G - Physics – 11 – C
Patent
G - Physics
11
C
314/3, 18/99, 35
G11C 13/04 (2006.01) B41M 5/36 (2006.01) G11B 7/00 (2006.01) G11B 7/0045 (2006.01) G11B 7/12 (2006.01) G11B 7/244 (2006.01)
Patent
CA 1193008
Abstract of the Disclosure Information-recording process in which heating e.g. using a pulsed laser, produces recording marks in the form of areas of surface relief on the surface of a recording medium. The medium is selectively producible in different density states by cooling it at a selected cooling rate from the molten state, and can be switched between said states by controlled exposure to the heating, thus permitting repeated recording and erasing on the medium. This permits very small marks of less than 1 micron diameter to be produced using a diffraction-limited spot of light, and as surface relief of high aspect ratio can be obtained at low power levels, it is possible to achieve high packing densities and high signal to noise ratio at low energy costs.
347520
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