often Diffusion, thus making the bond strength unstable
Therefore, suppression of vibrational energy by piezoelectric resonant parts deteriorates resonance performance, and failure to completely suppress unnecessary vibrations further deteriorates resonance performance
Therefore, piezoelectric resonant parts are generally unable to generate stable oscillations such as no jump oscillations, etc.

Method used

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  • Piezoelectric resonator and its parts
  • Piezoelectric resonator and its parts
  • Piezoelectric resonator and its parts

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0068] Fig. 1 shows the structure of a piezoelectric resonator of an embodiment of the present invention. The piezoelectric resonator is equipped with: a piezoelectric substrate 1 with a pair of opposite surfaces 1a and 1b and an effective Poisson's ratio smaller than 1 / 3; Corresponding to the opposite surfaces 1a, 1b.

[0069] The opposite surfaces 1a, 1b of the piezoelectric base layer 1 have almost the same shape, such as a rectangle, respectively. A rectangular shape as referred to herein is a substantially sensed shape. So, slightly off corners or corners that are not exactly 90 degrees are allowed. The sum α of the length of the vertical side of one of the opposite surfaces 1a, 1b and the length of the other side of the opposite surface is limited to a range of 2.22 to 2.24mm or 2.34 to 2.48mm. That is to say, assuming that the length of the one side is Lc and the length of the other side is Wc, the relationship between the length Lc of the one side and the length Wc ...

example 1

[0097] Examples of the present invention are described below.

[0098] As a starting material, bismuth oxide (Bi 2 o 3 ), lanthanum oxide (La 2 o 3 ), titanium oxide (TiO 2 ), strontium carbonate (SrCO 3 ) and manganese carbonate (MnCO 3 ) The raw material powder that constitutes, weigh the weight of said raw material to provide by (Sr 0.9 La 0.1 ) Bi 4 Ti 4 o 15 Composition, weigh the weight of manganese carbonate as (Sr 0.9 La 0.1 ) Bi 4 Ti 4 o 15 0.5% by mass. The weighed material was subjected to ball milling mixing with zirconia spheres in pure water for about 15 hours. The mixed raw material powder was completely dried by pressing at a temperature of 800° C. and the raw material was calcined. Subsequently, the calcined material was again subjected to ball mill pulverization, dried and granulated by adding an appropriate amount of polyvinyl alcohol as a binder. After granulation, the granulated powder was formed on a sheet of length 20 mm x width 20 mm x...

no. 2 example

[0122] A second embodiment of the present invention will be described below with reference to the drawings.

[0123] Fig. 6 is a perspective view schematically showing the structure of a piezoelectric resonator according to a second embodiment of the present invention. The piezoelectric resonator includes: a piezoelectric base 1 with a pair of opposite surfaces 1a and 1b and an effective Poisson's ratio smaller than 1 / 3; The opposite surfaces 1a, 1b correspond. This structure is similar to that of the first embodiment.

[0124] The opposite surfaces 1a, 1b of the piezoelectric base layer 1 have almost the same shape, such as a rectangle, respectively. A rectangular shape as referred to herein is a substantially sensed shape. So, slightly off corners or corners that are not exactly 90 degrees are allowed. The length Lc of one side of the opposite surfaces 1a, 1b is limited to the distance between the opposite surfaces 1a, 1b as shown in Equation 2-1, ie, 5 times or less tha...

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Abstract

A piezoelectric substrate is constituted by a piezoelectric material of an effective Poisson's ratio being less than 1 / 3. The substrate has a pair of opposite faces and the opposite faces are provide with a pair of vibrating electrodes in correspondence. The opposite faces of the piezoelectric substrate are rectangular respectively. The sum of the lengths Lc of the one faces in the opposite faces 1a, 1b and the length Wc of the other side of the same is limited within range 2.22 mm <= <= 2.24 mm or 2.34 mm <= = 2.48 mm, said one faces being vertical each other. The areas Sc of the opposite faces are 1.22 mm<2> <= Sc <= 1.26 mm<2> or 1.35 mm<2> <= Sc <= 1.538 mm<2>. Accordingly, though using the piezoelectric material of the effective Poisson's ratio being less than 1 / 3, vibration in the thickness extensional fundamental waves can be steadily utilized.

Description

technical field [0001] The present invention relates to a piezoelectric resonator and a piezoelectric resonator component. Background technique [0002] Piezoelectric resonators using piezoelectric ceramics have been widely used for filters, resonators, or sensors. Specifically, piezoelectric materials such as lead titanate (PT) and lead zirconate titanate (PZT) are less expensive than piezoelectric materials called crystals composed of single crystals. This material has been widely used as a resonator for generating the basic signal ( base clock signal). However, since these piezoelectric materials contain lead (Pb), it is necessary to develop a lead-free piezoelectric material for the sake of environmental consideration. [0003] As lead-free piezoelectric materials, for example, compounds having a perovskite structure and solid solutions thereof, compounds having an ilmenite structure, and solid solutions thereof such as tantalate compounds or niobate compounds, compou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H9/15H03H9/02H03H9/10H03H9/17
CPCH03H9/0504H03H9/1014H03H9/177H03H9/0207H03H9/02157H03H9/15
Inventor 铃木利幸三木信之广濑正和井上正良
Owner TDK CORPARATION
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