| 摘要 |
A multi-layered optical disk reading method which reproduces encoded data from each data layer by focusing a laser beam precisely onto the data layer of the multi-layered optical disk. After a multi-layered optical disk is loaded, a central processing unit (CPU) receives an operator's signal to access a certain data layer. Then the CPU refers to stored data in the CPU's memory for diffraction angle to focus the laser beam onto the certain data layer. The CPU retrieves an operational coded signal, and transmits the signal to a liquid crystal diffraction device to modulate the liquid crystal diffraction device to deflect and focus the laser beam onto the certain data layer. After the liquid crystal diffraction device is modulated by the operational signal from the CPU, the CPU also operates a routing circuit to transmit a read-out signal from a detector which receives a reflected laser beam from the certain data layer, to a selected decoding circuit in a data processor.
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