Title:
高速で周期的に変更される可変焦点距離レンズシステムのための自動合焦システム
Document Type and Number:
Japanese Patent JP6857524
Kind Code:
B2
Abstract:
A system for providing an automatically focused image comprises an imaging system including a high speed periodically modulated variable focal length (VFL) lens, a VFL lens controller, a VFL-projected light source, a focus determining portion, an exposure timing adjustment circuit, and an exposure strobe time controller. The focus determining portion comprises an optical detector that inputs reflected VFL-projected light that is projected to, and reflected from, a workpiece through the VFL lens, and provides a focus deviation signal. The exposure timing adjustment circuit provides an exposure timing adjustment signal based on the focus deviation signal, which indicates a time when the imaging system focus Z-height approximately coincides with the workpiece surface Z height. The exposure strobe time controller uses the exposure timing adjustment signal to adjust the image exposure time so the imaging system focus Z-height coincides with the workpiece surface Z height at the adjusted image exposure time.
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Inventors:
Robert Carmil Brill
Mark Lawrence Delaney
Mark Lawrence Delaney
Application Number:
JP2017056640A
Publication Date:
April 14, 2021
Filing Date:
March 22, 2017
Export Citation:
Assignee:
Mitutoyo Corporation
International Classes:
G01C3/06; G01B11/00; G02B7/28; G02B21/36
Domestic Patent References:
| JP2015104136A | ||||
| JP2015001531A | ||||
| JP2008233088A |
Foreign References:
| US20050121596 |
Attorney, Agent or Firm:
Yoshiyuki Inaba
Toshifumi Onuki
Akihiko Eguchi
Kazuhiko Naito
Toshifumi Onuki
Akihiko Eguchi
Kazuhiko Naito