Title:
LENS DRIVING DEVICE, LENS DRIVING METHOD, AND IMAGING DEVICE
Document Type and Number:
Japanese Patent JP2019135556
Kind Code:
A
Abstract:
To provide a lens driving device, a lens driving method, and an imaging device that enable high accuracy of position detection to be surely maintained even with change in environment and the like.SOLUTION: The lens driving device comprises: displacement detection means for outputting a two-phase sine wave signal having a phase displaced at 90 degrees in accordance with displacement of a lens for a focus adjustment; correction coefficient holding means for holding a correction coefficient for use in correcting the two-phase sine wave signal; correction means for correcting amplitude and offset of the two-phase sine wave signal, by using the correction coefficient; position calculation means for calculating a position in an optical axis of the lens, by using the two-phase sine wave signal corrected by the correction means; correction coefficient generation means for, when a predetermined condition is satisfied, generating a new correction coefficient, and updating the correction coefficient held by the correction coefficient means to a new correction coefficient; and control means for, when the correction coefficient means generates the new correction coefficient, limiting movement velocity of the lens to velocity equal to or less than predetermined velocity.SELECTED DRAWING: Figure 3
Inventors:
SANADA SATORU
Application Number:
JP2019079305A
Publication Date:
August 15, 2019
Filing Date:
April 18, 2019
Export Citation:
Assignee:
NIKON CORP
International Classes:
G02B7/08; G02B7/28; G03B21/53
Domestic Patent References:
| JP2004037121A | 2004-02-05 | |||
| JP2005003559A | 2005-01-06 | |||
| JPH06105206A | 1994-04-15 | |||
| JPH0835858A | 1996-02-06 | |||
| JPH02251720A | 1990-10-09 | |||
| JP2014164244A | 2014-09-08 | |||
| JP2017191343A | 2017-10-19 |
Attorney, Agent or Firm:
Inoue International Patent and Trademark Office
Yoshio Inoue
Kenichi Aihara
Ryuji Ito
Junko Inoue
Yoshio Inoue
Kenichi Aihara
Ryuji Ito
Junko Inoue