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1. 发明专利

JPH11219524A LASER DRIVING DEVICE AND OPTICAL DISK RECORDING DEVICE USING THE SAME 失效
公开(公告)号：JPH11219524A
公开(公告)日：1999-08-10
申请号：JP2063498
申请日：1998-02-02
申请人： HITACHI LTD
发明人： KUREBAYASHI MASAAKI , TANAKA YASUTO , ASADA AKIHIRO , ONUKI HIDEO , KAKU TOSHIMITSU
IPC分类号： G11B7/00 , G11B7/0045 , G11B7/125
摘要： PROBLEM TO BE SOLVED: To enhance the control performance of a mark and the quality of a signal by transmitting the switching signal of a laser while coding it, converting the coded signal into the switching signal with a decoder and switching a laser control current while synchronizing the current with the signal in a synchronizing circuit to eliminate an interline interference with a few transmission lines. SOLUTION: An encoder 12 converts a recording signal 16 having a prescrived waveform into control codes having an (x) values satisfying 2n

2. 发明专利

JPH1022765A SURFACE ACOUSTIC WAVE RESONATOR AND RESONATOR TYPE FILTER 失效
公开(公告)号：JPH1022765A
公开(公告)日：1998-01-23
申请号：JP17769196
申请日：1996-07-08
申请人： HITACHI LTD
发明人： WATANABE KAZUSHI , HOSAKA NORIO , ONUKI HIDEO
IPC分类号： H03H9/145 , H03H9/25
摘要： PROBLEM TO BE SOLVED: To suppress spuriousness by the difference of surface wave acoustic velocity by forming a dielectric film comprising a specified material and a specified film thickness at the non-crossing opening part of comb-line electrodes. SOLUTION: The comb-line electrodes 3 of the film thickness 100nm by the sputtering of Al-Ti alloy are formed for 300 lines by a pair number on a piezoelectric substrate 1 composed of LiNbO3 or the like and this SAW resonator is constituted. Reflectors 5 are formed on both sides of the comb-line electrodes 3. The part of a bus bar 4 for electrically connecting the comb-line electrodes 3 and a bonding pad 2 for wiring is thickened to 600nm by pure Al, the reliability of wire bonding is improved and the resistance portion of an electrode pattern is lowered. The opening length of a crossing part where the comb-line electrodes 3 of the SAW resonator are crossed with each other is 60μm and the non-crossing opening part where they are not crossed is generated for 5μm. The dielectric film 6 of the film thickness 700nm by the sputtering of silicon dioxide is formed at the part over the non-crossing opening part and the bus bar 4. The surface wave acoustic velocity of the non-crossing part is matched with the one of the crossing part.

3. 发明专利

JPH0923133A SURFACE ACOUSTIC WAVE FILTER, BRANCHING FILTER AND MOBILE RADIO EQUIPMENT 失效
公开(公告)号：JPH0923133A
公开(公告)日：1997-01-21
申请号：JP16952095
申请日：1995-07-05
申请人： HITACHI LTD
发明人： ONUKI HIDEO , HOSAKA NORIO , WATANABE KAZUSHI
IPC分类号： H03H9/64 , H04B1/58
摘要： PROBLEM TO BE SOLVED: To attain a surface acoustic wave(SAW) filter and a branching filter optimum to a compact and high performance mobile radio equipment capable of reducing chip size and reducing performance deterioration by wiring because the wiring is easy. SOLUTION: Braking capacitance values are successively reduced in the order of a parallel SAW resonator 2, a parallel SAW resonator 5, a series SAW resonator 3, and a series SAW resonator 4. Surface acoustic wave(SAW) resonators each of which consists of two or three stages of comb electrodes electrically connected in series on a linearly continued acoustic propagation path are used at least for the resonators 3, 4. The acoustic propagation paths of the resonators 2 to 5 are arranged on a piezo-electric substrate 1 in parallel in the order of resonators 2, 3, 4, and 5.

4. 发明专利

JPH0846476A SURFACE ACOUSTIC WAVE DEVICE AND ANTENNA DETECTION DEVICE USING THE SAME 失效
公开(公告)号：JPH0846476A
公开(公告)日：1996-02-16
申请号：JP17435694
申请日：1994-07-26
申请人： HITACHI LTD
发明人： HOSAKA NORIO , ONUKI HIDEO , WATANABE KAZUSHI , YUHARA AKITSUNA
IPC分类号： H03H9/145 , H03H9/25
摘要： PURPOSE:To improve the performance and to make the device compact by wiring a wire attaching to the element substrate and locating the other ones at the highest position or at the lower position. CONSTITUTION:The part of a wiring 9 which passes on bases 2 and 5 is attached to the bases 2 and 5. The part of the other wiring 9 (the part of the wiring 9 between surface acoustic wave resonance unit 1 and an inductance element 4 and the part of the wiring 9 between the surface acoustic wave resonance 1, inductance element 4, and a terminal 10 of a package 7) is arranged not to be located higher than the part attached to the base 2 and 5. Thus, the wire 9 can be prevented from coming too close to a lid 11 as in the loop- shaped wiring. Thus, the parastic capacitance between the wiring 9 and the lid 11 can be reduced enough to prevent the deterioration of the impedance characteristic.

5. 发明专利

JPH07263995A SURFACE ACOUSTIC WAVE DEVICE AND ANTENNA BRANCHING FILTER USING THE SAME 失效
公开(公告)号：JPH07263995A
公开(公告)日：1995-10-13
申请号：JP5052894
申请日：1994-03-22
申请人： HITACHI LTD
发明人： HOSAKA NORIO , ONUKI HIDEO , WATANABE KAZUSHI , YUHARA AKITSUNA
IPC分类号： H01P1/213 , H03H9/05 , H03H9/145 , H03H9/25 , H03H9/64
摘要： PURPOSE:To provide satisfactory frequency characteristics in a high frequency area by practically suppressing the dielectric constant of a dielectric substrate less than '6' at an inductance element composed of a microstrip line formed on the dielectric substrate. CONSTITUTION:A surface acoustic wave (SAW) resonator 1 is constituted as a one-opening SAW resonator by forming many pairs of interdigital electrodes 3 with A2 thin films or the like on the surface of a piezoelectric substrate 2. An inductance element 4 forms a microstrip line 6 composed of a copper thin film on a quartz glass board 5. This SAW resonator and the inductance element are fixed in the same package 7 by an adhesive agent and connected each other or with a terminal 9 of the package by a wire 8 of Al or the like. Then, quartz glass is used for the substrate, and the dielectric constant is low like '3.8', for example. Therefore, the inductance of stray capacity is less affected, the amount of attenuation in the high frequency area is improved, and sharp frequency characteristics can be provided as well.

6. 发明专利

JPH03278605A SURFACE ACOUSTIC WAVE DEVICE AND MANUFACTURE THEREOF 失效
公开(公告)号：JPH03278605A
公开(公告)日：1991-12-10
申请号：JP7685890
申请日：1990-03-28
申请人： HITACHI LTD
发明人： HOSAKA NORIO , WATANABE KAZUSHI , ONUKI HIDEO , YUHARA AKITSUNA
IPC分类号： H03H3/08 , H03H9/145
摘要： PURPOSE:To reduce dispersion in the product characteristic even when the frequency is high and the size of electrode of the surface acoustic wave element is small by providing an electrode finger separate pattern made of an insulation film between electrode fingers of interdigital electrodes. CONSTITUTION:Aluminum thin film formed by the sputtering method is employed for input output interdigital electrodes 2, 3 and an inter-electrode finger pattern 4 of each interdigital electrode is made of a silicon oxide thin film by using the sputtering method. In this case, the film thickness of the interdigital electrodes 2, 3 and the film thickness of the inter-electrode finger pattern 4 are formed the same, Thus, a difference from an acoustic impedance resulting from the difference from a mass addition effect depending on the electrode finger is reduced and ruggedness of the surface in terms of geographical structure is relaxed. Thus, the perturbation or reflection of a surface acoustic wave in the electrode of the high frequency surface acoustic wave device is prevented and the performance of the device is improved by ripple reduction or the like.

7. 发明专利

JPH03205907A MULTI-ELECTRODE TYPE SURFACE ACOUSTIC WAVE DEVICE 失效
公开(公告)号：JPH03205907A
公开(公告)日：1991-09-09
申请号：JP64590
申请日：1990-01-08
申请人： HITACHI LTD
发明人： WATANABE KAZUSHI , HOSAKA NORIO , YUHARA AKIAMI , ONUKI HIDEO , YAMADA JUN
IPC分类号： H03H9/25 , H03H9/64
摘要： PURPOSE:To obtain a satisfactory characteristic being excellent in an out-band suppression degree by providing the device with a grounding electrode pattern being formed separately in a closing mode between each input electrode and each output electrode. CONSTITUTION:On a piezoelectric substrate 1, an input electrode 2 and an output electrode 3 are placed alternately, and the input electrode 2 and the output electrode 3 are connected to an input electrode connecting pad 4 and an output electrode connecting pad 5, respectively, and connected to an input stem lead pin 6 and an output stem lead pin 7 by a wire 8, respectively. Also, in a closing mode between each input electrode 2 and each output electrode 3, a grounding common electrode pattern 12 is formed separately from them, and it is grounded to the metallic stem surface 11. In such a way, a mutual induction action by a leakage magnetic field between the input and the output electrodes, and an induction action by the capacity coupling are reduced, therefore, the influence of a direct wave drops, and the out-band suppression degree of a frequency characteristic is improved.

8. 发明专利

JPH02113616A ELASTIC WAVE FILTER AND ANTENNA DEMULTIPLEXER USING IT 失效
公开(公告)号：JPH02113616A
公开(公告)日：1990-04-25
申请号：JP26603488
申请日：1988-10-24
申请人： HITACHI LTD
发明人： HOSAKA NORIO , SHIBA TAKASHI , TAKEMA TAKEMITSU , YAMADA JUN , ONUKI HIDEO
IPC分类号： H03H9/17 , H03H3/08 , H03H9/56 , H03H9/72 , H03H9/74
摘要： PURPOSE:To prevent the leakage of energy by providing an oscillation position composed of an insulator film, a lower part electrode, a piezoelectric body film and an upper part electrode on the surface of a substrate, and removing the edge part of the piezoelectric body film by matching to an upper part electrode edge in the direction perpendicular to the propagation direction of the elastic wave. CONSTITUTION:By matching to an electrode edge at both edges perpendicular to the propagation direction of the elastic wave of an upper part electrode 5, a piezoelectric body film 4 is constructed to be etching-removed. Namely, an electric signal impressed to an electrode 5 formed to the surface generates the electric field at the section of a lower part electrode 3, the elastic wave is excited by the piezoelectric effect of the piezoelectric body film 4, becomes a propagation mode, the oscillating part composed of a thin film construction is propagated, the oscillating part is formed in a geometric shape, and therefore, the elastic wave is reflected on the thin film edge surface. Thus, the leakage of the energy between the oscillation part and the supporting substrate can be reduced and the loss of the filter can be decreased.

9. 发明专利

JPH0235422A OPTICAL MODULATING AND SCANNING DEVICE AND OPTICAL HEAD UTILIZING THE SAME DEVICE 失效
公开(公告)号：JPH0235422A
公开(公告)日：1990-02-06
申请号：JP18454288
申请日：1988-07-26
申请人： HITACHI LTD
发明人： ONUKI HIDEO , YOSHIDA TAKAHIKO , KISHIMOTO SEIJI
IPC分类号： G02B6/12 , G02F1/295 , G02F1/335 , G11B7/125
摘要： PURPOSE:To eliminate the fluctuation in wavelength and to alow completely separate modulation and scanning by forming an optical modulator which modulates laser light according to propagation directions and an optical scanner which shifts the propagation direction on the same waveguide. CONSTITUTION:The optical modulator 5 makes on-off modulation according to whether the propagation of the laser light of a laser light source 2 is changed or not. The light changed in the direction is discarded. The optical scanner 6 makes scanning by shifting the propagation direction of said light by an arbitrary desired quantity from a certain specified direction. The modulator 5 and scanner 6 are formed on the same waveguide. The laser light is made into guided light by an incident coupler 3 and is emitted from an exit coupler 7 via the modulator 5 and the scanner 6. Since the optical modulator 5 does not turn the laser driving on and off, the fluctuation in the wavelength is obviated and the guided light is emitted at the angle exacter than the angle of a diffraction grating. The separate execution of the modulation and scanning is thus possible.

10. 发明专利

JPH01263603A GRATING COUPLER 失效
公开(公告)号：JPH01263603A
公开(公告)日：1989-10-20
申请号：JP9133988
申请日：1988-04-15
申请人： HITACHI LTD
发明人： YOSHIDA TAKAHIKO , ONUKI HIDEO , KISHIMOTO SEIJI
IPC分类号： G02B6/122 , G02B6/12 , G11B7/135
摘要： PURPOSE:To provide the high-performance grating coupler for a waveguide type optical device by providing a 1st grating structure part which radiates the luminous flux in a light guide into a dielectric film and the 2nd grating structure part which emits the luminous flux in the dielectric film into an external space. CONSTITUTION:The dielectric film 3 having the refractive index smaller than the refractive index of the light guide 2 is laminated on the surface of the Ti-diffused light guide 2 formed on an LiNbO3 substrate 1. The luminous flux 6 guided in the light guide 2 is emitted into the dielectric film 3 at an exit angle theta by the 1st grating structure 4 to provide the luminous flux 7 which is further emitted by the 2nd grating structure 5 into the external space of the dielectric film 3 at an exit angle psi to provide the luminous flux 8. The pitch A1 of the grating structure 4 is then taken large and the accuracy at the time of production of the grating structures is improved; therefore, the grating coupler having the higher performance is obtd.

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