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Laminated piezoelectric body

A piezoelectric body and piezoelectric element technology, applied in the direction of circuits, electrical components, piezoelectric/electrostrictive/magnetostrictive devices, etc., can solve the complicated grinding process, the decline in yield, and the difficulty in improving the piezoelectric element segment Productivity and other issues, to achieve the effect of ensuring productivity, improving reliability, and improving durability

Inactive Publication Date: 2013-10-23
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the machining accuracy of the contact portion is improved, the yield will decrease due to grinding, and the grinding process will be complicated, making it difficult to increase the productivity of the piezoelectric element segment.

Method used

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  • Laminated piezoelectric body
  • Laminated piezoelectric body
  • Laminated piezoelectric body

Examples

Experimental program
Comparison scheme
Effect test

Deformed example 1

[0084] Such as Figure 8 As shown, in the piezoelectric element segment 60 of Modification 1, the lower contact portion 28A of the piezoelectric ceramic 13 of the first embodiment is replaced with the lower contact portion 61 , and the other structures are the same as those of the piezoelectric element segment 12A of the first embodiment.

[0085] The lower contact portion 61 is formed in a curved shape so as to protrude downward, and has a central convex portion 62 at the center. The central convex portion 62 is vertically symmetrical to the central convex portion 32 of the first embodiment. By providing the central convex portion 62 at the center of the lower contact portion 61, the central convex portion 62 can be directed toward the upper contact portion 29C of the piezoelectric element segment 12C ( figure 1 ) of the central protrusion.

[0086] The central convex portion 62 is a portion of the lower contact portion 61 formed in a curved shape so as to protrude downward...

Deformed example 2）

[0088] Such as Figure 9 As shown, in the piezoelectric element segment 70 of Modification 2, the upper contact portion 29A of the piezoelectric ceramic 13 of the first embodiment is replaced with the upper contact portion 71 , and the other structures are the same as those of the piezoelectric element segment 12A of the first embodiment.

[0089] The upper contact portion 71 is formed in a substantially trapezoidal shape so as to protrude upward and has a central convex portion 72 at the center. The central convex portion 72 has: a left cone surface (cone surface) 73 formed as an ascending slope from the left end portion 71 a of the upper contact portion 71 toward the axis 11; The right end portion 71 b is formed as an ascending slope toward the axis 11 ; and a horizontal flat surface 75 is formed between the upper end portion of the left tapered surface 73 and the upper end portion of the right tapered surface 74 .

[0090] This central convex portion 72 has: a left interse...

Deformed example 3）

[0098] Such as Figure 12 As shown, the piezoelectric element segment 80 of Modification 3 is the lower contact portion 78 of the piezoelectric element segment 70 of Modification 2 ( Figure 9 ) is replaced by the lower contact portion 81 , and the other structures are the same as those of the piezoelectric element segment 70 of Modification 2. The lower contact portion 78 of the piezoelectric element segment 70 is a portion formed flat like the lower contact portion 28A of the first embodiment.

[0099] The lower contact portion 81 of the piezoelectric element segment 80 is formed in a substantially trapezoidal shape so as to protrude downward and has a central convex portion 82 in the center. The central convex portion 82 is vertically symmetrical to the central convex portion 72 of Modification 2. As shown in FIG. By providing the central convex portion 82 at the center of the lower contact portion 81, the central convex portion 82 can be directed toward the upper contact...

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PUM

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Abstract

A laminated piezoelectric body (10) in which an internal positive electrode (15) and an internal negative electrode (16) are arranged at a predetermined distance from each other in the lamination direction of a plurality of piezoelectric element segments (12), while being arranged so as to be perpendicular to the lamination direction of the plurality of piezoelectric element segments (12). A piezoelectric element segment (12A) has an upper contact portion (29A) that comes into contact with a lower contact portion (28B) of an upper piezoelectric element segment (12B). The upper contact portion (29A) has a central projection (32), which protrudes toward the lower contact portion (28B), in the central portion.

Description

technical field [0001] The present invention relates to a laminated piezoelectric body comprising a plurality of piezoelectric element segments provided with at least a pair of internal electrodes inside piezoelectric ceramics, and the plurality of piezoelectric element segments are stacked. Background technique [0002] It is known that, for example, Patent Document 1 discloses a laminated piezoelectric body in which a plurality of piezoelectric elements and a plurality of internal electrodes are alternately laminated. The multilayer piezoelectric body can be driven by applying a voltage from the voltage supply unit to the internal electrodes of the multilayer piezoelectric body. By driving the laminated piezoelectric body to displace the laminated piezoelectric body, it can be used as an actuator, for example. [0003] In addition, among laminated piezoelectric bodies, there is a type in which a piezoelectric element segment is formed by providing a pair of internal elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L41/083H01L41/187H01L41/047H01L41/27H01L41/293H01L41/297H01L41/312H01L41/337
CPCH01L41/27H01L41/0477H01L41/187H01L41/0471H01L41/0831H01L41/0838H01L41/22H10N30/871H10N30/877H10N30/501H10N30/05H10N30/508
Inventor 须摩和浩
Owner HONDA MOTOR CO LTD
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