The LaserDynamics Patent

LaserDynamics, LLC owns two U.S. Patents:

  • U.S. Patent No. 5,587,981, “Multi-Standard Optical disk Reading Method Having Distinction Process,” was filed on September 5, 1995 and was published December 24, 1996. This patent relates to an optical disk reading method to provide an optical disk reading system which is able to reproduce encoded optical data from varied optical disk format fabricated in accordance with different standard. Before start reproducing data on an optical disk, a set of standard data which includes data of total number of data layer, pit density and track pitch is identified by reading a total of contents data encoded in a reading region of the optical disk. If the total of contents data is not encoded on the optical disk, any encoded pits on the optical disk is processed until the standard of the optical disk is identified. After the standard of the optical disk is identified, modulation of each servo circuit such as a focusing lens servo circuit and a tracking servo circuit is settled to start reproducing data on the optical disk. For a .pdf of the patent, click here.
  • U.S. Patent No. 5,959,280, “Multi-Standard Optical Disk Reading Apparatus and Method of Reading Using Same, was filed on January 16, 1997 and was published September 28,1999. This patent covers an optical disk reading apparatus and method to provide an optical disk reading system which is able to reproduce encoded optical data from varied optical disk formats fabricated in accordance with different standards. After loading an optical disk, a sensing device detects the total number of data layers, diameter or thickness, to identify the standard of the optical disk. The standard or type of an optical disk can be identified by detecting an identification mark, if the optical disk has one. A central processing unit (CPU) distinguishes the standard by referring the detected signal to stored data about the standard of various optical disk formats. In order to reproduce encoded data on the loaded optical disk, the CPU modulates the servo control circuit to set up the movement of the servo mechanisms according to the identified standard of the optical disk. Also the CPU operates the data processor to select an appropriate data encoding circuit in the data processor, according to the standard of the optical disk. After the initial set-up of the servo mechanisms and the data processor is determined, the data reproduction is started. For a .pdf of the patent, click here.