| 摘要 |
Light emitted from alight source ( 5 ) is reflected by the reflection film of a polarized beam-splitter ( 6 ), passes through collimating lens ( 7 ) and a mirror ( 8 ) to reach a convergence lens ( 9 ). The convergence lens ( 9 ) forms a light spot on an information medium ( 1 ) having a visual information layer ( 4 ). Reflected light which is reflected by the visual information layer ( 4 ) passes through the convergence lens ( 9 ), the mirror ( 8 ), and the collimating lens ( 7 ), transmits through the reflection film of the polarized beam-splitter ( 6 ), passes through a half mirror ( 14 ) to reach a second light detector ( 13 ). The second light detector ( 13 ) detects an FE signal for the visual information layer ( 4 ) and feeds back the detected signal to an LPC circuit, thereby restricting power fluctuation due to surface deflection.
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