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Applied Optics

Applied Optics


  • Vol. 27, Iss. 22 — Nov. 15, 1988
  • pp: 4615–4619

Video high-density disk surface testing with a laser diode and a position sensor

Akira Ono, Kenji Sasaki, and Tadanori Komatsu  »View Author Affiliations

Applied Optics, Vol. 27, Issue 22, pp. 4615-4619 (1988)

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A surface tester was developed for the VHD (video high-density disk) using an optical technique. A 10-μm diam beam from a laser diode irradiates the disk surface, and a photosensor detects the angle and the intensity of a reflected beam. Defects on the surface are found by observing changes in the photosensor signal. A microscopic examination of the disk surface revealed that the tester can detect defects larger than 10 μm. The tester classifies defects by their category and size and displays a defect map on a monitor screen. The data obtained are utilized for improving the VHD manufacturing process.

© 1988 Optical Society of America

Original Manuscript: March 19, 1988
Published: November 15, 1988

Akira Ono, Kenji Sasaki, and Tadanori Komatsu, "Video high-density disk surface testing with a laser diode and a position sensor," Appl. Opt. 27, 4615-4619 (1988)

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