Invention Grant
- Patent Title: Anti-reflection coating, optical member, exchange lens unit and imaging device
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Application No.: US12392297Application Date: 2009-02-25
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Publication No.: US08125714B2Publication Date: 2012-02-28
- Inventor: Kazuhiro Yamada , Hiroyuki Nakayama , Mineta Suzuki
- Applicant: Kazuhiro Yamada , Hiroyuki Nakayama , Mineta Suzuki
- Applicant Address: JP Tokyo
- Assignee: Pentax Ricoh Imaging Company, Ltd.
- Current Assignee: Pentax Ricoh Imaging Company, Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Greenblum & Bernstein, PLC
- Priority: JP2008-047421 20080228
- Main IPC: G02B1/10
- IPC: G02B1/10
Abstract:
An anti-reflection coating comprising first to seventh layers formed on a substrate in this order, the first layer being an alumina-based layer, the seventh layer being a porous, silica-based layer, and each of the first to seventh layers having predetermined refractive index and optical thickness in a wavelength range of 400-700 nm.
Public/Granted literature
- US20090219620A1 ANTI-REFLECTION COATING, OPTICAL MEMBER, EXCHANGE LENS UNIT AND IMAGING DEVICE Public/Granted day:2009-09-03
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