Matsushita Electric Industrial Co., Ltd.

Shogo Matsubara

Takanori Nakano

Kazuo Nishimura

Masakazu Tanahashi

Masaichiro Tatekawa

Shintaro Hara

Yosuke Mizuyama

Hiroyuki Matsuo

Hideaki Horio

Osamu Watanabe

Shinji Morimoto

Kazunari Chikanawa

Shoichi Shimizu

Shinichiro Kaneko

It is an object of the invention to provide an aberration correcting mirror which has a small size, power saving, a low voltage, a low price and high precision. In particular, it is an object to provide a practical mirror for correcting a spherical aberration. The invention provides an aberration correcting mirror constituted by a substrate, a piezoelectric unit, a pair of electrode films interposing the piezoelectric unit therebetween, an elastic unit and an optical reflective film, wherein the substrate has a cavity portion which is schematically symmetrical about an optical axis, each of the pair of electrode films is divided into at least two parts including a first electrode and a second electrode, the first electrode being schematically symmetrical about the optical axis and the second electrode being provided to surround the first electrode, and such an electric potential as to set the directions of electric fields in the piezoelectric unit to be reverse to each other is applied to the first electrode and the second electrode.

Optical pick-up aberration correcting mirror, aberration correcting method and optical pick-up

A piezoelectric actuator is constructed by forming a common electrodeof Cr, a piezoelectric layerof Pb(Zr,Ti)O, a cover layerof BaTiO, and an individual electrodeof Pt in this order into a laminate. The thickness of the piezoelectric layerin the lamination direction (T) and the thickness of the cover layerin the lamination direction (T) satisfy the relationship of 0.08&#x2266;T/T&#x2266;1. The relative dielectric constant of the piezoelectric layer(&#x3b5;r) and the relative dielectric constant of the cover layer(&#x3b5;r) satisfy the relationship of &#x3b5;r/&#x3b5;r

Piezoelectric actuator and ink-jet head, and ink-jet recorder

A piezoelectric actuatorhas: a piezoelectric actuator partmade up of a common electrode, a piezoelectric element, and an individual electrode; an electrical interconnection joint partformed on the individual electrode; an electrical interconnectionformed on the electrical interconnection joint part; a head blockfixed to a nozzle platethrough the electrical interconnection; and a PI tapedisposed within the head block. A closed spaceis defined between the head blockand the nozzle plate. The closed spaceis divided by the PI tapeinto two sections. Of these two sections of the closed space, the one on the side of the head blockconstitutes a first closed space. A moisture absorbentis sealed within the first closed space. Relative humidity within the closed spaceof the ink jet headis not less than 0% nor more than 20%.

Piezoelectric actuator and method of manufacture therefor, and ink jet head and ink jet type recording device

In a switching apparatus having a pair of electrodes including a first electrode and a third electrode, which are provided with a piezoelectric element therebetween and a pair of electrodes including a second electrode and a fourth electrode, which are provided adjacently to the pair of the first and third electrodes in a state where they are electrically insulated from the first and third electrodes, an electric field in a first direction is generated between the first electrode and the third electrode, and simultaneously an electric field in a second direction is generated between the second electrode and the fourth electrode.

Switching apparatus, electric field applying method and switching system

A ferroelectric element is described which has a structure including a common electrodea ferroelectric filmformed on the common electrodean individual electrodeformed on the ferroelectric filma lead wirefor feeding electric power to the individual electrodewhich is formed on the same plane as of the individual electrodeand a protection filmentirely covering the exposed parts of the ferroelectric filmand the individual electrodeand covering the lead wireThe protection filmis preferably made of a material whose Young's modulus is smaller than that of the ferroelectric filmexactly 1/20 or smaller of the Young's modulus of the ferroelectric filmFurther, the ferroelectric film is formed with the insulation reinforcing film containing at least one of the elements constituting the ferroelectric film.

Ferroelectric element and actuator using the same, and ink jet head and ink jet recording device

A piezoelectric actuatorhas: a piezoelectric actuator partmade up of a common electrodea piezoelectric elementand an individual electrodean electrical interconnection joint partformed on the individual electrodean electrical interconnectionformed on the electrical interconnection joint parta head blockfixed to a nozzle platethrough the electrical interconnectionand a PI tapedisposed within the head blockA closed spaceis defined between the head blockand the nozzle plateThe closed spaceis divided by the PI tapeinto two sections. Of these two sections of the closed spacethe one on the side of the head blockconstitutes a first closed spaceA moisture absorbentis sealed within the first closed spaceRelative humidity within the closed spaceof the ink jet headis not less than 0% nor more than 20%.

A carbon dioxide gas sensor for detecting carbon dioxide gas concentration wherein the carbon dioxide gas detection part consists essentially of a carbonate, a carbonate decomposition catalyst and a semiconductor oxide, particularly preferably BaCO3, CeO.sub.2 and CuO mixed in a specific molar ratio. A process for producing the carbon dioxide detection part of a carbon dioxide gas sensor, wherein the raw-materials in the form of acetic acid salts are uniformly dissolved in a solvent, then dried and ground to produce a ceramic material with a small average particle diameter.

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Kasuga, Japan

Shogo Matsubara