LENS DEVICE

WIPO Patent Application WO/2014/196388

A1

The purpose of the present invention is to reduce the size of an imaging lens unit (1D). A portion of a pencil of light rays expressing an object optical image is deflected vertically downwards by a polarization prism (6), and also deflected forwards by a total reflection mirror (40). A pencil of light rays totally reflected by the total reflection mirror (40) is split into three directions by a tri-directional splitting prism (91). The resultant pencils of light rays are respectively incident on a first optical-path-length-difference imaging element (21), a second optical-path-length-difference imaging element (22), and a phase difference imaging element (33) included in a phase-difference imaging optical system (30). Auto focus (AF) is performed on the basis of the optical path length difference from signals obtained from the optical-path-length-difference imaging elements (21, 22). Furthermore, AF is performed on the basis of the phase difference from a signal obtained from the phase-difference imaging element (33). The phase-difference imaging optical system (30) is disposed so as to be parallel with the axis (O1) of the light forming the object optical image. Accordingly, a reduction in the size of the imaging lens unit (1D) can be achieved.

MORI YOSHITAKA (JP)

PCT/JP2014/063774

December 11, 2014

May 26, 2014

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FUJIFILM CORP (JP)

G02B7/28; G02B7/34; G02B7/36; G02B7/38; G03B13/36; H04N5/232

JP2000266988A	2000-09-29
JPS58211721A	1983-12-09
JP2001264625A	2001-09-26
JP2004117491A	2004-04-15
JPH09274130A	1997-10-21
JPS61295523A	1986-12-26

PATENT PROFESSIONAL CORPORATION TOKYO UIT INTERNATIONAL (JP)
Tokyo UIT international patent business corporation (JP)

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