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1. (WO2017056675) AUTOFOCUSING DEVICE, LENS DEVICE, AND AUTOFOCUSING METHOD

Pub. No.:    WO/2017/056675    International Application No.:    PCT/JP2016/072296
Publication Date: Fri Apr 07 01:59:59 CEST 2017 International Filing Date: Sat Jul 30 01:59:59 CEST 2016
IPC: G02B 7/34
G03B 13/36
H04N 5/232
Applicants: FUJIFILM CORPORATION
富士フイルム株式会社
Inventors: WADA Tetsu
和田 哲
Title: AUTOFOCUSING DEVICE, LENS DEVICE, AND AUTOFOCUSING METHOD
Abstract:
The present invention provides an autofocusing device, a lens device and an autofocusing method capable of irradiating a subject being captured with auxiliary light corresponding to a change in the zoom magnification and the distance to the subject, and capable of emitting the auxiliary light with a reduced effect on an autofocusing optical system. An infrared dichroic mirror (26) splits subject light for autofocusing from a light path that introduces the subject light incident onto an imaging lens (14) into an imaging unit (16). The subject light for autofocusing is subjected to pupil division via a pupil division lens (41) arranged in a light shielding plate (42). A focus sensor (43) captures the subject light for autofocusing that passes through the pupil division lens to thereby acquire pupil information. A focus control unit (32) performs control so that the focal point of the imaging lens matches the focus position on the basis of the pupil information. An auxiliary light source (33) arranged in the light shielding plate irradiates the subject with auxiliary light for autofocusing via the imaging lens.