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71. 发明专利

JPH0587887B2 失效
公开(公告)号：JPH0587887B2
公开(公告)日：1993-12-20
申请号：JP1121085
申请日：1985-01-24
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： ISHIOKA KYOSHI , OONISHI MASANORI , ISHIKAWA KAZUO , SAKAI KOICHI , IKENAGA TAKEO
IPC分类号： G11B5/54 , G11B5/17 , G11B5/55

72. 发明专利

JPH0540980A TAPE TRAILING END DETECTOR 失效
公开(公告)号：JPH0540980A
公开(公告)日：1993-02-19
申请号：JP19640491
申请日：1991-08-06
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： SAKAI KOICHI
IPC分类号： G11B15/08
摘要： PURPOSE:To detect the tape trailing ends of both cassettes in a tape recorder capable of using both a digital compact cassette and an analog compact cassette. CONSTITUTION:The projector 5 and the light receiver 6 of an optical sensor are buried in a columnar body 4 inserted into the reference hold 12 of the internal one of two reference holes provided on a cassette main body, in the case of a DCC, a light emitted from the projector 5 is reflected by a light reflection layer formed on the surface in the vicinity of the connecting part of a reader tape part of the connecting part between the reader tape and a magnetic tape, a reflected light is received by the light receiver 6, the operation of the optical sensor is activated and the trailing end of a tape 3 is detected. In the case of an ACC, since the light is transmitted through the reader tape part, a light emitted from the projector 5 is transmitted through the reader tape part, reflected by a reflector 7, the reflected light is transmitted through the reader tape again and received by the receiver 6, the optical sensor is activated to detect the trailing end of the tape 3.

73. 发明专利

JPH01317267A REPRODUCING DEVICE FOR DATA RECORDING DISK 失效
公开(公告)号：JPH01317267A
公开(公告)日：1989-12-21
申请号：JP14855888
申请日：1988-06-16
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： WATANABE KAORU , SHIRAHAMA JUN , NAKAYAMA REI , SAKAI KOICHI , TANAKA SHIN , ASANUMA MASAMI
IPC分类号： G11B17/04 , G11B17/051
摘要： PURPOSE:To realize the common use of disks having different outer diameters by securing the common use between a drive source for reciprocating motions of a pickup unit and a drive source for front-back movements of a disk positioning member respectively. CONSTITUTION:A pickup unit has the reciprocating motions at reproduction and therefore a drive source 51 does not work in other periods of time. Thus the disk positioning members 26-28 are moved back and forth by the source 51 in said idle periods of time. The members 26-28 are usually moved back. Thus a loaded disk of a large diameter is guided with the members 26-28 kept at their retreated positions and then loaded at a reproduction positions. While a disk of a small diameter is loaded. In this case, the source 51 works to move forward the members 26-28 and the disk is guided by the members 26-28 to be loaded at the reproduction position, i.e., the same rotational center. Thus a loaded disk of a large or small diameter can be position. Then it is possible to obtain a reproducing device that can be used in common to the disks of different outer diameters.

74. 发明专利

JPS6311878B2 失效
公开(公告)号：JPS6311878B2
公开(公告)日：1988-03-16
申请号：JP15158581
申请日：1981-09-24
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： NAKANO HIROMITSU , SAKAI KOICHI , HAMANAKA HIROSHI , MURAYAMA AKIRA
IPC分类号： H02P7/288 , H02P7/285

75. 发明专利

JPS633383B2 失效
公开(公告)号：JPS633383B2
公开(公告)日：1988-01-23
申请号：JP8192580
申请日：1980-06-16
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： SAKAI KOICHI
IPC分类号： G11B15/093

76. 发明专利

JPS6032895B2 失效
公开(公告)号：JPS6032895B2
公开(公告)日：1985-07-31
申请号：JP10456579
申请日：1979-08-16
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： SAKAI KOICHI
IPC分类号： G11B15/087 , G11B15/02 , G11B15/10

77. 发明专利

JPS5931139B2 JPS5931139B2 - 失效
公开(公告)号：JPS5931139B2
公开(公告)日：1984-07-31
申请号：JP12316578
申请日：1978-10-05
申请人： Matsushita Electric Ind Co Ltd
发明人： SAKAI KOICHI
IPC分类号： G11B15/03 , G11B15/02

78. 发明专利

JPS5916341B2 JPS5916341B2 - 失效
公开(公告)号：JPS5916341B2
公开(公告)日：1984-04-14
申请号：JP12239478
申请日：1978-10-03
申请人： Matsushita Electric Ind Co Ltd
发明人： SAKAI KOICHI
IPC分类号： G11B15/03 , G11B15/02

79. 发明专利

JPS5841579B2 失效
公开(公告)号：JPS5841579B2
公开(公告)日：1983-09-13
申请号：JP12238878
申请日：1978-10-03
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： SAKAI KOICHI
IPC分类号： G11B15/03 , G11B15/02 , G11B27/17

80. 发明专利

JP2003134873A MOTOR DRIVE APPARATUS 审中-公开
公开(公告)号：JP2003134873A
公开(公告)日：2003-05-09
申请号：JP2001326277
申请日：2001-10-24
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： SHIMURA KAZUHIRO , SAKAI KOICHI
IPC分类号： H02P6/08 , H02P6/06 , H02P6/28
摘要： PROBLEM TO BE SOLVED: To provide a bridge drive circuit which drives an inductive load and is provided in a motor drive apparatus for driving a portable disc medium at a high speed, with low power consumption. SOLUTION: This motor drive apparatus has motor windings, output transistors which are connected with source sides and sinks whose one side ends are connected to the motor windings, a current-detecting resistor for detecting a current applied to the windings, a comparator for comparing the voltage between both the ends of the current detection resistor with an input signal, a clock signal generator for generating a clock signal by which the switching frequency of PWM control is determined, a flip-flop circuit which is made to operate by the output of the comparator and the clock signal, a PWM control circuit which makes the output transistors electrically continuous/ discontinuous according to the set/reset signals of the flip-flop circuit, and a current application control circuit determining a phase, to which the current is applied. As a result of such a constitution, a motor current corresponding to the input signal can be obtained.

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