US 10,895,756 B2Granted

Image shake correction device, imaging device, position detection method, position detection program

AssigneeFUJIFILM Corporation

InventorsKohei Awazu, Yasuhiro Miwa

Life of this patent

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Abstract

Data sets DS4 to DS6 each consisting of plural linear functions obtained by approximating an output characteristic of a Y-axis rotation position detection Hall element H2 and a data set DS2 consisting of plural linear functions obtained by approximating an output characteristic of an and the X-axis position detection Hall element H1 are stored for each of plural positions in a direction X in a ROM of a memory. A system controller detects a position of a movable member in the direction X based on the data set DS2 and an output signal of the X-axis position detection Hall element H1, then selects the data set corresponding to the position among the data sets DS4 to DS6, and detects a position of the movable member in a direction Y based on the selected data set and an output signal of the Y-axis rotation position detection Hall element H2.

Claims16

Dependent claims

An image shake correction device comprising:

a movable member to which a lens or an imaging element is fixed;
a support member that supports the movable member in a manner where the movable member is movable in a first direction and a second direction perpendicular to each other along a plane;
a first magnetic field detection element that detects a movement amount of the movable member in the first direction and a second magnetic field detection element that detects a movement amount of the movable member in the second direction, the first magnetic field detection element and the second magnetic field detection element being fixed to one of the movable member and the support member;
a first magnet that faces the first magnetic field detection element, and a second magnet that faces the second magnetic field detection element, the first magnet and the second magnet being fixed to the other one of the movable member and the support member;
a storage unit that stores a relationship between the movement amount of the movable member in the first direction and magnetic field information detected by the first magnetic field detection element, as a first set of linear functions corresponding to each division region in a case where a detection range of the magnetic field information detected by the first magnetic field detection element is divided into a plurality of division regions, stores the first set in association with each of a plurality of positions of the movable member in the second direction, and stores a relationship between the movement amount of the movable member in the second direction and magnetic field information detected by the second magnetic field detection element, as a second set of linear functions corresponding to each division region in a case where a detection range of the magnetic field information detected by the second magnetic field detection element is divided into a plurality of division regions;
and
a position detection unit that detects a position of the movable member in the second direction by using the magnetic field information detected by the second magnetic field detection element and the linear functions of the second set corresponding to the division region to which the magnetic field information belongs, and detects a position of the movable member in the first direction based on the position of the movable member in the second direction, the first set, and the magnetic field information detected by the first magnetic field detection element.

4 more elements

A position detection method of detecting a position of a movable member in an image shake correction device that includes the movable member to which a lens or an imaging element is fixed, a support member that supports the movable member in a manner where the movable member is movable in a first direction and a second direction perpendicular to each other along a plane, a first magnetic field detection element that detects a movement amount of the movable member in the first direction and a second magnetic field detection element that detects a movement amount of the movable member in the second direction, the first magnetic field detection element and the second magnetic field detection element being fixed to one of the movable member and the support member, and a first magnet that faces the first magnetic field detection element, and a second magnet that faces the second magnetic field detection element, the first magnet and the second magnet being fixed to the other one of the movable member and the support member, the method comprising:

a position detection step of reading out a second set of linear functions from a storage unit that stores a relationship between the movement amount of the movable member in the first direction and magnetic field information detected by the first magnetic field detection element, as a first set of linear functions corresponding to each division region in a case where a detection range of the magnetic field information detected by the first magnetic field detection element is divided into a plurality of division regions, stores the first set in association with each of a plurality of positions of the movable member in the second direction, and stores a relationship between the movement amount of the movable member in the second direction and magnetic field information detected by the second magnetic field detection element, as the second set of the linear functions corresponding to each division region in a case where a detection range of the magnetic field information detected by the second magnetic field detection element is divided into a plurality of division regions, detecting a position of the movable member in the second direction by using the magnetic field information detected by the second magnetic field detection element and the linear functions of the second set corresponding to the division region to which the magnetic field information belongs, and detecting a position of the movable member in the first direction based on the position of the movable member in the second direction, the first set read out from the storage unit, and the magnetic field information detected by the first magnetic field detection element.

A non-transitory computer readable medium storing a position detection program causing a computer to detect a position of a movable member in an image shake correction device that includes the movable member to which a lens or an imaging element is fixed, a support member that supports the movable member in a manner where the movable member is movable in a first direction and a second direction perpendicular to each other along a plane, a first magnetic field detection element that detects a movement amount of the movable member in the first direction and a second magnetic field detection element that detects a movement amount of the movable member in the second direction, the first magnetic field detection element and the second magnetic field detection element being fixed to one of the movable member and the support member, and a first magnet that faces the first magnetic field detection element, and a second magnet that faces the second magnetic field detection element, the first magnet and the second magnet being fixed to the other one of the movable member and the support member, the program causing the computer to execute:

a position detection step of reading out a second set of linear functions from a storage unit that stores a relationship between the movement amount of the movable member in the first direction and magnetic field information detected by the first magnetic field detection element, as a first set of linear functions corresponding to each division region in a case where a detection range of the magnetic field information detected by the first magnetic field detection element is divided into a plurality of division regions, stores the first set in association with each of a plurality of positions of the movable member in the second direction, and stores a relationship between the movement amount of the movable member in the second direction and magnetic field information detected by the second magnetic field detection element, as the second set of the linear functions corresponding to each division region in a case where a detection range of the magnetic field information detected by the second magnetic field detection element is divided into a plurality of division regions, detecting a position of the movable member in the second direction by using the magnetic field information detected by the second magnetic field detection element and the linear functions of the second set corresponding to the division region to which the magnetic field information belongs, and detecting a position of the movable member in the first direction based on the position of the movable member in the second direction, the first set read out from the storage unit, and the magnetic field information detected by the first magnetic field detection element.

Dependencies are inferred from the claim text.

Facts

Application: 16/912,676Filed 25 Jun 2020 · continuation
Priority: JP 2017-25422928 Dec 2017
Published: US 2020/0326557 A115 Oct 2020
Granted: 19 Jan 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

G02B 27/646
Imaging systems using optical elements for stabilisation of the lateral and angular position of the image: compensating for small deviations, e.g.…
G02B 7/08
With mechanism for focusing or varying magnification: adapted to co-operate with a remote control mechanism
G02B 7/102
By relative axial movement of several lenses, e.g. of varifocal objective lens: controlled by a microcomputer
G02B 7/1828
Motorised alignment: using magnetic means