Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal
Patent
1991-05-23
1993-08-17
Psitos, Aristotelis
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Mechanism control by the control signal
369 54, G11B 509, G11B 2010
Patent
active
052375501
ABSTRACT:
A reloadable optical recording/reproducing apparatus for reloading data continuously from a recording area of a recording medium, onto which data has been recorded at the preceding recording operation, in accordance with the same modulating rule, the reloadable optical recording/reproducing apparatus comprising: a VFO circuit in which a reading VFO signal is obtained from a read signal obtained from a fact that an optical head scans an optical card; a demodulating circuit for demodulating the read signal and outputting demodulated data; a terminal recognizing device for detecting a synchronizing pattern of the terminal of the recording area, onto which data has been recorded at the preceding recording operation, from the demodulated data and outputting a terminal signal; a delay compensating device for proceeding the phase of the reading VFO signal at the timing defined in accordance with the terminal signal so as to output it as a writing VFO signal; a modulating device for modulating data to be reloaded in accordance with the writing VFO signal; and a laser diode drive circuit for performing reloading by driving the optical head in accordance with the output from the modulating circuit.
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"DELA Standard Optical Memory Cards and Devices, Part 4--Logical Data Structures", Drexler European Licensees Association Standard (DELA), Part 4--Rev. D, pp. 5-27.
Nakajima Yoshio
Shirai Akira
Olympus Optical Co,. Ltd.
Psitos Aristotelis
Tran Thang V.
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