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31. 发明专利

JPS53138620A RADIO RECEIVER 失效
公开(公告)号：JPS53138620A
公开(公告)日：1978-12-04
申请号：JP5308677
申请日：1977-05-11
申请人： HITACHI LTD
发明人： INOUE SHIGEKI , AKITAKE ISAO , ISO YOSHIMI
IPC分类号： H03L7/18 , H03J5/02 , H04B1/26
摘要： PURPOSE:To enable a reception of plural receiving bands of different frequency bands by obtaining the division ratio in accordance with the receiving band for the radio receiver of digital synthesizer system in case the receiving band is changed over.

32. 发明专利

JPS53136463A AMPLIFYING CIRCUIT 失效
公开(公告)号：JPS53136463A
公开(公告)日：1978-11-29
申请号：JP5070877
申请日：1977-05-04
申请人： HITACHI LTD
发明人： AKITAKE ISAO , INOUE SHIGEKI
IPC分类号： G11B5/035 , H03F1/26 , H03F1/34 , H03H11/04
摘要： PURPOSE:To reject high frequency interference signals without deteriorating S/N, by inserting an inductance between the emitter of first stage transistor and the feedback circuit determining RIA performance.

33. 发明专利

JPS5266357A GAIN CONTROL CIRCUIT 失效
公开(公告)号：JPS5266357A
公开(公告)日：1977-06-01
申请号：JP14167775
申请日：1975-11-28
申请人： HITACHI LTD
发明人： INOUE SHIGEKI , IENAKA MASANORI , KOMINAMI YASUO
IPC分类号： H04B1/10 , H03G3/10 , H03G3/20 , H03G3/26 , H03G3/34
摘要： PURPOSE:To improve SN ratio at the time of low signal level and to deaden unpleasant noises of the receivers, by modifying the transistor of constant-current circuit, to be connected to the variable impedance circuit consisting a mute circuit which is used in the receivers, into a resistance emitter of grounded type so that the working range is changed.

34. 发明专利

JPH10255276A OPTICAL DISC DEVICE 失效
公开(公告)号：JPH10255276A
公开(公告)日：1998-09-25
申请号：JP5471697
申请日：1997-03-10
申请人： HITACHI LTD
发明人： SHOJI TOSHIRO , MINODA HIROSHI , INOUE SHIGEKI
IPC分类号： G11B19/12 , G11B7/004 , G11B7/085
摘要： PROBLEM TO BE SOLVED: To reproduce a requested recording layer quickly and without fail by a method wherein, if the transfer of the focus of an object lens is failed when a recording layer to be reproduced is changed while one of the recording layers of an optical disc having 2 or more recording layers on its one side is reproduced, a requested recording layer is identified from a focus error signal and focus servo is applied. SOLUTION: When a recording layer to be reproduced is changed, the focus of an object lens is transferred by the changeover of a switch 13. When the object lens is transferred by a signal which is generated in accordance with the detection of the change a focus error signal outputted by a preamplifier circuit 3, the switch 13 is so controlled as to be changed over to an actuator driver 9 side. If a focus signal following the transfer of the object lens is not obtained by the flaw of an optical disc 1, etc., and the transfer of the object lens is failed, the object lens is transferred downward and a focus error signal outputted by the preamplifier circuit 3 is detected and then the switch 13 is changed over to the actuator driver 9 side to detect a requested recording layer which is reproduced.

35. 发明专利

JPH10228717A OPTICAL DISK DEVICE 失效
公开(公告)号：JPH10228717A
公开(公告)日：1998-08-25
申请号：JP3002397
申请日：1997-02-14
申请人： HITACHI LTD
发明人： HOSHI MICHIYA , MINODA HIROSHI , INOUE SHIGEKI , TANAKA HIROYUKI
IPC分类号： G11B19/12 , G11B7/004 , G11B7/085
摘要： PROBLEM TO BE SOLVED: To reduce the possibility of damaging a disk during disk discrimination by inverting the moving direction of an objective lens when a reflection light is reduced in the case of a single focus lens and when the third reflection light is reduced in the case of a double focus lens at the time of moving the objective lens up/down in a focusing direction. SOLUTION: An objective lens is moved up/down in a focusing direction and, with the passage of specified time after a reflection light is obtained, the moving direction of the objective lens is inverted. Alternatively, the position of the objective lens is moved to a lowest point in a moving range beforehand, and then up/down control is performed by a lens up/down control circuit 13. If a signal focus lens is used, a reproducing RF signal has one peak (reflection light). Thus, by detecting the reduction of a reflection light from a disk and inverting the lens, the clashing of the objective lens with the disk is prevented.

36. 发明专利

JPH1079126A ACCESSING METHOD FOR OPTICAL DISK DEVICE 失效
公开(公告)号：JPH1079126A
公开(公告)日：1998-03-24
申请号：JP3882697
申请日：1997-02-24
申请人： HITACHI LTD
发明人： ONO KAZUHIKO , IKEDA EIJI , MINODA HIROSHI , FUKUSHIMA AKIO , SHIOYAMA HIROAKI , INOUE SHIGEKI
IPC分类号： G11B7/085 , G11B7/004 , G11B7/007
摘要： PROBLEM TO BE SOLVED: To move an optical pick-up to a target position at a high speed, by moving an objective lens so as to focus on a target layer when a recording layer of target information differs, and then calculating the distance between two physical positions, that is, the current position and the target position. SOLUTION: First, the position of an optical pick-up for reading current position information recording on a disk is checked. Then, it is judged whether the recording position of target information is equal to the current recording layer. When the recording position of target information is not equal to the current recording layer, an objective lens is moved in a direction perpendicular to the disk so as to focus on the target layer. Then, the current position of the optical pick-up is checked. The current position and the target position are converted to physical positions on the disk, and the distance between the relative two points is calculated. Thus, the optical pick-up may be moved to the target position at a high speed without reading the position information recorded on the disk during moving. After the movement, the pick-up is caused to access the target information recording position while the position information recorded on the disk is checked. Thus, high-speed access is easily carried out.

37. 发明专利

JPH05250804A 失效
公开(公告)号：JPH05250804A
公开(公告)日：1993-09-28
申请号：JP5078992
申请日：1992-03-09
申请人： HITACHI LTD
发明人： TAKEUCHI TOSHIFUMI , INOUE SHIGEKI , FUKUSHIMA AKIO , ARAI TAKAO
IPC分类号： G11B20/10 , G11B19/28 , G11B20/14
摘要： PURPOSE:To improve an accessing speed at a reproducing time by controlling a disk recorded at a constant linear velocity to a constant angular velocity and changing a reference clock frequency corresponding to the transmission speed of a digital regenerative signal. CONSTITUTION:The rotation of a motor 2 is controlled so as to be a constant angular velocity with a rotational speed detection signal S1 from the motor 2 by a motor control circuit. Further, an error signal S2 is supplied to a control circuit 6 after a signal from an optical pickup 4 is amplified by a preamplifier 7 and a regenerative signal is supplied to a clock reproducing circuit 8 and the clock of a transmission speed frequency synchronizing with the regenerative signal is generated and outputted to a signal processing circuit 9. The code data of the regenerative signal is detected in the processing circuit 9 and sent to a micro computer 10 and a moving amount till a reproducing position is operated based on an access instruction and access operation is instructed to the control circuit. Thus, the motor is rotated at a constant angular velocity and a motor control time for making a constant linear velocity is eliminated and a reproduction accessing speed is improved.

38. 发明专利

JPH0528648A ELECTRONIC PICTURE-CARD SHOW 失效
公开(公告)号：JPH0528648A
公开(公告)日：1993-02-05
申请号：JP18725191
申请日：1991-07-26
申请人： HITACHI LTD
发明人： NAKAI NOBUO , INOUE SHIGEKI , OTAKE MASATOSHI
IPC分类号： G11B20/10 , G11B20/12 , H04N5/85 , H04N5/91 , H04N5/92
摘要： PURPOSE:To provide a recording system and its reproducing device with a digital disk on which sound video and control signals are mixedly recorded and with which a paper medium cartoon is realized. CONSTITUTION:A control information region is provided for every block which is constituted by a prescribed amount of data. By prescribed control instructions and parameters, the data processing system is designated and the reproducing device performs a synchronized reproduction of sound and video, special reproduction of video, retrieving while looking at a display screen, adding display data such as a table of contents and continuous reproduction of signals prior to or after a power supply interruption.

39. 发明专利

JPH0264966A OPTICAL DISK REPRODUCING DEVICE 失效
公开(公告)号：JPH0264966A
公开(公告)日：1990-03-05
申请号：JP13010588
申请日：1988-05-30
申请人： HITACHI LTD
发明人： HASE HARUMI , IKEDA KAZUO , FUKUSHIMA YOSHIO , INOUE SHIGEKI
IPC分类号： G06F3/06 , G06F3/08 , G11B20/10 , H04N5/92 , H04N5/937
摘要： PURPOSE:To display image data at a high speed by actuating a restoring circuit with a control part, reading a signal from an optical disk and simultaneously transferring restoring processing and post-restoring data from an interface circuit part to an external personal computer. CONSTITUTION:A control part 10 actuates a restoring circuit part 7, reads data, which are written to a ring buffer 6, and writes restoring processing and post-restoring data 11 of the image data to a restoring data frame memory 8. When the personal computer is in a transferring receivable condition, the data in a transferring subject range 15 and the restored data are started to be transferred as transferring data 18 from an interface circuit part 9. Next, the reading of the same image data to the other range is requested from the personal computer, the stored contents of the restoring data frame memory 8 are immediately transferred to the personal computer. Thus, a time up to the display of the image data can be shortened.

40. 发明专利

JPH01134782A METHOD FOR PRECEDENT SEEKING RETRIEVAL FOR CD-ROM DISK 失效
公开(公告)号：JPH01134782A
公开(公告)日：1989-05-26
申请号：JP29208087
申请日：1987-11-20
申请人： HITACHI LTD
发明人： IKEDA KAZUO , HASE HARUMI , ONO KAZUHIKO , INOUE SHIGEKI
IPC分类号： G11B27/10 , G06F17/30
摘要： PURPOSE:To shorten a retrieval necessary time by causing a reading head to seek to pertinent data position on an optical disk in parallel for 1 digit inputs and executing the high-speed retrieval of the said data, without waiting for the input completion of all retrieval codes of N-digits. CONSTITUTION:At the time of retrieving the data, when a retrieval code composed of the N-digits is inputted, the precedent seeking of a head 12 of a CD- ROM drive is executed to pertinent data positions 9-11 in a CD-ROM disk 13 each time one figure or character is inputted without waiting for the inputs of the all digits of the retrieval code. Thus, since, at the same time as the last 1 digit input completion of the retrieval code of the N-digits, the head 12 seeking of the CD-ROM drive is also completed and, thereby, a seeking standby time for moving the head 12 is made into 0, an access high-speed in appearance can be executed, and the retrieval necessary time can be shortened.

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