Invention Grant
US08773645B2 Distance measuring device and imaging device 有权
距离测量装置和成像装置

  • Patent Title: Distance measuring device and imaging device
  • Patent Title (中): 距离测量装置和成像装置
  • Application No.: US13318953
    Application Date: 2010-05-06
  • Publication No.: US08773645B2
    Publication 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
Distance measuring device and imaging device
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.
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