Patent ID: 6903853
Filing Date: 2005-06-07
Classification: G03H,G11B

Abstract:
1. An optical head comprising: an integrated unit for recording and reproducing page data on a reflective holographic recording medium; wherein the integrated unit has recording and reproducing units each corresponding to a bit of the page data, each of the recording and reproducing units including a light emitter for emitting an object beam and a reference beam used for recording and reproducing the bit, an optical switch for transmitting or blocking the object beam, and a detector for detecting the reference beam that has passed through a hologram formed on the holographic recording medium, each of recording and reproducing units record a bit of the page data corresponding to a state indicating whether or not a hologram has been formed by the object beam passing through or being blocked at the optical switch and reproduces a bit of the data corresponding to a state indicating whether or not a reference beam has been detected by the detector when the object beam is blocked by the optical switch and the reference beam is emitted to the recording position, and the integrated unit records the page data on the holographic recording medium by recording the bit on the holographic recording medium by each of the recording and reproducing units.