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    • 8. 发明专利
    • OPTICAL DISK SYSTEM
    • JP2000285636A
    • 2000-10-13
    • JP9368399
    • 1999-03-31
    • HITACHI MAXELL
    • YUSA ATSUSHIYASUI TOSHIAKITANAKA YOSHITOINOSE FUMIYUKIKAWAMURA TETSUSHI
    • G06K19/07G11B7/24G11B23/30
    • PROBLEM TO BE SOLVED: To enable non-contact storage/write/read to be performed on an optical disk by arranging an electronic circuit on the disk and communicating with the electronic circuit in the main body of the disk by providing a corresponding electromagnetic coupling coil at a position facing the optical pickup head of a drive device. SOLUTION: An electromagnetic coil 301 is provided on the drive side while facing a semiconductor chip 101 built in a main body 100 of disk. Even while the main body 100 of disk is rotated, communications between the semiconductor chip 101 and the electromagnetic coil 301 are secured for a half cycle. When reading information of an electronic circuit 305, the rotation of the main body 100 of optical disk is controlled into low speed and time for information exchange can be easily secured as well. The read only signal of the main body 100 of optical disk can be utilized from the optical pickup 210 and the signal of a semiconductor memory can be utilized through an electromagnetic coil 304, a second electromagnetic coil 303, the electromagnetic coil 301 and a coil formed on the surface of the semiconductor chip 101 by the electronic circuit 305 respectively.
    • 9. 发明专利
    • TEMPERATURE RECORDING DEVICE
    • JP2000258254A
    • 2000-09-22
    • JP6424999
    • 1999-03-11
    • HITACHI MAXELL
    • INOSE FUMIYUKIKAWAMURA TETSUSHI
    • G06K19/07G01K1/02G06K19/00
    • PROBLEM TO BE SOLVED: To provide a simple and convenient temperature control means to record a temperature relative to an object to be controlled by storing the change with elapse of the time of temperature digitally in a semiconductor chip and reading it out through a coil as required. SOLUTION: This temperature control device 100 comprises a semiconductor chip 101, a lithium coin battery 102 connected therewith, a thermistor 103 for measuring temperature, a high-frequency coil 104, and a crystal oscillator 105. The output temperature signal from the thermistor 103 is converted into a digital information, and it is stored in a memory. The recording interval of temperature is set by an external instruction. When the information is read out, a modulated high-frequency signal is oscillated by an external reader-writer. The coil 104 is induced by the oscillation, and the information is read out from the memory, modulated at high frequency to be transmitted to the outside. Such the device can be applied to various fields such as physical distribution management for cold chain, etc., measurement of temperature of ocean or river, measurement of body temperature, separate temperature control in refrigerating warehouse, control of freshness of foods, etc.