EP-4738000-A1 - INTERCHANGEABLE LENS AND IMAGING DEVICE

Abstract

In an interchangeable lens, an actuator includes a coil attached to the movable body, an axial direction of the coil being an optical axis direction, and a first drive magnet and a second drive magnet positioned on opposite sides in the optical axis direction with the coil interposed therebetween, the first drive magnet is positioned closer to the fixed body than the second drive magnet, a plurality of surface portions including a main surface portion having a maximum area is provided in the magnetic plate, and the main surface portion is positioned in a state of facing the first drive magnet to be closer to the first drive magnet than a center between the first drive magnet and the second drive magnet.

Inventors

• YAMAGUCHI, YUYA

Assignees

• Sony Group Corporation

Dates

Publication Date

20260506

Application Date

20240620

Claims (7)

1. An interchangeable lens comprising: a fixed body fixed inside an external barrel; a movable body including a holding frame that holds a lens, the movable body being moved in a first direction and a second direction orthogonal to an optical axis direction with respect to the fixed body; two actuators that apply moving forces in the first direction and the second direction to the movable body; a plurality of spheres rollable between the fixed body and the movable body; and a magnetic plate that biases the movable body in a direction approaching the fixed body in the optical axis direction, wherein the actuator includes a coil attached to the movable body, an axial direction of the coil being the optical axis direction, and a first drive magnet and a second drive magnet positioned on opposite sides in the optical axis direction with the coil interposed therebetween, the first drive magnet is positioned closer to the fixed body than the second drive magnet, a plurality of surface portions including a main surface portion having a maximum area is provided in the magnetic plate, and the main surface portion is positioned in a state of facing the first drive magnet to be closer to the first drive magnet than a center between the first drive magnet and the second drive magnet.
2. The interchangeable lens according to claim 1, wherein the coil is formed in a rectangular tube shape and includes a pair of longitudinal portions and a pair of lateral portions, and the main surface portion is formed in a shape extending in a longitudinal direction of the longitudinal portion.
3. The interchangeable lens according to claim 2, wherein a projecting surface portion protruding from the main surface portion in a direction orthogonal to the longitudinal direction of the longitudinal portion is provided in the magnetic plate.
4. The interchangeable lens according to claim 2, wherein a holding portion that holds the lens and coupling protrusions that protrude from the holding portion and to which the coil is attached are provided in the holding frame, a pair of coupling surface portions protruding in the same direction from both end portions in a longitudinal direction of the main surface portion and a pair of overhanging surface portions protruding in a direction separated from each other from distal end portions of the coupling surface portions are provided in the magnetic plate, and the overhanging surface portions are attached to the coupling protrusions.
5. The interchangeable lens according to claim 4, wherein a surface of the overhanging surface portion facing the first drive magnet side is formed as an attached surface, and the magnetic plate is attached to the coupling protrusion in a state where the attached surface is brought into surface contact with the coupling protrusion.
6. The interchangeable lens according to claim 1, wherein a holding portion that holds the lens and a coupling protrusion that protrudes from the holding portion and to which the coil is attached are provided in the holding frame, and the coil and the magnetic plate are attached to the coupling protrusion.
7. An imaging device comprising: a fixed body fixed inside a device body including an imaging element that converts a captured optical image into an electrical signal; a movable body including a holding frame that holds a lens, the movable body being moved in a first direction and a second direction orthogonal to an optical axis direction with respect to the fixed body; two actuators that apply moving forces in the first direction and the second direction to the movable body; a plurality of spheres rollable between the fixed body and the movable body; and a magnetic plate that biases the movable body in a direction approaching the fixed body in the optical axis direction, wherein the actuator includes a coil attached to the movable body, an axial direction of the coil being the optical axis direction, and a first drive magnet and a second drive magnet positioned on opposite sides in the optical axis direction with the coil interposed therebetween, the first drive magnet is positioned closer to the fixed body than the second drive magnet, a plurality of surface portions including a main surface portion having a maximum area is provided in the magnetic plate, and the main surface portion is positioned in a state of facing the first drive magnet to be closer to the first drive magnet than a center between the first drive magnet and the second drive magnet.

Description

TECHNICAL FIELD The present technology relates to a technical field of an interchangeable lens and an imaging device having a configuration in which a movable body is movable in a direction orthogonal to an optical axis direction with respect to a fixed body. BACKGROUND ART An imaging device such as a video camera or a still camera or an interchangeable lens detachably attached to the imaging device includes a shake correction mechanism that moves the lens in a direction orthogonal to an optical axis direction to correct camera shake and improve image quality. Such an interchangeable lens and imaging device include, for example, a shake correction mechanism in which a movable body having a lens is movable in a first direction orthogonal to the optical axis direction and a second direction orthogonal to both the optical axis direction and the first direction (see, for example, Patent Document 1). In the imaging device described in Patent Document 1, two actuators each including a drive magnet, a coil, and a yoke are provided, the coil is attached to the movable body, and the drive magnet is attached to the fixed body. The movable body is moved in the first direction together with the coil of one actuator by a driving force of one actuator, and the movable body is moved in the second direction together with the coil of the other actuator by a driving force of the other actuator. The imaging device described in Patent Document 1 has a structure in which a first drive magnet and a second drive magnet are arranged on opposite side with the coil interposed therebetween, and high drive efficiency of the shake correction mechanism can be secured. Furthermore, a plurality of rollable spheres is arranged between the fixed body and the movable body, and the movable body is set to be movable in a direction orthogonal to the optical axis direction with respect to the fixed body by rolling the spheres with respect to the fixed body and the movable body. A magnetic plate is attached to the movable body, and a position and a posture of the movable body in the optical axis direction with respect to the fixed body are maintained by attracting the magnetic plate to the drive magnet and biasing the movable body in a direction of approaching the fixed body. CITATION LIST PATENT DOCUMENT Patent Document 1: Japanese Patent Application Laid-Open No. 2020-101783 SUMMARY OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION Incidentally, in a case where the first drive magnet and the second drive magnet are arranged on opposite sides with the coil interposed therebetween in the configuration in which the rollable spheres are provided as described above, since the magnetic plate is attracted from both the first drive magnet and the second drive magnet, there is a concern that an attraction force is fluctuated by a moving position of the movable body with respect to the fixed body, and a stable posture of the movable body with respect to the fixed body is not secured. Therefore, an object of an interchangeable lens and an imaging device according to the present technology is to suppress fluctuations in an attraction force of a drive magnet with respect to a magnetic plate at the time of shake correction and to maintain a stable posture of the movable body with respect to the fixed body. SOLUTIONS TO PROBLEMS An interchangeable lens according to the present technology includes a fixed body fixed inside an external barrel, a movable body including a holding frame that holds a lens, the movable body being moved in a first direction and a second direction orthogonal to an optical axis direction with respect to the fixed body, two actuators that apply moving forces in the first direction and the second direction to the movable body, a plurality of spheres rollable between the fixed body and the movable body, and a magnetic plate that biases the movable body in a direction approaching the fixed body in the optical axis direction. The actuator includes a coil attached to the movable body, an axial direction of the coil being the optical axis direction, and a first drive magnet and a second drive magnet positioned on opposite sides in the optical axis direction with the coil interposed therebetween, the first drive magnet is positioned closer to the fixed body than the second drive magnet, a plurality of surface portions including a main surface portion having a maximum area is provided in the magnetic plate, and the main surface portion is positioned in a state of facing the first drive magnet to be closer to the first drive magnet side than a center between the first drive magnet and the second drive magnet. Therefore, the main surface portion having the maximum area in the magnetic plate is attracted by the first drive magnet positioned closer to the fixed body than the second drive magnet. An imaging device according to the present technology includes a fixed body fixed inside a device body including an imaging element that converts a c