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1. 发明专利

JPH08250889A REINFORCED CONCRETE MEMBER FOR ABSORBING RADIO WAVE 失效
公开(公告)号：JPH08250889A
公开(公告)日：1996-09-27
申请号：JP15906595
申请日：1995-06-26
申请人： TAISEI CORP , HITACHI FERRITE LTD
发明人： MIYAZAKI HIROSHI
IPC分类号： E04B1/92 , E04B2/56 , E04C2/06 , E04C5/03 , E04H9/14 , H05K9/00
摘要： PURPOSE: To provide a reinforced concrete member for absorbing radio waves wherein an effect for preventing radio wave reflection can be stably obtained even if concrete has not been sufficiently dried. CONSTITUTION: A reinforced concrete plate 1 is of a double reinforcing structure with two arrays 10, 20 of reinforcing bars placed in a thickness direction. Cores 3 made of a ferrite sintered body are attached to all of lateral bars 12 in the reinforcing bar array 10 placed on a radio wave incident direction A side, so that one each is placed between the adjacent bars 11. The cores 3 absorb radio waves instead of reflecting on the reinforcing bar array 10 on the radio wave incident direction A side, so that incident radio waves and radio waves reflected on the opposite reinforcing bar array 20 offset each other, whereby the reinforced concrete plate 1 in an air dry state absorbs the radio waves. In addition, the thickness for coating the concrete may be a practical value.

2. 发明专利

JPH08139384A METHOD OF MOUNTING CYLINDRICAL PIEZOELECTRIC TRANSFORMER 失效
公开(公告)号：JPH08139384A
公开(公告)日：1996-05-31
申请号：JP30142394
申请日：1994-11-09
申请人： HITACHI FERRITE LTD
发明人： TAMAKAI TOSHIYUKI , YAMAMOTO YOICHI , OKADA MASAHIRO , SADAMURA SHIGERU , SHIMODA YASUO
IPC分类号： H05K1/18 , H01L41/107 , H05K3/30
摘要： PURPOSE: To connect electrodes on the inner surface of a cylindrical piezoelectric transformer to an external circuit easily by a method wherein the knots of vibration are held by support jigs which are fixed to a circuit board or to a board for supporting a piezoelectric transformer device and the outside surface input electrode of the piezoelectric transformer is connected to the external circuit with the metallic support jig. CONSTITUTION: A cylindrical piezoelectric transformer 1 whose input part is provided on one end of a cylindrical piezoelectric unit and whose output part is provided on the other end is fixed to a circuit board 5. At that time, the knots of its vibration are held and fixed by metallic or resin supporting jigs 6 and 7 which are fixed to a circuit board 5 or to a board exclusively for holding the piezoelectric transformer device 1. The metallic supporting jig 7 is also used for connecting an outside surface electrode 2 among input electrodes to an external circuit. Or, a protective case 9 which is made of insulating material and has a cavity in which the cylindrical piezoelectric transformer device 1 is housed is employed and protrusions 10 which is made of insulating material and which support and fix the knots of the vibration of the device are provided on the inner surface of the cavity of the protective case 9.

3. 发明专利

JPH0821813B2 失效
公开(公告)号：JPH0821813B2
公开(公告)日：1996-03-04
申请号：JP29370992
申请日：1992-10-06
申请人： HITACHI FERRITE LTD
发明人： MORYAMA YOSHUKI , OGAWA KYOZO
IPC分类号： E04B1/92 , H01Q17/00 , H05K9/00

4. 发明专利

JPH088613A CONCENTRATED CONSTANT TYPE ISOLATOR AND CIRCULATOR 失效
公开(公告)号：JPH088613A
公开(公告)日：1996-01-12
申请号：JP15800394
申请日：1994-06-15
申请人： HITACHI FERRITE LTD
发明人： YOSHIMOTO MANABU
IPC分类号： H01P1/383 , H01P1/36
摘要： PURPOSE:To provide a concentrated constant type isolator and circulator of 1GHz or more which have stable characteristics and small sized constitution by applying a 4-terminal structure to two center conductors and a 2-terminal structure to another center conductor respectively. CONSTITUTION:Three center conductors 2-4 are radially projecting out of a circular shielding plate 1, and a garnet is arranged on the plate 1. Then the conductors 2-4 are folded and insulated from each other on the garnet so that a center conductor part is formed. The conductors 2 and 3 apply the 4-terminal structures, and the conductor 4 applies a 2-terminal structure. The conductors 2 and 3 can use 4 or more terminals and the space between these conductors are defined at an angle (a) that may be set at 70 deg. or preferably 60 deg. or less and more preferably at 55 deg. or less.

5. 发明专利

JPH07307212A NI FERRITE SINTERED BODY AND POWER SOURCE CORE 失效
公开(公告)号：JPH07307212A
公开(公告)日：1995-11-21
申请号：JP7997795
申请日：1995-03-10
申请人： HITACHI FERRITE LTD
发明人： UEDA HITOSHI , KOYUHARA TOKUKAZU , UCHIKAWA TERUO
IPC分类号： C01G49/00 , C04B35/28 , C04B35/30 , H01F1/34
摘要： PURPOSE:To provide a high resistivity Ni ferrite which allows a small core loss and can be used in a transformer for a switching power source, etc. CONSTITUTION:The major component of an Ni ferrite sintered body is composed of 48.0-50.0mol% of Fe2O3, 14.0-24.0mol% of NiO and 28.0-36.0mol% of ZnO with a minimum core loss of 30kW/m or less (50kHz, 50mT).

6. 发明专利

JPH07257967A NI-CONTAINING LOW LOSS FERRITE FOR POWER SOURCE 失效
公开(公告)号：JPH07257967A
公开(公告)日：1995-10-09
申请号：JP7249994
申请日：1994-03-16
申请人： HITACHI FERRITE LTD
发明人： NAKAGAWA EMI , UEDA HITOSHI , UCHIKAWA TERUO
IPC分类号： C01G49/00 , C04B35/30 , H01F1/34
摘要： PURPOSE:To reduce the core loss and increase the resistivity by specifying the P content of a sintered compact contg. Fe2O3, NiO and ZnO. CONSTITUTION:A mixture of 40-52.5mol% Fe2O3 having

7. 发明专利

JPH07130565A METHOD OF BURNING FERRITE CORE 失效
公开(公告)号：JPH07130565A
公开(公告)日：1995-05-19
申请号：JP30355993
申请日：1993-11-08
申请人： HITACHI FERRITE LTD
发明人： NISHIO TSUTOMU , TADA HIDEYUKI
IPC分类号： H01F41/02
摘要： PURPOSE:To provide a ferrite core burning method wherein a ferrite core possessed of a flat surface and a curved surface adjoining to it can be burned high in dimensional accuracy. CONSTITUTION:A burning jig 6 is possessed of a plane tilted by an angle of 10 to 30 deg., a stopper provided at the lower end of the tilted plane, and a curved surface adjoining to the higher end of the tilted plane, and a molded body 5 of a ferrite core with a flat surface and an adjoining curved surface is placed on the tilted plane of the burning jig 6 making its flat surface confront the tilted plane, positioned by the stopper, and burned.

8. 发明专利

JPH0774575A TRANSFORMER TYPE STACK DISTRIBUTOR 失效
公开(公告)号：JPH0774575A
公开(公告)日：1995-03-17
申请号：JP24046993
申请日：1993-08-31
申请人： HITACHI FERRITE LTD
发明人： TAKEDA TSUYOSHI , ISHIDA TORU , KISHIMOTO YASUSHI
IPC分类号： H03H7/48 , H01P5/12
摘要： PURPOSE:To reduce a distribution loss and to perform extreme miniaturization by forming the total length of strip line electrodes to a length for obtaining inductance to be a specific impedance value, pulling out an intermediate tap and forming both ends of the electrode and the pull-out electrode of the intermediate tap on the side face of a stacked body. CONSTITUTION:The stacked external electrodes 2b-8b, 2c-8c and 2d-8d respectively form the external electrodes B, C and D. For strip electrode substrates 2-7, the strip line electrodes 2e-7e are respectively formed on one surface on a dielectric substrate and the respective strip line electrodes are connected by through- holes 3g, 4g, 6g and 7g. The total length of the strip line electrodes 2e-4e and the total length of the strip line electrodes 5e-7e are respectively the length provided with the inductance L to be L=50/omega (omega: angular frequency.) Thus, a frequency is as prescribed and omegaL=100OMEGA is attained between the electrodes B and C and this transformer type stack distributor is obtained.

9. 发明专利

JPH0774496A RADIO-WAVE ABSORBING PANEL 失效
公开(公告)号：JPH0774496A
公开(公告)日：1995-03-17
申请号：JP24047193
申请日：1993-08-31
申请人： HITACHI FERRITE LTD
发明人： MORIYAMA YOSHIYUKI , TANAKA TOSHIHIKO
IPC分类号： E04B1/92 , H01Q17/00 , H05K9/00
摘要： PURPOSE:To provide a light radio-wave absorbing panel in structure suitable even for a complex surface configuration, by inserting tube-shaped ferrite bodies between reinforcing bars at least partly. CONSTITUTION:A radio-wave absorbing panel has a plane part with a length (f) of 800mm and a circumference part with a length (e) of 1600mm, and a length (g) is 150mm and a height (h) is 200mm. At a plane part, plane ferrite plates 1 are arranged continuously in a magnetic field direction, while the ferrite plates 1 are arranged intermittently with a gap ratio of 70% in an electric field direction. At a circumference part has tube-shaped ferrite bodies 3 each with an outer diameter of 25mm, inner diameter of 6.1mm, and length of 40mm are inserted between reinforcing bars 2 in the electric field direction. Consequently, a lightweight radio-wave absorbing panel suitable even for a complex surface structure can be formed, and stable radio-wave absorbing characteristics are ensured irrespective of changes in angles of incidence of the radio wave.

10. 发明专利

JPH0774495A RADIO-WAVE ABSORPTIVE PANEL 失效
公开(公告)号：JPH0774495A
公开(公告)日：1995-03-17
申请号：JP24047093
申请日：1993-08-31
申请人： HITACHI FERRITE LTD
发明人： MORIYAMA YOSHIYUKI , TANAKA TOSHIHIKO
IPC分类号： E04B1/92 , H01Q17/00 , H05K9/00
摘要： PURPOSE:To provide a radio-wave absorptive panel with excellent wide-band attenuation in reflection, by putting a composite material with magnetic powder on an outer face of an exterior PC panel, where tube-shaped ferrite bodies are inserted between reinforcing bars. CONSTITUTION:Reinforcing bars 1 are put in a meshed configuration with a length (a) of 100mm by a length (b) of 75mm and each cross point is welded. The reinforcing bar 1 elongated in a field direction is covered with a tube- shaped body 3 at each meshed square part. An absorptive tile 4 made of 10wt.% cement mixed with 90wt.% magnetic powder is put on the outside face. The magnetic powder is sintered powder of Mg-Mn-Cu-Zn-based ferrite. Since the radio-wave absorbing panel in a TV frequency band can be composed by using wave absorbing tiles made of cement mixed with the magnetic powder and by inserting the tube-shaped ferrite bodies between the reinforcing bars as a radio reflecting plate, the radio-wave absorption can be improved.

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