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

Image Number 2 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
Electric washing machine
Biodegradable aliphatic-aromatic copolyester for use in nonwoven webs
Method of stimulating tissue healing
Myoglobin blooming agents, films, packages and methods for packaging
Systems and methods for generating a hybrid text string from two or more text strings generated by multiple automated speech recognition systems
Pressure-sensitive adhesive composition for optical films, pressure-sensitive adhesive optical film and image display
Methods and apparatus for power amplifier calibration
  Randomly Featured Patents
Emulsion coated dental floss containing chemotherapeutic active agents
Coolable nozzle and method for producing such a nozzle for a rocket engine
Connection system for interconnecting a heat exchanger and a pipe union
Spring strut with steering knuckle
Curtain airbag device and method of manufacturing the same
Magnetic emissions reduction apparatus and method
Single unit phone card assembly and method of producing same
Method and device for acquiring signals in laser scanning microscopy
Controlling program and image forming apparatus
Low cost fabrication of double box back gate silicon-on-insulator wafers with built-in shallow trench isolation in back gate layer