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公开(公告)号：EP0206244A2
公开(公告)日：1986-12-30
申请号：EP86108319
申请日：1986-06-19
申请人： HITACHI MAXELL
IPC分类号： G11B5/708 , C09D5/23 , C09D7/12 , C10M105/32 , C10M171/00 , C10N40/18 , G11B5/71
CPC分类号： G11B5/71 , Y10S428/90
摘要： A magnetic disc comprising a non-magnetic supporting substrate and a magnetic layer consisting of a magnetic coating which is formed on at least one surface of the substrate and comprises ferromagnetic powder, a binder, an aliphatic acid ester having a melting point not higher than 10°C and an aliphatic acid ester having a melting point of 15 to 60°C, the magnetic coating of which has improved lubricity and durability.
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公开(公告)号：EP2894755A4
公开(公告)日：2016-07-06
申请号：EP13833654
申请日：2013-08-22
申请人： HITACHI MAXELL
发明人： HINO YOSHIHARU , MIYAKE AKIRA
摘要： A contactless charging system includes: a power transmission module (1) having a power transmission coil (2); and a power receiving module (3) having a power receiving coil (4) that receives power through electromagnetic induction and a secondary battery (12) charged with received power. The power receiving module includes a switching control section (13, 15) that performs switching between a power shutdown state where power supply from the secondary battery is stopped and a power supply state where power supply is permitted, and a carrier detection circuit (14) that generates a SW signal the ON/OFF of which is switched according to the presence or absence of a power receiving carrier of high-frequency power in the power receiving coil. The switching control section controls the switching to the power shutdown state when the SW signal indicates the presence of the power receiving carrier, and to the power supply state when it indicates the absence of the power receiving carrier. Since switching is made between the power shutdown state and the power supply state according to the loaded state of the power receiving module on the power transmission module, an occurrence of permitting discharge in an unused state of the set device is avoided.
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公开(公告)号：EP2894756A4
公开(公告)日：2016-05-18
申请号：EP13834672
申请日：2013-08-22
申请人： HITACHI MAXELL
发明人： HINO YOSHIHARU , MIYAKE AKIRA
摘要： A non-contact charging system includes: a power transmission module (1) having a power transmission coil (2); and a power receiving module (3) having a power receiving coil (4) that receives power through electromagnetic induction and a built-in secondary battery (13) charged with DC power obtained by rectifying the received power, the power receiving module including a protection circuit (17) that prevents overdischarge of the secondary battery. The power receiving module includes a switching control section (13, 15) that performs switching between a storage mode where power supply from the secondary battery to all power supply portions including the protection circuit is shut off and a use mode where power supply is permitted, and a loading responsive section (11) that outputs a loading responsive signal when the power receiving module is loaded in a predetermined power receiving position. The switching control section is set to maintain the storage mode in the initial state, and switches the mode to the use mode and maintains the mode in response to output of the loading responsive signal. Power supply is entirely stopped in the initial state of a set device including the power receiving module, and permitted according to the state of use of the set device.
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公开(公告)号：EP2985851A4
公开(公告)日：2016-11-23
申请号：EP13878440
申请日：2013-11-19
申请人： HITACHI MAXELL
发明人： HINO YOSHIHARU , MIYAKE AKIRA
CPC分类号： H01M10/48 , G01R31/3606 , H01M10/425 , H01M10/44 , H01M2010/4271 , H02J5/005 , H02J7/0047 , H02J7/025 , H02J50/12 , H02J50/80 , H02J2007/005
摘要： A wireless charging module includes: a power receiver (2) having a power receiving resonant circuit (4) composed of a power receiving coil and a resonant capacitor; and a rechargeable battery (5) to which output power of the power receiver is supplied. A rectification circuit (20) converts, to DC power, AC power generated in the power receiving resonant circuit through electromagnetic induction between a power transmitting coil of a power transmitter (1) and the power receiving coil, so as to charge the rechargeable battery. The wireless charging module further includes: a capacity detection circuit (24) for detecting a remaining capacity of the rechargeable battery; and a power reception controller (25) for controlling an operation of the capacity detection circuit. The power reception controller can operate the capacity detection circuit with switching between a high-accuracy measurement mode and a low-accuracy measurement mode, the high-accuracy measurement mode detecting the remaining capacity with high accuracy, and the low-accuracy measurement mode detecting the remaining capacity with accuracy lower than that of the high-accuracy measurement mode. The capacity detection circuit is operated in the high-accuracy measurement mode in charging of the rechargeable battery and the low-accuracy measurement mode in discharging of the rechargeable battery. Thus, the remaining capacity of the rechargeable battery can be detected effectively in a power saving manner.
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