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1. 发明专利

JPH06139712A INFORMATION RECORDING AND REPRODUCING SYSTEM 失效
公开(公告)号：JPH06139712A
公开(公告)日：1994-05-20
申请号：JP29155992
申请日：1992-10-29
申请人： HITACHI LTD , HITACHI VIDEO & INF SYST
发明人： INUKAI TETSUJI , SAIGO YOICHI , NARITA NORITAKA
IPC分类号： G11B7/00 , G11B7/005 , G11B20/10 , G11B20/12 , G11B20/14 , G11B20/18
摘要： PURPOSE:To reproduce data while using a synchronizing signal at any part excepting for a defect even when there is the defect at one part of synchronizing signals on a medium at the time of normal reproducing, by inspecting the defect at the synchronizing signal part of the recording medium on severe conditions just after data are written. CONSTITUTION:Concerning the recording/reproducing system for recording information corresponding to the front edge and rear edge of a mark and correcting the shift of relative positions between front edge data and rear edge data corresponding to respective synchronizing signals, front edge and rear edge pattern detection circuits 16 and 18 are selected just after data are written, the normality of reproducing synchronizing signals is inspected by a long pattern for synchronizing signal detection, front edge and rear edge pattern detection circuits 17 and 19 are selected at the time of normal reproducing, and the normality of reproducing synchronizing signals is inspected by a short pattern for synchronizing signal detection. Thus, the presence/absence of the defect on the synchronizing signal is severely inspected just after write, and the synchronizing pattern can be properly detected at the time of normal reproducing even when there is any defect at one part of synchronizing signals.

2. 发明专利

JP2003151230A RECORDING AND REPRODUCING DEVICE 审中-公开
公开(公告)号：JP2003151230A
公开(公告)日：2003-05-23
申请号：JP2002241386
申请日：2002-08-22
申请人： HITACHI LTD , HITACHI VIDEO & INF SYST
发明人： SUZUKI HIROSHI , SAIGO YOICHI , SUNADA TAKAHIRO , NARITA YUTAKA
IPC分类号： G11B20/10 , G11B7/005 , G11B7/007 , G11B20/18 , G11B21/10
摘要： PROBLEM TO BE SOLVED: To provide an information recording medium which is of a high density type with a narrow track pitch, and moreover permits to discriminate the track, and to provide a recording and reproducing device using the same. SOLUTION: In an optical disk device, An ID1 detection circuit 59 detects address information contained in a 1st ID part 301 from a reproduced signal, and an ID2 detection circuit 60 address information contained in a 2nd ID part 302 from the reproduced signal. A controller 801 sets address information for identifying a predetermined track to comparator circuits 62, 63, and detects the predetermined track by taking each coincidence between each address information detected and the set and specified address information value.

3. 发明专利

JPH06325372A DATA REPRODUCING DEVICE 失效
公开(公告)号：JPH06325372A
公开(公告)日：1994-11-25
申请号：JP11065093
申请日：1993-05-12
申请人： HITACHI LTD , HITACHI VIDEO & INF SYST
发明人： INUKAI TETSUJI , SAIGO YOICHI , NARITA YUTAKA , YOKOI NOBUHIRO
IPC分类号： G11B7/00 , G11B7/005 , G11B20/14
摘要： PURPOSE:To control the DC level and amplitude of a reproduced signal so as to make them constant when a large difference of a DC level and amplitude exists between a reproduced signal of an ID section and an reproduced signal of a ID section of an optical recording medium or when a sector including a sector in which data is not recorded in a data section is continuously reproduced. CONSTITUTION:Discriminating sections 9 and 10 control a DC compensating section 7 so that DC levels (output of detecting section 8) of an ID section and a data section of a reproduced signal are always made the prescribed value with timing signals 54 and 55 from generating sections 19 and 22 respectively. A discriminating section 14 and 15 control the gain of an AGC section 12 so that amplitude (output of detecting section 13) of the ID section and the data section of the reproduced signal with same timing signals 58 and 59 is always made the prescribed value. When data are not recorded, signals 55, 59 from the generating section 22 are not generated, values in a sector immediately before it for the DC level and the amplitude of the data section are kept.

4. 发明专利

JPS63219216A ELECTRODE CONSTITUTING METHOD FOR SURFACE ACOUSTIC WAVE ELEMENT 失效
公开(公告)号：JPS63219216A
公开(公告)日：1988-09-12
申请号：JP5194687
申请日：1987-03-09
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： TABUCHI TOYOJI , TAKEDA KAZUHIRO , HIKITA MITSUTAKA , SAIGO YOICHI , KUROSAWA KAZUHITO
IPC分类号： H03H3/08
摘要： PURPOSE:To attain the inspection of an element with high accuracy by leading a capacitance measuring electrode from an intermediate connection terminal floated electrically from the input/output terminal, constituting each element in parallel and cutting it in the process of chipping after the measurement. CONSTITUTION:A band rejection filter is constituted by connecting resonators 4-1-4-4 of one opening in plural stages constituting a transducer while employing lost of pairs of interdigital electrodes on a piezoelectric substrate 1. In order to inspect the component of the device comprising plural resonators, lead electrodes 6, 7 for capacitance measurement are provided to the intermediate connection terminal floated electrically when viewed from the input/output terminal and the common terminals 8, 9 are used as the capacitance measuring terminal. Both terminals of all resonators are connected to the terminal 8, 9 in this way, and the capacitance is changed largely even with any resonator short-circuited to off sure component check. After the test, the terminals 8, 9 are cut off in the chipping process to constitute the electrode of the surface acoustic wave element.

5. 发明专利

JPH1050012A INFORMATION RECORDING MEDIUM AND RECORDING AND REPRODUCING DEVICE USING THE SAME 失效
公开(公告)号：JPH1050012A
公开(公告)日：1998-02-20
申请号：JP20052796
申请日：1996-07-30
申请人： HITACHI LTD , HITACHI VIDEO IND INF SYST INC
发明人： SUZUKI HIROSHI , SAIGO YOICHI , SUNADA TAKAHIRO , NARITA YUTAKA
IPC分类号： G11B20/12 , G11B7/00 , G11B7/004 , G11B7/007 , G11B7/085 , G11B7/09 , G11B21/10
摘要： PROBLEM TO BE SOLVED: To discriminate a track in such a high density type as a narrow track pitch by arranging 1st and 2nd ID parts disposed in boundary parts with adjacent tracks into positions where track directions are different from each other. SOLUTION: At the time of reproducing an ID part, an optical disk 10 is irradiated with laser light emitted from a laser light source 57, and its reflected light is received by a photodetector part 58. A regenerative signal 31 of the photodetector part 58 is sent to a demodulation circuit 75, an ID1 detecting circuit 59, an ID2 detecting circuit 60 and a sector mark detecting circuit 61. A sector mark detecting signal 81 is sent to a controller part 801 by the detecting circuit 61. ID1 and ID2 detecting gate signals 77 and 78 are outputted by the control part 801. During a period of an H-level of the signals 77 and 78 respectively, ED1, ID2 number detecting values 68 and 69 are outputted by the ID1, ID2 detecting circuits 59 and 60 respectively. Coincidence of the detecting values 68 and 69 with an ID1 number indicating value 70 and an ID2 number indicating value 71 respectively is taken by comparator circuits 62 and 63 respectively, and ID detection is reported when both signals 79 and 80 of the circuits 62 and 63 are at the H-level.

6. 发明专利

JPH08249831A INFORMATION REPRODUCING DEVICE 失效
公开(公告)号：JPH08249831A
公开(公告)日：1996-09-27
申请号：JP5272295
申请日：1995-03-13
申请人： HITACHI LTD , HITACHI VIDEO IND INF SYST INC
发明人： FUKUDA YASUSHI , SAIGO YOICHI
IPC分类号： G11B20/14 , G11B7/00 , G11B7/005 , G11B27/30
摘要： PURPOSE: To prevent or reduce erroneous synchronization and to improve the reliability of the data by detecting and synchronizing a synchronizing signal and the data of before/after being limited to a kind or plural kinds due to interference between codes with the synchronizing signal. CONSTITUTION: Information is recorded corresponding to a front edge and a rear edge of a mark, and the deviation between relative positions of the front edge data and the rear edge data are corrected by respective synchronizing signals. This device is provided with front edge patterns A, B detection circuits 16, 20 and rear patterns A, B detection circuits 17, 21 altogether detecting the synchronizing signal and the data of before/after being limited to a kind or plural kinds due to the interference between codes with the synchronizing signal. Thus, the erroneous synchronization due to defect, etc., and the data becoming abnormal are prevented.

7. 发明专利

JPH09212869A INFORMATION RECORDING MEDIUM AND ITS RECORDING/ REPRODUCING DEVICE 失效
公开(公告)号：JPH09212869A
公开(公告)日：1997-08-15
申请号：JP1502496
申请日：1996-01-31
申请人： HITACHI LTD , HITACHI VIDEO IND INF SYST INC
发明人： ISHIMARU MAKOTO , SAIGO YOICHI , MIYAMOTO JIICHI , SUGIYAMA HISATAKA , FUKUDA YASUSHI
IPC分类号： G11B7/007
摘要： PROBLEM TO BE SOLVED: To prevent user data from being destroyed when a head is positioned erroneously, by beforehand providing a FLAG part and a periodical pattern for discriminating two adjacent tracks and sharing address information on a medium. SOLUTION: Since a pulse signal exists in the FLAG part 3 of a Tr number 0 groove regenerative signal 112 against that the pulse signal doesn't exits in the FLAG part 3 of a Tr number 0 land regenerative signal 111, both signals can be discriminated. Since the pulse signal doesn't exist in the FLAG part 3 of the Tr number 0 groove regenerative signal 114 against that the pulse signal exists in the FLAG part 3 of the Tr number 0 land regenerative signal 113, both signals can be discriminated. In such a manner, by providing the prepit of the FLAG part on a boundary of a side that a prepit of an ID isn't provided every four tracks summing up land/groove, adjacent land and groove having a common ID can be discriminated.

8. 发明专利

JPS63260228A RADIO TERMINAL EQUIPMENT 失效
公开(公告)号：JPS63260228A
公开(公告)日：1988-10-27
申请号：JP9308687
申请日：1987-04-17
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： HIKITA MITSUTAKA , TAKEDA KAZUHIRO , KUROSAWA KAZUHITO , SAIGO YOICHI
IPC分类号： H04B1/10 , H04B1/3822 , H04B1/40
摘要： PURPOSE:To attain low power consumption and also high performance by controlling at least one of a low noise amplifier of a reception system, a 1st stage mixer and a local oscillator synchronously with the control of transmission power. CONSTITUTION:A transmission system including a transmission oscillator 16, a power amplifier 15, a transmission output monitor coupler 14, an isolator 13 and a power control circuit 18 or the like and a reception system including a reception low noise multiplier 4, a reception post-stage filter 5, a reception 1st stage mixer 6, and an intermediate frequency circuit 7 or the like use one antenna 1 in common via demultiplexers 2, 3. Part of the transmission power is extracted by the coupler 14 in the transmission system as a monitor power, the power control circuit 18 detects the monitor power to control the amplifier 15 so that the detected voltage reaches a prescribed value. Moreover, the control circuit 18 controls the transmission power and controls the output level of the amplifier 4, the mixer 6 and the local oscillator 12 of the reception system.

9. 发明专利

JPS63132515A SURFACE ACOUSTIC WAVE COMPOSITE FILTER 失效
公开(公告)号：JPS63132515A
公开(公告)日：1988-06-04
申请号：JP27864286
申请日：1986-11-25
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： HIKITA MITSUTAKA , SAIGO YOICHI , KUROSAWA KAZUHITO
IPC分类号： H03H9/145 , H03H3/08 , H03H9/02 , H03H9/64
摘要： PURPOSE:To form a composite surface acoustic wave resonator which has the degree of freedom of design by forming a series circuit of plural circuit elements with capacitive elements and one-opening surface acoustic wave resonator between the electrodes of said circuit elements and a common earth. CONSTITUTION:Three capacitors composed of three inter-electrode gaps 3-1-3-3 are connected in series on a single piezoelectric substrate 1 between an input terminal IN and an output terminal OUT and one-opening surface acoustic wave resonators 2-1-2-4 which has said electrodes as common electrodes are connected between the electrodes of said capacitors and the common earth. Thus, a simple matching circuit is introduced outside to cancel the gap capacity at an optional frequency. For the purpose, the capacity values and the constitution of the matching circuit are set to optional values to obtain an optional frequency passing band.

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