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1. 发明专利

JPS63124606A ON-VEHICLE ANTENNA SYSTEM 失效
公开(公告)号：JPS63124606A
公开(公告)日：1988-05-28
申请号：JP27048186
申请日：1986-11-13
申请人： YAGI ANTENNA , HITACHI LTD
发明人： IMAI TAKESHI , TAKAHASHI AKIRA , MINASE ATSUSHI , HARADA NOBUYUKI
IPC分类号： H01Q21/06 , H01Q1/32 , H01Q21/22 , H01Q21/24 , H01Q21/30
摘要： PURPOSE:To receive both FM/AM broadcast waves with excellent sensitivity by forming a slot to a metallic plate face arranged with an insulation gap to the outer face of the metal-made car body and connecting an outer sheath conductor grounded to the car body via a core conductor of a feeder and a middle wave band blocking capacitor to the middle of one side and the other side of the slot respectively. CONSTITUTION:An antenna 11 is arranged to a roof part 12a of a metal-made car body 12. The antenna 11 is provided with a T-shaped metallic flat plate 13 being an antenna element and slots 14a,14b are formed to the surface of the metallic flat plate 13 along each T-shaped side. In this antenna 11, the slots 14a,14b formed to the metallic flat plate 13 act like a slot antenna with respect to VHF, UHF bands, and the metallic flat plate 13 provided to the car body 12 with an insulation gap acts like a capacitive antenna to the middle wave band. Thus, a two-frequency band common use antenna is obtained to any of the AM and FM waves with excellent sensitivity.

2. 发明专利

JPS62293803A ANTENNA SYSTEM FOR VEHICLE 失效
公开(公告)号：JPS62293803A
公开(公告)日：1987-12-21
申请号：JP13746786
申请日：1986-06-13
申请人： YAGI ANTENNA , HITACHI LTD
发明人： IMAI TAKESHI , TAKAHASHI AKIRA , HARADA NOBUYUKI
IPC分类号： H01Q1/32 , H01Q1/40 , H01Q9/28
摘要： PURPOSE:To attain sufficient performance without projecting provision of an antenna at the outside of a car body by coating the surface of a metallic plate by an insulating material and arranging the coated plate at the outside of the car body. CONSTITUTION:An antenna 3 is arranged to a recess 2a formed to a car body 1 made of a metal, e.g., to the front part of a roof 2. The antenna 3 has a prescribed gap to the roof 2 and the surface of the metallic plate 3a having through holes is coated by an insulation material 3b such as an FRP and the coated plate is arranged to the gap. Thus, the car body 2 and the antenna 3 are insulated electrically, the sheath of a feeder, e.g., one end of a coaxial cable 4 is connected to the car body 1, the core is connected to the antenna 3 and the other end is connected to an antenna terminal of a receiver 5. Thus, the antenna 3 is not projected at the outside of the car body 1 and the antenna conductor offers a large area, then a sufficient induced voltage is obtained to the reception signal.

3. 发明专利

JPS63124605A ON-VEHICLE ANTENNA SYSTEM 失效
公开(公告)号：JPS63124605A
公开(公告)日：1988-05-28
申请号：JP27048086
申请日：1986-11-13
申请人： YAGI ANTENNA , HITACHI LTD
发明人： IMAI TAKESHI , TAKAHASHI AKIRA , HARADA NOBUYUKI
IPC分类号： H01Q1/32
摘要： PURPOSE:To obtain a practically sufficient reception performance without a projecting antenna part at the outside of a vehicle by arranging a plate metallic body to an outer side lower face of a car body with a gap by an insulator and connecting a feeder end to the metallic body and the car body respectively. CONSTITUTION:An antenna 11 is provided with a metallic plate 11 being an antenna element. The surface of the metallic plate 11a is coated by an insulator 11b made of a reinforced plastic such as FRP and arranged to a face of the lower part 13 of a rear trunk with a prescribed gap. That is, the car body 12 and the metallic plate 11a are insulated electrically and a core wire is connected to the metallic plate 11a, the outer conductor of one end of the feeder 14 such as a coaxial cable is connected to the car body 12 and the other end is connected to a receiver. Thus, since the the metallic plate 11a being the antenna element is arranged to the outer side face of the car body 12, the external appearance of the car body is not deteriorated and no wind break noise is caused and noise from a microcomputer in the car body and a heater or the like is shielded.

4. 发明专利

JPS62293802A ANTENNA SYSTEM FOR VEHICLE 失效
公开(公告)号：JPS62293802A
公开(公告)日：1987-12-21
申请号：JP13746686
申请日：1986-06-13
申请人： YAGI ANTENNA , HITACHI LTD
发明人： IMAI TAKESHI , TAKAHASHI AKIRA , HARADA NOBUYUKI
IPC分类号： H04B1/08 , H01Q1/32
摘要： PURPOSE:To improve the reception characteristic by connecting an antenna terminal of a reception section to a feeding end of an antenna directly and operating the reception section by an operation section placed on a driver's seat. CONSTITUTION:An antenna 12 such as A rod antenna is projected to a proper position of a car body 11, the antenna terminal of the reception section 13 is connected directly to the feeding end of said antenna, that is, the antenna 12. Further, the reception section 13 selects an object signal from the received radio wave, amplifies/detects it to obtain a low frequency output signal. Then the operation section 14 is arranged to the driver's seat, a control signal is given to the reception section 13 via a control cable 15 to operate it thereby allowing the driver to adjust the channel selection and volume control from the driver's seat. Since the feeder capacitance is eliminated entirely, an induced voltage of the antenna is led to the reception section with high efficiency without any loss.

5. 发明专利

JP2000067509A DISK DEVICE 失效
公开(公告)号：JP2000067509A
公开(公告)日：2000-03-03
申请号：JP23305998
申请日：1998-08-19
申请人： HITACHI LTD
发明人： TAJIMA HISANOBU , ONO KAZUHIKO , IKEDA EIJI , IMAI TAKESHI , IWATANI TAKAO
IPC分类号： G11B19/12 , G11B7/00 , G11B7/004
摘要： PROBLEM TO BE SOLVED: To provide a disk device capable of shortening the time required for preparatory operation by carrying out the preparatory operation for efficient data reading. SOLUTION: The disk device which is capable of reading the data from a disk of a first diameter and a disk of a second diameter longer than this first diameter is so constituted that the information on the data recording quantity is read from the first or second disk and that the discrimination operation as to whether the disk of the first diameter or the disk of the second diameter is not carried out when judgment is made that the data recording quantity exceeds the data recording quantity recordable on the disk of the first diameter.

6. 发明专利

JP2000057596A OPTICAL DISK DEVICE 失效
公开(公告)号：JP2000057596A
公开(公告)日：2000-02-25
申请号：JP22385098
申请日：1998-08-07
申请人： HITACHI LTD
发明人： TAJIMA HISANOBU , ONO KAZUHIKO , FUKUSHIMA AKIO , IMAI TAKESHI
IPC分类号： G11B7/085 , G11B7/09
摘要： PROBLEM TO BE SOLVED: To reapply a tracking servo and to normally control tracking by generating a second control signal after a prescribed time elapses since a first control signal has been generated, interrupting a tracking servo loop by the first control signal and connecting the interrupted tracking servo loop by the second control signal. SOLUTION: A go-by pulse is transmitted to an MPU: 6, and the pulse is detected or monitored, and its occurrence time is measured. When the occurrence time elapses a prescribed time, judging that a state out of tracking servo loop isn't recovered, the MPU: 6 issues a command to turn off switches 14, 16 to a controller 17 of a servo processor 5. Thus, a tilt of an optical pickup 1 is resumed, and free vibration is started. The MPU: 6 outputs again the command to turn on the switch 14 to the controller 17 of the servo processor 5 by considering the vibration convergent time of the optical pickup 1.

7. 发明专利

JPH10117323A VIDEO RECORDING DEVICE AND VIDEO REPRODUCING DEVICE 失效
公开(公告)号：JPH10117323A
公开(公告)日：1998-05-06
申请号：JP26822796
申请日：1996-10-09
申请人： HITACHI LTD
发明人： TAJIMA HISANOBU , SEKIYA MASATAKA , IWATANI TAKAO , SUZUKI KOICHI , SUGANO YOSHIYUKI , TAKAHASHI KENJI , MAEDA AKINORI , IMAI TAKESHI
IPC分类号： H04N5/765 , H04N5/781 , H04N5/92
摘要： PROBLEM TO BE SOLVED: To record recording state information without degrading a main image by converting the recording state information to a still picture, compressing it to digital information and recording the compressed recording state information and the digital main image converted information, while multiplexing them in time-division. SOLUTION: A main video signal is inputted to an encoding device 11. The encoding device 11 converts the main video signal to digital information, and the digital main image encoded information is inputted to a multiplexing means 12. On the other hand, a controller 14 converts the recording state information such as the date, time and channel number of recording to still picture information and inputs it to an encoding device 15. The encoding device 15 compresses still picture information to simple digital information and inputs it to the multiplexing means 12. The multiplexing means 12 multiplexes the digital encoded main video information and the simple digital compressed recording information in time-division and inputs the result to an optical writing means 13. The optical writing means 13 writes the time-division multiplexed information onto an optical disk.

8. 发明专利

JP2000057593A OPTICAL DISK DEVICE 失效
公开(公告)号：JP2000057593A
公开(公告)日：2000-02-25
申请号：JP22384998
申请日：1998-08-07
申请人： HITACHI LTD
发明人： IMAI TAKESHI , TAJIMA HISANOBU , ONO KAZUHIKO , FUKUSHIMA AKIO
IPC分类号： G11B7/085 , G11B7/09 , G11B19/04
摘要： PROBLEM TO BE SOLVED: To easily focus on a layer of a moving destination by supplying a kick voltage to an optical pickup when acceleration of a wobbly surface of an optical disk becomes a prescribed value away from the center of the acceleration. SOLUTION: When the optical pickup PU: 4 focalizes on a recording surface of a first layer 2 from a data reproducing state of the recording surface of a second layer 3 of the disk 1, it applies an opposite polarity kick voltage to a focus coil to move the movable part of the PU: 4 toward the first layer 2. A focus error signal outputted from an RF amplifier 5 is supplied to a CPU: 12, and its low-pass component is amplified by an amplifier 13 to be supplied to the CPU: 12. Then, the voltage of the focus error signal is A/D converted by the CPU: 12, and the maximum value and the minimum value of the error signal are obtained, and by calculating its middle timing, a point of time when the acceleration of the wobbly surface of the disk 1 in the vertical direction becomes nearly zero is calculated.

9. 发明专利

JPH10222965A OPTICAL DISK RECORDING/REPRODUCING APPARATUS 失效
公开(公告)号：JPH10222965A
公开(公告)日：1998-08-21
申请号：JP2478297
申请日：1997-02-07
申请人： HITACHI LTD
发明人： SEKIYA MASATAKA , TAJIMA HISANOBU , IWATANI TAKAO , SUZUKI KOICHI , IMAI TAKESHI , TAKAHASHI KENJI , MAEDA AKINORI
IPC分类号： G11B20/12 , G11B27/00
摘要： PROBLEM TO BE SOLVED: To enable use of a disk as in a video tape by comparing, on the occasion of over-writing on the recorded disk, the recording start and end addresses of the over-writing program with the recording start and end addresses of the recorded program on the management block and then updating the management block. SOLUTION: A program 4 is over-written on a disk having the recorded programs 1 to 3. The start and end addresses Pro 1S to 3E of the programs 1 to 3 are compared with the start and end addresses Pros 4S, 4E of the program 4, the end address, namely Pro 2E of the recorded program which is larger than Pro 4S and nearest is updated to one preceding address of Pro 4S, and the start address namely Pro 3S of the recorded program which is smaller than Pro 4E and is nearest is updated to one subsequent address of Pro 4E to update the management block. Thereby, the disk may be used like a video tape in such a manner that only the over-written part can be erased.

10. 发明专利

JP2000311357A DISK DEVICE 失效
公开(公告)号：JP2000311357A
公开(公告)日：2000-11-07
申请号：JP11765999
申请日：1999-04-26
申请人： HITACHI LTD
发明人： IMAI TAKESHI , MINODA HIROSHI
IPC分类号： G11B19/12 , G11B7/004 , G11B7/085 , G11B7/09
摘要： PROBLEM TO BE SOLVED: To efficiently execute a preparation operation for data read by emitting light of the first laser during a period closing an object lens to a disk, emitting light of the second laser during a period keeping away the object lens from the disk, and recognizing a kind of the disk based on signals obtained from the disk. SOLUTION: After emitting light of a laser for CD, descending an object lens positioned at the lens center to a position keeping away from the disk to the direction of the disk thickness, and positioning at the lower point, a disk is rotated. Next the object lens is ascended to a position close to the disk to the direction of the disk thickness and a change of FE signal is measured. Next a laser for CD is put off, a laser for DVD emits light, the object lens is descended this time to a position keeping away from the disk to the direction of the disk thickness and a change of FE signal is measured. This measured result, this measured result of amplitude value, is memorized as a discrimination material of the kind of the disk.

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