专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明专利

JP2003242658A OPTICAL DISK DRIVE 审中-公开
公开(公告)号：JP2003242658A
公开(公告)日：2003-08-29
申请号：JP2002036966
申请日：2002-02-14
申请人： TEAC CORP
发明人： ONDA HIROYUKI , MINASE MINORU
IPC分类号： G11B7/085
摘要： PROBLEM TO BE SOLVED: To provide an optical disk drive reducing the error of a Miller signal when the standardized optical disk and nonstandardized optical disk are played back. SOLUTION: In the optical disk drive for obtaining the Miller signal by detecting a bottom signal from a signal played back from the optical disk and binarizing the bottom signal by comparting it with a reference level signal, a linear velocity measuring device for measuring the linear velocity at the playback operation of the specified position of the optical disk and a reference level variable setting means for variably setting the reference level signal when the measured linear velocity is lower than the prescribed value are provided, thereby, which disk is being produced out of the standardized optical disk and nonstandardized optical disk, is recognized from the measured linear velocity, and for the nonstandardized optical disk, the error of the Miller signal is reduced by variably setting the reference level signal. COPYRIGHT: (C)2003,JPO

2. 发明专利

JPH09213001A DISK DEVICE 失效
公开(公告)号：JPH09213001A
公开(公告)日：1997-08-15
申请号：JP1799296
申请日：1996-02-02
申请人： TEAC CORP
发明人： ONDA HIROYUKI , ENAMI KATSUYA
IPC分类号： G11B19/28 , G11B19/00
摘要： PROBLEM TO BE SOLVED: To reduce the consumption of a battery by switching to an operation mode for performing recording/reproducing at a high speed when a disk device is driven by a commercial power source and switching to a 2nd operation mode for performing recording/reproducing at a low speed when the device is driven by the battery. SOLUTION: When the battery 19 is connected to a battery socket 20, a power source of +5V is supplied from the battery 19 to a power source terminal T1 of the disk device and a power source terminal T2 of a personal computer main body. Since a diode D for generating a power source discriminating signal is reversed at this time, a line from a positive terminal TBATT+ to a power source discriminating terminal T3 is at a low level. Then, when a plug 21 is connected to a DC socket 18, the direction from a positive terminal TDC+ of the socket 18 to the terminal T1 and the terminal T2 is the same as the forward direction of the diode D, so that a DC power source from the plug 21 is supplied via the diode D to the terminals T1 and T2 .

3. 发明专利

JPH08227561A OPTICAL DISK REPRODUCING DEVICE 失效
公开(公告)号：JPH08227561A
公开(公告)日：1996-09-03
申请号：JP3231995
申请日：1995-02-21
申请人： TEAC CORP
发明人： ONDA HIROYUKI , FUJIMOTO MAKOTO , ASANO NAOTAKE , HOSONO YASUSHI
IPC分类号： G11B19/28 , G11B7/00 , G11B7/005 , G11B19/02 , G11B20/18
摘要： PURPOSE: To make a device have a high speed reproducing function of data and to reduce incidence of a read error which cannot be corrected. CONSTITUTION: An optical disk reproducing means 1 reproduces data with the prescribed data reproducing speed set by the optical disk or a data reproducing rate faster than a prescribed data reproducing rate. An error correction processing means 2 performs error detection and error correction for the prescribed data length, outputs reproduced data in which an error is already corrected, when error correction cannot be performed, a correction impossible error signal is outputted. A reproduction control means 3 sets the fastest data reproducing speed for the optical disk reproducing means 1 in an initial stage state, when reproduction cannot be performed without causing a correction impossible error even if reproduction is repeated by controlling the optical disk reproducing means 1 for data of the prescribed length in which a correction impossible error is caused, the means 3 sets a data reproducing speed slower than the present data reproducing rate for the optical disk reproducing means 1.

4. 发明专利

JPH0676295A DEVICE FOR DRIVING OPTICAL DISK 失效
公开(公告)号：JPH0676295A
公开(公告)日：1994-03-18
申请号：JP19155791
申请日：1991-07-31
申请人： TEAC CORP , MITSUBISHI ELECTRIC CORP
发明人： ONDA HIROYUKI , MURATA HIDEHIKO , NAGATA TAKUYA , MASHITA TSUGUAKI , YOSHIMOTO KYOSUKE , OZAKI MINORU , FURUKAWA TERUO
IPC分类号： G11B7/00 , G11B7/004
摘要： PURPOSE:To save capacity in a buffer memory storing temporarily recording/ reproducing data in an optical disk and to use it for a data cache. CONSTITUTION:As the buffer memory 19, though a ring buffer divided to areas in plural addresses in the optical disk and capable of accessing circularly, it is realized by a RAM address specified by an address counter 22, and a head address is addressed continuously succeedingly to a final address equivalently. Further, the data is stored in entire areas of the buffer memory 19 by a control part 14 at a reproducing time, and the data is looked-ahead, and a relation between the storage address in the buffer memory 19 and a recording logic address in the optical disk 2 is stored in a logic address control memory 21 previously. At the time of access after a next time, when the data in a sector stored in the buffer memory 19 is requested, the optical disk 2 is not accessed, only the buffer memory is accessed.

5. 发明专利

JPH04206037A OPTICAL DISK APPARATUS 失效
公开(公告)号：JPH04206037A
公开(公告)日：1992-07-28
申请号：JP33753190
申请日：1990-11-30
申请人： TEAC CORP , MITSUBISHI ELECTRIC CORP
发明人： MASHITA TSUGUAKI , ONDA HIROYUKI , NAGATA TAKUYA , MURATA HIDEHIKO , YOSHIMOTO KYOSUKE , KOYANAGI KIMIYUKI , FURUKAWA TERUO
IPC分类号： G11B7/09
摘要： PURPOSE:To prevent errors of recorded information and reproduced information due to a change in an ambient temperature by detecting the ambient temperature at a place wherein an optical disk apparatus is installed and by altering an amount of control on the state of irradiation of a light beam when recording and reproduction instruction signals are not generated for a prescribed time. CONSTITUTION:A detection output of a temperature detector 20 is inputted to a control element 8, and the control element 8 detects an ambient temperature. When a timer T starts time count from a time point of non-generation of instruction signals for recording and reproduction of information and counts a prescribed time, in other words, when the instruction signals are not generated for the prescribed time, the control element 8 judges that the recording and reproduction of the information are not executed, and alters an amount of control for driving a linear motor 1c and an electromagnetic actuator 1d, on the basis of moving average values of offset and gain in the past. When the ambient temperature of a place of installation changes, according to this constitution, an amount of control on the state of irradiation of a light beam is corrected in terms of temperature and thereby errors of recorded information and reproduced information can be prevented.

6. 发明专利

JPH04195734A FOCUS SERVO CIRCUIT 失效
公开(公告)号：JPH04195734A
公开(公告)日：1992-07-15
申请号：JP32390290
申请日：1990-11-26
申请人： TEAC CORP , MITSUBISHI ELECTRIC CORP
发明人： MASHITA TSUGUAKI , ONDA HIROYUKI , NAGATA TAKUYA , YOSHIMOTO KYOSUKE , NAKAJIMA YOSHIKI , ITO OSAMU
IPC分类号： G11B7/085 , G11B7/095
摘要： PURPOSE:To improve the reliability of a focus servo circuit by comparing a measured sum signal level and a predetermined level of a total signal measured theretofore and by forbidding a focus servo operation, when the former level is lower than the predetermined level. CONSTITUTION:An apparatus is equipped with a means 25 for periodically measuring the total signal Y-level of the output of a plurality of light detectors 9 for receiving a reflected light from an optical disc 6 and with a means SW1 for forbidding a control operation performing control so that focusing of light projected on the optical disc 6 is obtained. Also, the apparatus is constituted to forbid the control operation for obtaining focusing when the level of the measured sum signal Y is lower than the predetermined level of a total signal measured theretofore. In this manner, even if the light reflectance of the optical disc 6 varies or the light intensity of light beam projected on the optical disc 6 varies, a focus servo deviation signal can be obtained to sharply improve the reliability of the optical disc drive.

7. 发明专利

JPH0491685A MOTOR CONTROLLER 失效
公开(公告)号：JPH0491685A
公开(公告)日：1992-03-25
申请号：JP20786490
申请日：1990-08-06
申请人： MITSUBISHI ELECTRIC CORP , TEAC CORP
发明人： HYO HIROO , MASHITA TSUGUAKI , ONDA HIROYUKI , ENAMI KATSUYA , TAKAHASHI HIROSHI
IPC分类号： H02P1/16
摘要： PURPOSE:To bring revolution instantaneously to the state of stoppage, and to stop a motor in a short time by braking and briving a winding in the direction of reverse rotation up to the time of reverse rotation in response to the number of revolution of the motor. CONSTITUTION:The width of the output pulses of a monostable multivibrator 15 is broadened at the beginning of a stoppage command, and reduced with the lowering of the rotation of a motor 2. When an output from a comparator 14 is used as the trigger of the monostable multivibrator 15 in place of a reference pulse oscillator 19, the frequency of output pulses is also decreased with the lowering of the rotation of the motor 2, and the width of output pulses is also narrowed. A rotational direction detector 4 discriminates the direction of rotation by the phase difference of FGl and FG2, an inversion signal is input to a controller 16 when the direction of rotation is reversed, the controller 16 receives the signal and inputs a motor OFF signal to a driver 10, and the motor 2 is stopped instantaneously.

8. 发明专利

JPH11134663A OPTICAL DISK DEVICE 失效
公开(公告)号：JPH11134663A
公开(公告)日：1999-05-21
申请号：JP25010398
申请日：1998-09-03
申请人： TEAC CORP
发明人： MASHITA TSUGUAKI , ONDA HIROYUKI , NAGATA TAKUYA , MURATA HIDEHIKO , YOSHIMOTO KYOSUKE , KOYANAGI KIMIYUKI , FURUKAWA TERUO
IPC分类号： G11B7/09
摘要： PROBLEM TO BE SOLVED: To correctly control the irradiating state of a light beam by controlling the irradiating state of the light beam while reading out stored controller variables every time a temp. detection result reaches a prescribed temp. range or a temp. change reaches a prescribed value to make a storage capacity small. SOLUTION: When command signals to be applied to the driving circuits 13, 14 of a linear motor IC and an electromagnetic actuator 1d are not generated for a prescribed time a control circuit 8 judges that the recording and reproducing of information is not present and it reads out respective values of stored offsets and gains till then from a memory 15. Then, it sets these offset values and gain values every prescribed temp. range or every time the temp. change reaches a prescribed temp. to preliminarily store them in the memory 15 and it reads out an offset value and an gain value corresponding to a detected temp. at the time of changing an offset and an gain to change them. Then, when an ambient temp. is changed, the circuit 8 is changed to controlled variables related to its ambient temps. and the light beam is subjected to a tracking control and, then, the proper tracking control of the light beam is performed without being affected by the change in ambient temps.

9. 发明专利

JPH06282972A DISK RECORDING/REPRODUCING DEVICE 失效
公开(公告)号：JPH06282972A
公开(公告)日：1994-10-07
申请号：JP6851593
申请日：1993-03-26
申请人： TEAC CORP
发明人： ONDA HIROYUKI
IPC分类号： G11B11/10 , G11B11/105 , G11B27/36
摘要： PURPOSE:To shorten accessing time and rotation standby time and to speed up the operation of recording data in a disk recording/reproducing device for a disk whose tracs are formed spirally. CONSTITUTION:When new data is recorded on an optical magnetic disk 11, a data quantity equivalent to the accessing time of an optical head 26 during moving among erasing, recording and confirming conditions are set into a host computer 22 as a subtraction data quantity. Then, this subtraction data quantity, that is, a capacity subtracted from a storage capacity owned by a memory 24 is made to a maximum data quantity to be stored and data from the host computer 22 is fetched into the memory 24 by a control section 23.

10. 发明专利

JPH0611114B2 失效
公开(公告)号：JPH0611114B2
公开(公告)日：1994-02-09
申请号：JP27769284
申请日：1984-12-31
申请人： TEAC CORP
发明人： ARAKI TETSUAKI , ONDA HIROYUKI
IPC分类号： H03M1/08 , H03M1/00 , H03M1/20

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式