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ANTI-REFLECTION COATING, OPTICAL MEMBER, EXCHANGE LENS UNIT AND IMAGING DEVICE

  • US 20090168184A1
  • Filed: 12/23/2008
  • Published: 07/02/2009
  • Est. Priority Date: 12/27/2007
  • Status: Active Grant
First Claim
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1. An anti-reflection coating comprising first to seventh layers formed on a substrate in this order, said first layer being an alumina-based layer, said seventh layer being a porous, silica-based layer, and in a wavelength range of 400-700 nm,said substrate having a refractive index of 1.60-1.95,said first layer having an optical thickness of 37.5-112.5 nm,said second layer having a refractive index of 1.95-2.25 and an optical thickness of 35.5-60.0 nm,said third layer having a refractive index of 1.35-1.50 and an optical thickness of 24.5-41.5 nm,said fourth layer having a refractive index of 1.95-2.25 and an optical thickness of 210.5-250.0 nm,said fifth layer having a refractive index of 1.35-1.50 and an optical thickness of 12.5-32.5 nm,said sixth layer having a refractive index of 1.95-2.25 and an optical thickness of 27.5-45.0 nm, andsaid seventh layer having an optical thickness of 108.0-138.0 nm.

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