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91. 发明专利

JP2002304821A DIGITAL SIGNAL GENERATING METHOD, AND INFORMATION RECORDING MEDIUM FOR RECORDING IT, REPRODUCTION METHOD 失效
公开(公告)号：JP2002304821A
公开(公告)日：2002-10-18
申请号：JP2001107931
申请日：2001-04-06
申请人： HITACHI LTD
发明人： HIRAYAMA HIROSHI
IPC分类号： H04N5/92 , G11B7/007 , G11B20/12 , G11B20/14 , G11B20/18 , H03M7/30 , H04L7/08
摘要： PROBLEM TO BE SOLVED: To provide a digital signal generating method that can detect borders of correction blocks independently of sector IDs so as to surely detect the borders of data blocks. SOLUTION: In the case of generating a synchronizing signal frame by applying modulation processing and attaching a synchronizing signal to a controller block configured by attaching an error correction code to a plurality of data blocks including at least attached information and recording information, a 1st synchronizing signal is given to the synchronizing signal frame placed at a border of the correction blocks and a 2nd synchronizing signal is given to the synchronizing signal frame located at the border of data blocks. Furthermore, synchronizing patterns included at least in the 1st and 2nd synchronizing signals have low similarity with each other.

92. 发明专利

JP2002227713A ELECTRONIC CONTROL THROTTLE BODY INTEGRAL TYPE AIR FLOW MEASURING DEVICE 审中-公开
公开(公告)号：JP2002227713A
公开(公告)日：2002-08-14
申请号：JP2002017829
申请日：2002-01-28
申请人： HITACHI LTD , HITACHI CAR ENG CO LTD
发明人： HIRAYAMA HIROSHI , IGARASHI SHINYA , ITSUJI TAKAYUKI , MAKIE YASUO
IPC分类号： F02D45/00 , F02D35/00 , F02D41/04 , F02D41/14 , F02D41/18 , F02D41/20 , F02D41/22 , F02M69/48
摘要： PROBLEM TO BE SOLVED: To provide an electronic control throttle body integral type air flow measuring device to output an air flow signal to remove an error to suppress discharge of noxious exhaust gas from an internal combustion engine and self- diagnose a failure of an air flow measuring device or an electronic control throttle body to prevent the occurrence of an accident and control an optimum intake air amount. SOLUTION: To perform measurement of an accurate air flow rate, measurement of a pressure, control of an air flow rate, and diagnosis of the failure at a lost cost, with the low man-hour, and a light weight, an air flow meter, a pressure gauge, an electronic control throttle body, and a microcomputer are integrally formed, and the measurement can be achieved by effecting correction, control, and diagnosis at its internal part. Thus, the high performance, low-cost, small size electronic control throttle body integral type air flow measuring device can be provided.

93. 发明专利

JP2001222867A DIGITAL SIGNAL RECORDING METHOD, AND INFORMATION RECORDING MEDIUM 失效
公开(公告)号：JP2001222867A
公开(公告)日：2001-08-17
申请号：JP2000032727
申请日：2000-02-04
申请人： HITACHI LTD
发明人： HIRAYAMA HIROSHI
IPC分类号： G11B20/14 , G11B20/12
摘要： PROBLEM TO BE SOLVED: To prevent error propagation caused by erroneous detection of a frame position by easily preventing erroneous detection of a synchronous frame position in one sector. SOLUTION: When one sector is divided into first, second,... (n)th regions by continuously arranging synchronizing signals of first, second,...(n)th (n: positive integer) being same for plural frames at least included in a sector at every (k) frames (k: positive integer), a gap between codes of bit patterns given to the first, second,...(n)th synchronizing signals of every (k) frames included in each region is made to be 2 or more. Or, bit patterns of which the number of reversed bits are mutually different are given.

94. 发明专利

JP2001112289A INVERTER DEVICE AND MOTOR DRIVE 失效
公开(公告)号：JP2001112289A
公开(公告)日：2001-04-20
申请号：JP28319999
申请日：1999-10-04
申请人： HITACHI LTD , HITACHI KEIYO ENG
发明人： HIRAYAMA HIROSHI , TAKADA NAOKI , HIROTA MASAYUKI
IPC分类号： H02P7/06 , H02P5/00
摘要： PROBLEM TO BE SOLVED: To attain early start for maintenance and inspection, while ensuring high reliability after AC voltage is shut down, as well as cost reduction and space saving, in an inverter device and a motor drive. SOLUTION: This inverter device and motor drive includes a main circuit smoothing capacitor 3 for smoothing direct current rectified by a main circuit converter 2 and turning it into a main circuit DC power source, a control circuit smoothing capacitor 9 for smoothing direct current rectified by a control converter 8 and turning it into a control circuit DC power source, a power circuit 6 for fan drive circuit converting the main circuit DC power source into a fan drive circuit driving power source, and a power circuit 10 for control circuit converting the control circuit DC power source into a control circuit drive power source.

95. 发明专利

JP2000322827A DISC-SHAPED RECORDING MEDIUM AND RECORDING APPARATUS, REPRODUCING APPARATUS, MULTIPLE STREAM PROCESSING APPARATUS THEREFOR 失效
公开(公告)号：JP2000322827A
公开(公告)日：2000-11-24
申请号：JP12673099
申请日：1999-05-07
申请人： HITACHI LTD
发明人： HIRAYAMA HIROSHI
IPC分类号： H04N5/85 , G11B20/10 , G11B20/12 , G11B27/00 , H04N5/91 , H04N5/92 , H04N7/08 , H04N7/081
摘要： PROBLEM TO BE SOLVED: To separately record a packet of a program to be recorded by a plurality of kinds to a disc recording medium by setting the program to be recorded within programs on a time division multiple stream, detecting identification information of the packet and recording the extracted packet to the recording medium when the identification information is an identification information corresponding to the program to be recorded. SOLUTION: A system controller A15 outputs a first and a second recording packet IDs in accordance with a first and a second record program settings and, a first and a second recording packet separation start/end commands in accordance with a first and a second program recording start/end control command to a packet ID detect circuit 12. The packet ID detect circuit 12 controls a RAM 1 control circuit 10, separates packets of the first and second recording packet IDs from a multiple stream, writes to a RAM 1 11 a recording packet of several minutes necessary for a correction block as a recording unit to an optical disk 1, and outputs via an information addition detect circuit 8 to a digital signal process circuit 6.

96. 发明专利

JPH11232797A DISK REPRODUCING DEVICE AND REPRODUCING METHOD 失效
公开(公告)号：JPH11232797A
公开(公告)日：1999-08-27
申请号：JP3553398
申请日：1998-02-18
申请人： HITACHI LTD
发明人： NAGAI YUTAKA , AOKI DAN , HIRAYAMA HIROSHI , GUNJI HIROYUKI
IPC分类号： G11B20/12 , G11B20/14
摘要： PROBLEM TO BE SOLVED: To enhance the reliability of data by detecting the correct intra-sector position of a scratch on a disk based on the continuity of the intra-sector position codes generated according to the arrangement of consecutive synchronizing signals and supplementing the position code. SOLUTION: A sync code 4 is generated from the synchronizing signal fetched from data 1 in a sync code converting means 3 and a detection position code 6 expressing a frame position is generated by a four continuous synchronizing signal judging means 5 by referring a detection position code generating table and its continuity is judged by a continuity comparating means 11 while using the detection state signal 8 of the position code. A detection position code continuity effective signal 14 is generated by the logical product of a continuity judgement flag 12 and the detection position code effective signal 7 of the detection position code 6 and when the signal 14 is '1', the position code 6 is loaded to an interpolation counter 15 and when the signal 14 is not '1', the counter is incremented and its value is outputted as an intra-sector code 16. Thus, the discontinuity of the detection position code and an erroneous detection sync are supplemented.

97. 发明专利

JPH11183221A HEATING RESISTOR TYPE AIR FLOW RATE MEASUREMENT APPARATUS 失效
公开(公告)号：JPH11183221A
公开(公告)日：1999-07-09
申请号：JP35129897
申请日：1997-12-19
申请人： HITACHI LTD , HITACHI CAR ENG CO LTD
发明人： ITSUJI TAKAYUKI , HIRAYAMA HIROSHI
IPC分类号： G01F1/68 , G01F1/696 , G01F1/698
摘要： PROBLEM TO BE SOLVED: To provide a heating resistor type air flow rate measurement appara tus which has no fear of malfunctioning against noise due to a high surge current and easily adaptable to forming the body out of a synthetic resin. SOLUTION: The flow measurement apparatus having a heating resistor 1 and thermosensitive resistor 2 disposed in a main air passage 31 comprises inductors 21-24 for preventing noises from entering a line connecting these resistors 1, 2 in a flow rate measuring circuit 50. This renders a satisfactory radio wave trouble resistance, without influence of a surge current from capacitors in a lowpass filter and permits the cost and wt. to be reduced enough by making components from synthetic resins.

98. 发明专利

JPH116750A AIR FLOW RATE MEASURING DEVICE 失效
公开(公告)号：JPH116750A
公开(公告)日：1999-01-12
申请号：JP16467598
申请日：1998-06-12
申请人： HITACHI LTD , HITACHI CAR ENG CO LTD
发明人： IGARASHI SHINYA , HIRAYAMA HIROSHI , KOBAYASHI CHIHIRO , TSUTSUI MITSUKUNI , KATO YUKIO
IPC分类号： G01F1/68 , G01F1/684
摘要： PROBLEM TO BE SOLVED: To enable air flow rate measurement with high precision by a method wherein a position and a size of an inlet opening face and an outlet conflux part of a sub-air passage and a protrusion shape of an upstream of an outlet conflux part are optimized. SOLUTION: On both sides of a bridge body 2 on an upstream side of an outlet conflux part of a sub-air passage 4, a protrusion 1 is formed. As a flow velocity of an upstream of an outlet of the sub-air passage is increased by the protrusion 1, an outlet part of the sub-air passage 4 acts so that an air flow rate of the sub-air passage is increased. Accordingly, with respect to a drift having a mountain-like flow velocity distribution in an air flowing into an air flow rate measuring device, a flow velocity at near a wall face of a main air passage 5 is slow in a mountain-like flow velocity distribution compared with the case of a uniform flow. Therefore, since separation is small and a pressure depression at a sub-air passage outlet is smaller than the uniform flow, an air flow of the sub-air passage 4 acts to a decreasing direction. Therefore, a sub-air passage inlet 4a has a shape which takes in a flow containing a center of the main air passage 5 and an output increase of the air flow rate measuring device caused by the shape is made possible to be reduced.

99. 发明专利

JPH10320926A INFORMATION RECORDING MEDIUM 失效
公开(公告)号：JPH10320926A
公开(公告)日：1998-12-04
申请号：JP14870798
申请日：1998-05-29
申请人： HITACHI LTD
发明人： HIRAYAMA HIROSHI , KAWAMAE OSAMU , HIRABAYASHI MASAYUKI , NAGAI YUTAKA , TAKEUCHI TOSHIFUMI
IPC分类号： G11B20/12 , G11B7/00 , G11B7/004 , G11B7/0045 , G11B7/005 , G11B7/30 , G11B19/02 , G11B20/10 , G11B27/00 , G11B27/02 , G11B27/034 , G11B27/10 , G11B27/34
摘要： PROBLEM TO BE SOLVED: To enable the access to and reproduction from both of 1st and 2nd recording surfaces of a disc which enables reading from the one surface of the disc while the compatibility with an existing interface is maintained by a method wherein a series of addresses are allotted to every block over all the recording surfaces of the disc. SOLUTION: When digital signals are recorded, data blocks consisting of recordable (n) blocks are arranged in the order of recording over all the recording surfaces of an optical disc 1. A lead-in block 205 containing disc information is added to the leading end of the arranged data blocks to compose one data frame 207. The blocks from the lead-in block 205 to the block address (m) are recorded on a 1st recording surface 208 from its innermost circumference toward its outer circumference. The blocks from the block address (m+1) to the block address (n) are recorded on a 2nd recording surface 209 from its outermost circumference toward its inner circumference. With this constitution, a series of block addresses can be allotted over all the recording surfaces.

100. 发明专利

JPH10241267A DISK REPRODUCING DEVICE 失效
公开(公告)号：JPH10241267A
公开(公告)日：1998-09-11
申请号：JP4186697
申请日：1997-02-26
申请人： HITACHI LTD
发明人： HIRAYAMA HIROSHI , TAKEUCHI TOSHIFUMI , HIBINO MITSUAKI
IPC分类号： G11B19/28 , G11B19/06 , G11B19/12
摘要： PROBLEM TO BE SOLVED: To reproduce a disk recorded in a different format at a constant linear velocity by detecting speed information from a regenerative signal on the disk. SOLUTION: A forced rotation command is issued to a disk motor control circuit 20 by a system controller 21 in response to the detection of inserting the disk to forcibly rotate a disk motor 6, and a pickup 2 is moved into a read-in area of the disk 1 by a pickup control circuit 7 to perform access and reproducing. Then, after performing prescribed signal processing by a digital signal processing circuit 4, a recording format of the presently inserted disk 1 is discriminated by a read-in information detecting circuit 5, and its discriminated result (detection of an optical disk recorded in a format-1 or a format-2) is sent to the system controller 21.

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