Resources Contact Us Home
Method and apparatus for erasing and recording information using three power levels

Image Number 4 for United States Patent #4939717.

In a single beam overwrite method, wherein optical recording medium having thin recording film capable of reversible change of phase by irradiating different level laser lights, etc., the laser light is modulated to have three energy levels, i.e., a recording power level, an erasing power level and a very short time of cooling power level which is provided immediately after the recording power level.

  Recently Added Patents
Switching module and switching synchronization system
Liquid crystal panel and liquid crystal display
Selecting from a plural of energy saving modes
Extensible framework for client-based active network measurement
Methods and compositions related to glucocorticoid receptor antagonists and breast cancer
Microcapsules, their use and processes for their manufacture
  Randomly Featured Patents
System and method for providing managed remote monitoring services
Scan driving apparatus, flat panel display having the same, and driving method thereof
Organotin miticidal and insecticial compounds
Data processing device having event in non-windows desktop environment affecting window in desktop environment
Method for forming three dimensional processor using transferred thin film circuits
Radial balancing means for a hydraulic device
Endoscopic surgical instrument
Test device for detecting analytes in biological samples
Belt conveyor
Load balancing according to an iterative greatest common divisor approach to weight normalization