OPTICAL UNIT AND ENDOSCOPE

WIPO Patent Application WO/2016/098225

A1

[Problem] To provide a small and lightweight optical unit that drives a movable part forward and backward using a voice coil motor, and to provide an endoscope. [Solution] An optical unit 1 comprises: a tubular fixed part 2 which holds at least either a fixed lens group Gf on the object-side or a fixed lens group Gb on the image-side, and at least a part of which has a prescribed axis C as the center; a tubular movable part 3 provided radially inside the fixed part 2, having the axis C as the center, and holding a movable lens group Gv between the fixed lens group Gf on the object-side and the fixed lens group Gb on the image-side; and a voice coil motor 10 capable of moving the movable part 3 relative to the fixed part 2 along the axis C using a coil 11 disposed on the fixed part 2, and a magnet 12 disposed on the movable part 3 and magnetically polarized along a direction orthogonal to the axis C. The movable part 3 has a movable-side sliding surface allowing the movable part 3 to slide along the inner peripheral surface of the fixed part 2. The length L1 of the movable-part sliding surface from the point nearest the object to the point nearest the image along the axis C of the movable part 3 is longer than the length from the emission surface of the fixed lens group Gf on the object-side held by the fixed part 2 to the incident surface of the fixed lens group Gb on the image-side held by the fixed part 2.

IGUCHI TAKEHIKO (JP)

PCT/JP2014/083559

June 23, 2016

December 18, 2014

Click for automatic bibliography generation  

OLYMPUS CORP (JP)

G02B7/02; A61B1/00; G02B7/04; G02B23/24; G02B23/26; H04N5/225

WO2012137739A1

2012-10-11

JPH02301023A	1990-12-13
JPH05196850A	1993-08-06
JP2014002349A	2014-01-09

KOYAMA, Takashi et al. (JP)
Takushi Koyama (JP)

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