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Optical recording disc

Image Number 4 for United States Patent #4891800.

An optical recording disc provided with a substrate permeable to a red laser beam for reading data recorded and having a single pass transmissivity of 85% or more in a wave length region of said laser beam and a light absorption edge of shorter wave length side positioned at 600 nm or more and capable of preventing a misregeneration due to an external light having been incident upon an optical system without reducing the regenerating performance.

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