×

Wavelength selective optical recording and reproducing method

  • US 5,231,626 A
  • Filed: 03/26/1992
  • Issued: 07/27/1993
  • Est. Priority Date: 06/12/1987
  • Status: Expired due to Fees
First Claim
Patent Images

1. A method of optically recording and reproducing desired information by condensing a light beam from a wavelength variable light source on a plurality of recording track sections of a recording medium capable of being wavelength-selectively recorded and reproduced at any of a predetermined number of wavelengths, said track sections being arranged as spiral track sections on said recording medium, the wavelength of said light beam being varied by an external control signal, comprising the steps of:

  • a step of recording or reproducing information at only a first predetermined wavelength such that the recorded or reproduced information corresponds to more than one bit length but not more than one track section length of said recording medium;

    switching said first predetermined wavelength to another predetermined wavelength by said external control signal after recording or reproducing information at the first predetermined wavelength;

    a step of recording or reproducing information at only said another predetermined wavelength which is different from the first predetermined wavelength such that the recorded or reproduced information corresponds to more than one bit length but not more than one track section length of said recording medium; and

    continue switching the wavelength of said light beam to other predetermined wavelengths not previously used, and recording or reproducing information at said other wavelengths such that the recorded or reproduced information at each of said other wavelengths corresponds to more than one bit length but not more than one track section length of said recording medium until the desired information is recorded on or reproduced from the recording medium.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×