Information recording medium
专利汇可以提供Information recording medium专利检索，专利查询，专利分析的服务。并且PURPOSE:To prevent photosensitive recording material from being affected by the change in its coating film thickness by making use of light of two or more wavelengths in and out of photosensitive recording region. CONSTITUTION:A recording luminous flux 3 being He-Cd laser light of a wavelength 4416 Angstrom having been intensity-modulated by recording signals is condensed by way of an objective lens 2 of N.A 0.5, focal depth about 2mum onto an information recording medium 1 which comprises evaporating Cr on a substrate and further coating resist thereon. The medium 1 has a high transmittance to the light of this wavelength. An auxiliary luminous flux 4 being He-Ne laser light of a wavelength 6328 Angstrom outside the photosensitive region is entered via auxiliary lens 5 diagonally to the optical axis of the lens 2 and the reflected light thereof enters at equal quantity to photoelectric transducers 6, 7 when the distance between the lens 2 and the object 1 is equal to the focal length of the lens 2. When the medium 1 moves in (a) and (b) directions, the output difference of the elements 6, 7 is detected with a circuit 8 and a voice coil 10 is driven by way of a control circuit 9, whereby the distance between both is maintained at the focal length of the lens 2.，下面是Information recording medium专利的具体信息内容。
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