| 摘要 |
PURPOSE: A device of controlling a track servo for a holographic ROM system is provided to supply a track servo control function by using a slit consisting of three holes and a photo detector, thereby improving a data reproduction efficiency of a holographic ROM system. CONSTITUTION: A slit(120) is moved by an actuator(160), and consists of three holes where a reproduced signal light can be transmitted. A 3-division photo detector(130) includes 3 light receiving elements(A-C) installed by corresponding to each hole of the slit(120), and wherein each of the light receiving elements(A-C) receives the reproduced signal light to generate reproduction signals. A slit controller(150) drives the actuator(160) when a reproduction signal is produced from one of the light receiving elements(A-C), moves the slit(120), and fixes the slit(120) to perform a track servo control process.
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