A volumetric optical disk having multiple transparent films with optical switching layers is proposed as a recordable medium to increase the number of recording layers. In the disk, an optical switching layer is adopted to reduce laser energy decay and increase recording sensitivity for reading and recording, respectively. A well-defined deformation area (mark) with submicron to nanometric dimensions can be yielded precisely on the transparent films by a focused laser beam. The peak writing power of 7 mW for a four-layer recordable medium, fabricated by molding and spin bonding techniques, was demonstrated experimentally as an example. The proposed volumetric disk can achieve a higher recording capacity by using conventional optical pickup units.
A volumetric optical disk that has multiple transparent films with optical switching layers is used as a recording medium to increase the number of recording layers. In the disk the optical switching layer is adapted to reduce decay of laser energy and increase reading and recording sensitivity. Well-defined marks of approximately 100-nm depth can be placed precisely on the transparent films by a focused laser beam. Writing and reading of a four-layer recordable disk, fabricated by molding and spin bonding, have been demonstrated experimentally. The volumetric disk can achieve a high recording capacity with conventional optical pickups.
Photoinduced Discharge Curve (PIDC) , which represents the photoconductor surface potential as a ftrnction of the input exposure, is a critical parameter in xerographic processes. In general, the PJDC defines a suitable exposure energy to achieve the surface potential of photoconductor for different operating conditions. In order to reach the same surface potential, one can increase the exposure energy or to increase the incident light of flux. Two experimental methods were used to measure the PIDC of organic photoconductor drum. One method is to fix the exposure spot size and changed exposure energy. Another method is to fix the flux of incident light by changing spot size and exposure energy.The light flux in our experiment was set in the range of iO' '.-iO photons/cm2*sec. The surface potential of OPC drum can be discharged to the values below -bOy when the exposure energy is in the range of 1-lOpJ/cm2. O-8194-1466-2/94/$6.OO SPIE Vol. 2171 / 141 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/27/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx
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