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51. 发明专利

JPH0212882A LAYER-BUILT DISPLACEMENT ELEMENT 失效
公开(公告)号：JPH0212882A
公开(公告)日：1990-01-17
申请号：JP16299688
申请日：1988-06-30
申请人： HITACHI METALS LTD
发明人： WATANABE JUNICHI , SADAMURA SHIGERU
IPC分类号： H01L41/083 , H01L41/08 , H01L41/09 , H02N2/00
摘要： PURPOSE:To obtain a layer-built displacement element having external electrodes with high bond strength and capable of preventing migration completely by forming internal electrodes of a non-silver material and forming the external electrodes by stacking a layer consisting of at least one of Pd and Pt and grass frit and a layer consisting of at least one of Ni and Cu. CONSTITUTION:A plurality of sheets 1 of an electromechanical converting material and internal electrodes 2 of a conductive metallic material are stacked alternately, and a pair of external electrodes 3 are provided on the sides of the layer-built body so that they are connected with alternate layers of the internal electrodes 2. In a layer-built displacement element thus constructed, the internal electrodes 2 are formed of a non-silver material while the external electrodes 3 are formed by stacking a layer consisting of at least one of Pd and Pt and glass frit and a layer consisting of at least one of Ni and Cu. According to an embodiment, palladium paste for forming the internal electrodes 2 is screen printed on the surface of each green sheet and the printed sheets are stacked and baked. Then, the external electrodes 3 are provided as described in the above.

52. 发明专利

JPH01270499A ULTRASONIC ELEMENT 失效
公开(公告)号：JPH01270499A
公开(公告)日：1989-10-27
申请号：JP9973888
申请日：1988-04-22
申请人： HITACHI METALS LTD
发明人： SADAMURA SHIGERU , ABE NOBORU , KUNIMI TSUNEO
IPC分类号： H04R17/00
摘要： PURPOSE:To drastically enhance sensitivity by forming independent transmitting part and a receiving part on a diaphragm, and preventing the effect of a reverberant signal generated according to transmission from being exercised on the receiving part. CONSTITUTION:A common electrode 12 is provided on one side of a diaphragm 11 consisting of piezoelectric materials. A transmitting electrode 13 and a receiving electrode 14 are provided on the other side. The respective independent transmitting part and receiving part are formed by the electrodes 13 and 14. Thus, the effect of the reverberant signal on the receiving part due to the transmission is prevented, and the sensitivity is greatly enhanced.

53. 发明专利

JPS6483176A ULTRASONIC VIBRATOR 失效
公开(公告)号：JPS6483176A
公开(公告)日：1989-03-28
申请号：JP24050287
申请日：1987-09-25
申请人： HITACHI METALS LTD
发明人： SADAMURA SHIGERU
IPC分类号： G01S7/521 , G01S7/52 , H04R17/00
摘要： PURPOSE:To obtain an ultrasonic vibrator having a high noise resistance and to enable the implementation of detection of a wide range and transmission to a more distant place, by a method wherein vibrations in the direction of the axis of the vibrator are divided by discontinuous planes. CONSTITUTION:An ultrasonic vibrator is formed of an electro-mechanical conversion material so that it has the shape of a hollow cylinder having a mean radius (r) and a length L. Discontinuous planes 31 are provided so that they intersect the axis of the vibrator 3 perpendicularly, and a distance l1 between the discontinuous planes 31 or a distance l2 between the discontinuous plane 31 and the end of face of the vibrator 3 is set at the dimension of 0.7pir(1-sigma ) (sigma is the Poisson ratio of a voltage material). Besides, a continuous part 32 is provided in a part of the discontinuous plane 31 so that a prescribed length in the direction of the axis of the vibrator 3 is secured. Electrodes are provided on the inner and outer surfaces of the vibrator 3, lead wires are connected thereto, and a high-frequency voltage is impressed thereon. Then vibrations in the direction of the axis are divided by the discontinuous panes 31 and not propagated to the whole of the vibrator 3. Therefore, ultrasonic waves emitted outward are almost composed of components in the radial direction thereby causing no coupling phenomenon.

54. 发明专利

JPS63270320A PRODUCTION OF PIEZOELECTRIC PORCELAIN 失效
公开(公告)号：JPS63270320A
公开(公告)日：1988-11-08
申请号：JP10529487
申请日：1987-04-28
申请人： HITACHI METALS LTD
发明人： WATANABE JUNICHI , SADAMURA SHIGERU
IPC分类号： C04B35/49 , C01G25/00 , H01B3/00 , H01L41/18 , H01L41/187
摘要： PURPOSE:To uniformly disperse aluminum and to contrive to prevent mechanical strength after sintering, by adding aluminum as a specific aluminum alkoxide soluble in an organic solvent to other raw material powder to give a mixed dispersion and hydrolyzing the aluminum alkoxide. CONSTITUTION:100pts.wt. raw material powder such as lead oxide, zirconium oxide and titanium oxide of main raw materials constituting lead zirconate titanate is blended by a ball mill, slurry thereof is dried, falsely pressed, calcined and ground by balls and a pot. Then the ground raw material powder is mixed with 0.01-1.0pt.wt. calculated as Al2O3 of aluminum alkoxide in an organic solvent. Then the mixture is incorporated with water, the aluminum alkoxide is hydrolyzed to give raw material powder. Consequently, the raw material powder uniformly mixed with aluminum is obtained and variability of mechanical strength is prevented since Al2O3 is precipitated on crystal grain boundary.

55. 发明专利

JPS6377746A LIQUID INJECTOR 失效
公开(公告)号：JPS6377746A
公开(公告)日：1988-04-07
申请号：JP22149886
申请日：1986-09-19
申请人： HITACHI METALS LTD
发明人： WATANABE JUNICHI , SADAMURA SHIGERU
IPC分类号： H01L41/08 , B41J2/015 , B41J2/045 , B41J2/055 , B41J2/14
摘要： PURPOSE:To obtain a liquid injector which has an extremely excellent driving characteristic or injection efficiency by setting the ratio of the effective deformation length l to the entire length L of a piezoelectric ceramic tube to l/L>=0.75. CONSTITUTION:The ratio of the effective deformation length l to the entire length L of a piezoelectric ceramic tube 1 is set to l/L>=0.75. As apparent from a graph showing the variation of an electromechanical coupling coefficient K' 31 of a radial direction when the ratio of the length l to the entire length L is altered, the coefficient K' 31 exhibits 0.5 or more in a range over 0.75 of the ratio, but the K' 31 is largely reduced in a range less than 0.75 of the ratio. Accordingly, since the K' 31 of the coefficient representing the electromechanical conversion performance in the radial direction of the tube 1 can be set to a high value, the driving characteristic or the injection efficiency can be improved.

56. 发明专利

JPS62243964A PIEZO-ELECTRIC DRIVEN FUEL INJECTOR 失效
公开(公告)号：JPS62243964A
公开(公告)日：1987-10-24
申请号：JP8715486
申请日：1986-04-17
申请人： HITACHI METALS LTD
发明人： ISHII TOSHIO , SADAMURA SHIGERU , WATABE YOSHIYUKI
IPC分类号： H01L41/09 , F02M51/06 , F02M61/16 , H02N2/00
摘要： PURPOSE:To form a fuel injector in a small size usable even in a high temperature with a quick response speed further with large driving power, by driving a valve unit by a piezo-electric element consisting of piezo-electric laminated material, in case of the fuel injector which injects grain drip of liquid for fuel. CONSTITUTION:A fuel injector 1 is constituted of a needle 2, piezo-electric driving element 3 and a filter 8. Fuel, which passes through the filter 8 from an inlet port 7 and through a clearance between the needle 2 and a valve seat 5 via flow paths 16, 4, is injected from a jet 9. The piezo-electric driving element is constituted of a piezo-electric laminated material 10 and a diaphragm plate 11 in a piezo-electric driving element case 13. In this way, a fuel injector of small size usable even in a high temperature with a quick response speed further with large driving power can be presented.

57. 发明专利

JPS62211974A LAMINATED PIEZOELECTRIC ELEMENT AND MANUFACTURE THEREOF 失效
公开(公告)号：JPS62211974A
公开(公告)日：1987-09-17
申请号：JP5423986
申请日：1986-03-12
申请人： HITACHI METALS LTD , S C DENSHI KK
发明人： HIRANUMA KATSUO , SAKAMOTO MASAMI , KURIHARA KOICHIRO , SADAMURA SHIGERU
IPC分类号： H01L41/083 , H01L41/09
摘要： PURPOSE:To obtain sufficient dielectric strength and sufficient displacement even when driven by a low voltage by a method wherein a pair of external electrodes and an internal electrode are each electrically connected every second layer with the side surface of a laminated body constituted by laminating plural sheets of piezoelectric ceramic thin plates. CONSTITUTION:A binder, an organic solvent and so on are added to and mixed with raw powder, which is for piezoelectric ceramic thin plates and is blended in the desired composition, and after this material is formed in a sheet style, the piezoelectric ceramic thin plates with internal electrodes 2 formed thereon are stacked on the surface, plural sheets are sintered, and a laminated body is formed. After an insulating layer 3 is formed on the side surface of the laminated body, a pair of external electrodes 4 and numerous lead parts 5 are formed on the insulating layer 3 in such a way that the internal electrodes are respectively electrically connected with the above external electrodes alternately and every second layer.

58. 发明专利

JPS62200778A LAMINATED PIEZOELECTRIC ELEMENT 失效
公开(公告)号：JPS62200778A
公开(公告)日：1987-09-04
申请号：JP4296786
申请日：1986-02-28
申请人： HITACHI METALS LTD
发明人： SADAMURA SHIGERU , KURIHARA KOICHIRO
IPC分类号： H01L41/083
摘要： PURPOSE:To enable a piezoelectric sheet to be displaced effectively in its approximately entire surface and to enable external electrodes to be formed easily even if piezoelectric sheets are thin, by providing each of the piezoelectric sheet switch a pair of projections so that internal electrode plates are led out alternately to the side faces of said projections. CONSTITUTION:A plurality of thin piezoelectric sheets 1 are superposed on each other with interposition of internal electrode plates 2 having a generally identical shape with that of the piezoelectric sheets to form a laminate. A pair of external electrodes 3 are provided on the side faces of the laminate, such that they are connected to the internal electrode plates 2 on alternate layers. In such a laminate-type piezoelectric element, each of the thin piezoelectric sheets 1 has a pair of projections 1a projecting outwards and the internal electrode plates 2 located between the piezoelectric sheets 1 are led out alternately to opposite external side faces of said projections 1a. Conductors are disposed on the end face of the projections to provide a pair of external electrodes connected to the internal electrode plates 2 on a alternate layers. Said internal electrode plates 2 may be formed integrally with the thin piezoelectric sheets 1 for example by screen printing silver-palladium paste on the thin piezoelectric sheets 1.

59. 发明专利

JPS62190783A LAMINATING TYPE PIEZOELECTRIC ELEMENT 失效
公开(公告)号：JPS62190783A
公开(公告)日：1987-08-20
申请号：JP3247086
申请日：1986-02-17
申请人： HITACHI METALS LTD
发明人： KURIHARA KOICHIRO , SADAMURA SHIGERU , YAMADA YASUO
IPC分类号： H01L41/083
摘要： PURPOSE:To dissipate heat generation on drive even from a through-hole, and to prevent the deterioration of performance by forming a through-hole in the direction vertical to the plane of a piezoelectric body to a laminating type piezoelectric element. CONSTITUTION:A through-hole 4 in the direction vertical to the plane of a piezoelectric body 1 is shaped to a laminating type piezoelectric element. One through-hole may be formed at the center or a plurality of small through-holes 4' may be shaped as the through-hole 4. The through-hole 4 has a function which dissipates heat from the center when the laminating type piezoelectric element is driven and heat is generated while the de-binding process of the laminating type piezoelectric element is also conducted from the through-hole 4 at the time of heating in a de-binding process on manufacture, thus preventing trouble such as cracks.

60. 发明专利

JPS62133777A LAMINATION-TYPE PIEZOELECTRIC ELEMENT AND MANUFACTURE THEREOF 失效
公开(公告)号：JPS62133777A
公开(公告)日：1987-06-16
申请号：JP27420785
申请日：1985-12-05
申请人： HITACHI METALS LTD
发明人： KURIHARA KOICHIRO , SADAMURA SHIGERU
IPC分类号： H01L41/083
摘要： PURPOSE:To reduce the space for wiring at mounting by leading out both of two external electrodes of a lamination-type piezoelectric element from only one side plane of said element. CONSTITUTION:A calcined powder of a piezoelectric material mainly consisting of Pb(Zr,Ti)O3 mixed with a minute quantity of organic binder is dispersed in an organic solvent to prepare a slurry. This slurry is spread to a predetermined thickness by doctor blade technique to make a piezoelectric material 1 of thin plate form. Next, a platinum paste is screen-printed on the surface of one side of that piezoelectric material 1 to form an internal electrode 2. A predetermined number of such piezoelectric materials 1 in which the internal electrode 2 has been formed are laminated and made into one body by heat pressing, after which it is sintered at a temperature of about 1,250 deg.C to obtain a piezoelectric element composed of the piezoelectric materials 1 and the internal electrodes 2 laminated alternately. On only one side plane of the element, wires 3 and 4 are respectively soldered to every two internal electrodes 2 alternately to fabricate a lamination-type piezoelectric element having a pair of external electrodes A and B.

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