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1. 发明专利

JPH0677552A METHOD FOR POLARIZING BISMUTH LAYERED COMPOUND 失效
公开(公告)号：JPH0677552A
公开(公告)日：1994-03-18
申请号：JP23006892
申请日：1992-08-28
申请人： TOYOTA MOTOR CORP
发明人： KANEKO KAZUHIDE
IPC分类号： C04B35/46 , C04B35/462 , H01L41/18 , H01L41/257 , H01L41/24
摘要： PURPOSE:To enhance the sensitivity to piezoelectricity by a method wherein the title bismuth layered compound is polarized while being impressed with a specific pressure making a right angle with the polarising direction for polarizing the crystalline particles hardly polarized by prior art method. CONSTITUTION:The bismuth layered compound is to be composed of a material having extremely intensitive anisotropy and in specific polarizing direction due to the crystalline structure thereof. Thus, this compound is polarized while being impressed with the pressure exceeding 0.1MPa making a right angle with the polarizing direction. At this time, the grain boundary slip is made in crystalline particles 10 by the pressure in the easily polarizing direction, i.e., the extending direction of a flat surface making a right angle with the pressure impressing direction so that even the crystalline particles 10 hardly polarized by prior art method may be polarized. Accordingly, even if the impressed pressure is relieved to reset to the original state of the crystalline particles 10, the polarized state of respective particles 10 is to be left intact thereby enabling the sensitivity to piezoelectricity to be enhanced compared with the prior art one.

2. 发明专利

JPH04342459A LEAD TITANATE PIEZOELECTRIC CERAMIC MATERIAL 失效
公开(公告)号：JPH04342459A
公开(公告)日：1992-11-27
申请号：JP11153591
申请日：1991-05-16
申请人： TOYOTA MOTOR CORP
发明人： KANEKO KAZUHIDE
IPC分类号： C04B35/46 , C04B35/472 , H01L41/187
摘要： PURPOSE:To provide the subject material having a high Curie temperature, free from the hysteresis of pressure-charge output and having excellent thermal stability by compounding Ti, Pb, etc., to give a prescribed composition. CONSTITUTION:Raw material oxides such as PbO, TiO2, La2O3 and M3O2 are compounded with each other to give a composition of the formula (A is selected from La, Sm, Nd, Sr, and Ca; B is selected from Mn. Ni and Cr; 0.02

3. 发明专利

JPH07133197A PRODUCTION OF HIGHLY ORIENTED BISMUTH TITANATE 失效
公开(公告)号：JPH07133197A
公开(公告)日：1995-05-23
申请号：JP27839093
申请日：1993-11-08
申请人： TOYOTA MOTOR CORP
发明人： KANEKO KAZUHIDE , YOKOISHI SHOJI
IPC分类号： C01G29/00 , C30B7/14 , C30B19/00 , C30B29/22
摘要： PURPOSE:To easily produce highly oriented bismuth titanate. CONSTITUTION:Bismuth alkoxide and titanium alkoxide are simultaneously mixed with alcohol having two or more etheric oxygen atoms or acetylacetone or amino alcohol is further added. The resulting soln. is hydrolyzed and fired.

4. 发明专利

JPH06188476A MANUFACTURE OF BISNUTH LAYER COMPOUND-PIEZOELECTRIC POLYMER COMPOSITE 失效
公开(公告)号：JPH06188476A
公开(公告)日：1994-07-08
申请号：JP33707792
申请日：1992-12-17
申请人： TOYOTA MOTOR CORP
发明人： KANEKO KAZUHIDE
IPC分类号： C08J5/18 , C04B35/46 , H01L41/45 , H01L41/26
摘要： PURPOSE:To enable plastic working and to improve piezoelectric sensitivity by composing a bismuth layer compound. CONSTITUTION:A primary molding formed by mixing a plurality of raw materials at a composition ratio to attain a bismuth layer compound is sintered into a bismuth layer compound, and bismuth layer compound powder formed by pulverizing the bismuth layer compound is mixed with piezoelectric polymer powder to form a secondary molding 1, which is heated under impression of a voltage of 1kV/mm or more. Impression of voltage during heating causes the easy polarization axis of the bismuth layer compound powder and that of the piezoelectric polymer to orientate in a direction of voltage impression, so that sensitivity is improved markedly by synergetic effect.

5. 发明专利

JPH06188470A BISMUTH LAYER COMPOUND-PIEZOELECTRIC POLYMER COMPOSITE 失效
公开(公告)号：JPH06188470A
公开(公告)日：1994-07-08
申请号：JP33706792
申请日：1992-12-17
申请人： TOYOTA MOTOR CORP
发明人： KANEKO KAZUHIDE
IPC分类号： C08J5/00 , C04B35/46 , C08K3/08 , C08K3/22 , C08L27/12 , H01L41/08
摘要： PURPOSE:To make it possible to facilitate plastic work and form piezo-electric elements in various shapes by dispersing bismuth layer compound powder into a piezo-electric polymer matrix comprising a copolymer of vinylidene fluoride and ethylene trifluoride. CONSTITUTION:A piezo-electric polymer, which is a copolymer comprising vinylidene and ethylene trifluoride is used as a matrix where 5 to 90wt.% of bismuth layer compound powder is dispersed into there. It is possible to use ordinary bismuth layer powder, which can be expressed with a general formula (MxBiy) Ti4O15. Since the polymer is used as a matrix, plastic work is available so that various-shaped piezo-electric elements may by formed easily. Furthermore, since the bismuth layer compound powder 2, which is plastic, is dispersed there, it is possible to increase its Young's modulus compared with a polymer simple substance and use the powder as an element, which demands strength, such as a pressure sensor.

6. 发明专利

JPH0677551A METHOD FOR MANUFACTURING BISMUTH LAYERED COMPOUND 失效
公开(公告)号：JPH0677551A
公开(公告)日：1994-03-18
申请号：JP23005192
申请日：1992-08-28
申请人： TOYOTA MOTOR CORP
发明人： KANEKO KAZUHIDE
IPC分类号： C04B35/46 , C04B35/462 , C04B41/80 , H01L41/18 , H01L41/39 , H01L41/24
摘要： PURPOSE:To manufacture a bismuth layered compound having less with time fluctuation in the sensitivity to piezoelectricity even in the application at high temperature and pressure. CONSTITUTION:The bismuth layered compound is characterized by the processing of a polarized sintered body at the temperature exceeding the maximum temperature as well as at the pressure exceeding the maximum pressure under the prospective applicable environment. Accordingly, the change with time in the piezoelectric sensitivity under the prospective applicable environment can be avoided.

7. 发明专利

JPH0648737A BISMUTH LAYER COMPOUND 失效
公开(公告)号：JPH0648737A
公开(公告)日：1994-02-22
申请号：JP20483392
申请日：1992-07-31
申请人： TOYOTA MOTOR CORP
发明人： KANEKO KAZUHIDE
IPC分类号： C01G29/00 , C04B35/00 , C04B35/46 , C04B35/495 , H01L41/187
摘要： PURPOSE:To reduce dispersion of sensitivity of piezoelectric property to temperature in a bismuth layer compound and simultaneously improve the sensitivity. CONSTITUTION:This bismuth layer compound is characterized by including 0.05-0.25wt.% (in terms of MnO) Mn in a compound expressed by the chemical structural formula {M11-yPby)1-2X-M2XBi4+X}Ti4O15 [wherein M1 is alkaline earth metal; M2 is alkali metal; 0.06

8. 发明专利

JPH05139825A PRODUCTION OF LEAD TITANATE BASED PIEZOELECTRIC CERAMIC 失效
公开(公告)号：JPH05139825A
公开(公告)日：1993-06-08
申请号：JP30753191
申请日：1991-11-22
申请人： TOYOTA MOTOR CORP
发明人： KANEKO KAZUHIDE
IPC分类号： C04B35/46 , H01L41/187
摘要： PURPOSE:To improve the output by specifying grain diameter of calcined powder before firing in a lead titanate based piezoelectric ceramic material having a composition expressed by a specific formula. CONSTITUTION:The objective ceramic composition obtained by forming and firing calcined powder having a composition expressed by the formula (Pb1-(3/2)-xAx) (Ti1-yBy) O3 [A is one or more kinds of La, Sm, Nd, Sr and Ca; B is one or more kinds of Mn, Ni and Cr; 0.02 =1mum. By the above-mentioned method, lead titanate based piezoelectric ceramics having high Curie temperature, free from hysteresis in pressure-electron charge output, excellent in temperature stability and free from problem causing lowering of output are obtained.

9. 发明专利

JPS63124586A METHOD FOR CONTROLLING DISPLACEMENT AMOUNT OF PIEZOELECTRIC ELEMENT 失效
公开(公告)号：JPS63124586A
公开(公告)日：1988-05-28
申请号：JP26981586
申请日：1986-11-14
申请人： TOYOTA MOTOR CORP
发明人： KANEKO KAZUHIDE
IPC分类号： H01L41/08
摘要： PURPOSE:To simplify the control of the displacement amount of a piezoelectric element, by simultaneously applying voltages to a pair of first electrodes facing the polarizing direction and a pair of second electrodes facing one direction, which is orthogonal to the polarizing direction, and erasing hysteresis. CONSTITUTION:A voltage is applied to first electrodes 2 facing the thickness direction of a piezoelectric element 1 from a first voltage source 4. Meanwhile, a voltage is applied to second electrodes 3 facing the width direction from a second voltage source 5. Thus the direction of a dipole is controlled. Since the hysteresis peculiar to the piezoelectric element can be erased, the displacement amount of the piezoelectric effect element can be readily controlled, and the desired displacement can be accurately obtained without fail.

10. 发明专利

JPH06116024A PRODUCTION OF BISMUTH LAMINAR COMPOUND 失效
公开(公告)号：JPH06116024A
公开(公告)日：1994-04-26
申请号：JP25995492
申请日：1992-09-29
申请人： TOYOTA MOTOR CORP
发明人： KANEKO KAZUHIDE
IPC分类号： C04B35/46 , C04B35/64 , C04B35/645
摘要： PURPOSE:To enhance the orientation property of easily polarizable axes of a bismuth laminar compd. by a simpler method than hot pressing. CONSTITUTION:A primary compact formed from powdery starting materials mixed in such a compsn. ratio as to give the objective bismuth laminar compd. is preliminarily sintered and pulverized. The resulting temporarily sintered powder is uniaxially pressurized to form a secondary compact and this compact is sintered. Platy crystals grown by the preliminary sintering are crumled by the pulverization and axes easily polarizable are oriented in a direction perpendicular to the direction of the pressurization by the secondary compacting.

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