Sensor device and electronic apparatus

A sensor device and electrode technology, applied in electromagnetic measurement devices, piezoelectric devices/electrostrictive devices, instruments, etc., to achieve the effect of no temperature drift and high detection efficiency

Active Publication Date: 2015-01-28
MURATA MFG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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In Patent Document 1, although this kind of general use is described, its construction method is only descr

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  • Sensor device and electronic apparatus
  • Sensor device and electronic apparatus
  • Sensor device and electronic apparatus

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Embodiment Construction

[0040] First of all, on the basis of understanding the principle of the present invention, a detailed description will be given of the reference technology.

[0041] Polylactic acid (PLA) is a dehydration condensation polymer obtained by ring-opening polymerization of lactide which is a cyclic dimer of lactic acid. Lactic acid is chiral because it contains an asymmetric carbon. Therefore, L-form and D-form exist in PLA, and their polymers are called L-type polylactic acid (PLLA) and D-type polylactic acid (PDLA), respectively. The main chain of PLLA is a left-handed helical structure, and the main chain of PDLA is a right-handed helical structure. The type of L-body and D-body is determined by the type of microorganisms such as fungi used in the synthesis of lactic acid. Most of the currently mass-produced and utilized PLAs are PLLA. Therefore, PLLA will be described below.

[0042] As mentioned above, PLLA is a chiral polymer, in figure 1 The helical structure of its ma...

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Abstract

Provided is a sensor device which employs a piezoelectric film, formed from a chiral polymer such as polylactic acid, in sensing a displacement. A sensor device comprises: a film (21) formed from, for example, PLLA; and electrodes for extracting an output voltage from the PLLA film (21), and which are formed on both primary surfaces of the PLLA film (21) in a state of mutually facing one another and sandwiching at least a portion of the PLLA film (21). A first edge (24) of the PLLA film (21) is fixed, and a second edge (25) which is opposite thereto is a movable part (28). The electrodes are made to extract an output voltage by an effect of a piezoelectric constant (d14) which is caused by a shear deformation which arises by a displacement of the movable part (28) in a parallel direction to the primary surfaces of the PLLA film (21), and is capable of sensing an operation caused by friction, etc.

Description

technical field [0001] The present invention relates to a sensor device and an electronic device, and particularly relates to a sensor device including a piezoelectric film made of a chiral polymer, and an electronic device constituted by the same. Background technique [0002] For example, in Japanese Patent Application Laid-Open No. 5-152638 (Patent Document 1), it is described that by stretching a molded article of polylactic acid, a film having a piezoelectric constant d can be obtained. 14 content of the piezoelectric film. That is, if Figure 19 As shown, in the piezoelectric film 11 made of polylactic acid, electrodes (not shown) are respectively formed on the upper and lower surfaces in the figure, and are extended along the "3" axis direction. When an electric field is applied along the normal direction of the electrode surface, that is, the direction of the "1" axis, shear deformation occurs in the direction of the rotation of the "1" axis, that is, the direction ...

Claims

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Application Information

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IPC IPC(8): G01B7/16G06F3/041H01L41/08H01L41/193
CPCH01L41/0805G06F2203/04105H01L41/053G06F3/041H01L41/1132H01L41/193G01L1/16H10N30/883H10N30/302H10N30/857
Inventor 田实佳郎安藤正道
Owner MURATA MFG CO LTD
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