OPTICAL LOW-PASS FILTER AND DIGITAL CAMERA

WIPO Patent Application WO/2011/105581

A1

Disclosed are an optical low-pass filter and a digital camera capable of switching between two or more desired separation distances for separating incident light without a mechanical mechanism. Specifically disclosed is an optical low-pass filter which comprises a first separating element (11) and a second separating element (12) that separate incident light into a first polarized beam and a second polarized beam orthogonal to the first polarized beam, that have the same separation direction, and that have separation distances differing from each other; and a polarization control unit (20) disposed between the separating elements so as to change the polarization state of the incident light or to allow passage of the incident light therethrough without changing the polarization state by adjusting the amplitude of voltage to be applied by a voltage control unit (13). Since the first separating element (11) has a separation distance L1 and the second separating element (12) has a separation distance L2, two separation distances of L1 + L2 and |L1 - L2| can be obtained using the voltage of the voltage control unit (13). When the optical low-pass filter is applied to a digital camera, moiré fringes or false colors that occur in still images and moving images can be appropriately reduced.

KOYANAGI ATSUSHI (JP)

PCT/JP2011/054392

September 01, 2011

February 25, 2011

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ASAHI GLASS CO LTD (JP)
KOYANAGI ATSUSHI (JP)

G02B27/46; G02B5/30; G02F1/13; G03B11/00; H04N5/225; H04N101/00

WO2007083783A1

2007-07-26

JPH09261535A	1997-10-03
JPH0915535A	1997-01-17
JP2006113218A	2006-04-27
JP2004272170A	2004-09-30

OGURI Shohei et al. (JP)
Shohei Oguri (JP)

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