NDLI: Measurement of the chief ray angle of mobile phone camera

Content Provider	Springer Nature Link
Author	Yang, Ho Soon Jo, Yong Geol Kim, Gyu Ug Lee, Yun Woo
Copyright Year	2011
Abstract	The chief ray angle (CRA) of a mobile phone lens is related to the acceptance angle of the IR cutoff filter and micro lens array. The CRA of a lens need to be within an allowed value, otherwise image blurring or vignetting occurs. However, because of the compact size of mobile phone camera lenses, it is not easy to measure the CRA accurately. In this paper, we suggest a new method to measure the CRA of high-quality mobile phone camera lenses accurately using a laser beam as a light source and a plane mirror to collimate the beam in a double pass configuration. When the plane mirror is tilted to the same angle as the lens CRA, the spot center does not change, irrespective of the longitudinal position of the plane mirror. We manufactured the reference optics, which consisted of four spherical lenses, to verify our method. We found that our new CRA measurement method has 0.65° of measurement uncertainty for 15° CRA, which satisfies phone camera makers’ requirements.
Starting Page	403
Ending Page	407
Page Count	5
File Format	PDF
ISSN	13406000
Journal	Optical Review
Volume Number	18
Issue Number	5
e-ISSN	13499432
Language	English
Publisher	Optical Society of Japan
Publisher Date	2011-09-30
Publisher Place	Japan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	CRA mobile phone camera cat’s eye retroreflector reference optics first momentum Physics
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics

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