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The TrueX™ Technology White Paper

Introduction | Optical drive trends | CD & DVD markets | Intro to TrueX
Parallel Processing ASIC | Features & Benefits

The Zen TrueX™ Advantage

Zen's advantage is gained through reading multiple tracks simultaneously, and by processing the data through a custom ASIC. To understand how this works, it is important to understand the following three areas of Zen TrueX technology:

  • Multiple Beam Illumination - Reads multiple tracks on media concurrently
  • Broad Beam Illumination - Reads a wider area on media concurrently
  • Parallel Processing ASIC - Integrated signal processor and error correction on a single circuit

Multiple Beam Illumination

How it Works

The Multiple Beam approach to illuminating and detecting multiple tracks uses a diffracted laser beam in conjunction with a multiple beam detector array. A conventional laser diode is sent through a diffraction grating which splits the beam into seven discrete beams, spaced evenly to illuminate seven tracks. The seven beams pass through a beam splitting mirror to the objective lens and onto the surface of the disc. Focus and tracking are accomplished with the central beam. Three beams on either side of the center are readable by a detector array as long as the center is on track and in focus.

The reflected beams return via the same path and are directed to the multiple beam detector array by the beam splitter mirror. The detector contains seven discrete detectors spaced to align with seven reflected tracks. Conventional detectors are also provided for focus and tracking.

This design uses a conventional approach to tracking and seeks. Performance is far greater than that of conventional drives while maintaining lower, more disc tolerant rotational speeds.

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