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Patent Searching and Data


Title:
OPTICAL UNIT, IMAGE CAPTURING DEVICE, AND ENDOSCOPE
Document Type and Number:
WIPO Patent Application WO/2016/189736
Kind Code:
A1
Abstract:
The purpose of the present invention is to enable highly precise detection of the position of a movable part even in a case where a plurality of coils are used. For this purpose, an optical unit according to the present invention is characterized by including: a holding unit that holds a group of lenses and that is movable relative to a predetermined fixed unit along the direction of an optical axis of the group of lenses; a first magnet that is magnetically polarized in a direction crossing the optical axis and that is provided on one of the fixed unit and the holding unit; a plurality of coils that are provided on the other one of the fixed unit and the holding unit, where the first magnet is not provided, and with which, in a case where a current is made to flow therethrough, the current is subjected to a force in the direction of the optical axis, exerted by a magnetic field generated by the first magnet; a second magnet that is provided on one of the fixed unit and the holding unit; and a magnetic sensor that is provided on the other one of the fixed unit and the holding unit, where the second magnet is not provided, that is disposed at a position where magnetic fields associated with at least two of the plurality of coils can be oriented so as to cancel out each other within a movable range of the holding unit, and that detects a magnetic field generated by the second magnet.

Inventors:
SHIGA, Yuichi (43-2 Hatagaya 2-chome, Shibuya-k, Tokyo 72, 〒1510072, JP)
Application Number:
JP2015/065433
Publication Date:
December 01, 2016
Filing Date:
May 28, 2015
Export Citation:
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Assignee:
OLYMPUS CORPORATION (43-2, Hatagaya 2-chome Shibuya-k, Tokyo 72, 〒1510072, JP)
International Classes:
G02B7/04; A61B1/00; G02B7/08; G02B23/24; H02K33/18
Foreign References:
JPH05328696A1993-12-10
JPS6188486U1986-06-09
JPS6450746A1989-02-27
JPH02114376U1990-09-13
JP2013011748A2013-01-17
JPH0486714A1992-03-19
JP2013530672A2013-07-25
JPH10225083A1998-08-21
Attorney, Agent or Firm:
SAKAI, Hiroaki (Sakai International Patent Office, Toranomon Mitsui Building 8-1, Kasumigaseki 3-chome, Chiyoda-k, Tokyo 13, 〒1000013, JP)
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