Invention Grant
- Patent Title: Distance measuring device and imaging device
- Patent Title (中): 距离测量装置和成像装置
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Application No.: US13318953Application Date: 2010-05-06
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Publication No.: US08773645B2Publication Date: 2014-07-08
- Inventor: Yasushi Ogino
- Applicant: Yasushi Ogino
- Applicant Address: JP Tokyo
- Assignee: Nikon Corporation
- Current Assignee: Nikon Corporation
- Current Assignee Address: JP Tokyo
- Agency: Oliff PLC
- Priority: JP2009-118512 20090515
- International Application: PCT/JP2010/003110 WO 20100506
- International Announcement: WO2010/131436 WO 20101118
- Main IPC: G01C3/08
- IPC: G01C3/08

Abstract:
A distance measuring device including a polarizing element disposed on a plane conjugate with a pupil of an objective lens, an optical rotatory plate rotating a polarizing axis of light which has passed through the polarizing element, a polarization separation element separating light which has passed through the optical rotatory plate into a first light beam and a second light beam, a first imaging element forming a first image by the first light beam, a second imaging element forming a second image by the second light beam, and a focus detector detecting a focus state based on relative deviation between the first image and the second image which correspond to a same region of a subject.
Public/Granted literature
- US20120120383A1 DISTANCE MEASURING DEVICE AND IMAGING DEVICE Public/Granted day:2012-05-17
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