NOVEL POSITION SENSITIVE DETECTOR HEADS FOR OPTICAL DATA RECORDING

抄録

  A proposal for a novel detection system is presented for the readout of a ROM optical disc. The sytem has been developed for fast access by reducing the mass of the moving head to that of a lens array used for both focus and tracking. The detection system uses a position sensitive detector array specifically developed for this application. The fabrication of tile devices is described and the linearity plots of two types of devices are given. Results of current devices show an almost 100% linearity for p-type devices with zero cross-talk between channels. However, the n-type devices show approximately 70% linearity with very poor crosstalk. It is expected that alternative n-type devices using 100 micron trenching and wafer bonding will eliminate crosstalk making these devices a viable proposition for detection methods.