Optical unit with shake correction function
In an optical unit with a shake correction function, a first flexible printed board and a second flexible printed board may extend in a +X direction perpendicular to an optical axis from a chassis surrounding the outer circumference side of a movable body and a gimbal structure. A cover may house the chassis and bend portions of the first flexible printed board and the second flexible printed board. The cover may include an image-side cover and an object-side cover, and the first flexible printed board and the second flexible printed board may include securing portions that are secured to the image-side cover. The object-side cover may include a first cover covering the chassis and a second cover covering the first flexible printed board and the second flexible printed board. The first cover may include a cover portion covering the coupling position of the chassis and the second cover.
1. An optical unit with a shake correction function, comprising:
a movable body including a lens;
a gimbal structure to support the movable body rotatably around a first axis intersecting with an optical axis of the lens and rotatably around a second axis intersecting with the optical axis and the first axis;
a securing body to support the movable body via the gimbal structure; and
a flexible printed board extending from the movable body in a first direction intersecting with the optical axis, wherein
the securing body includes:
a chassis to surround an outer circumference side of the movable body and the gimbal structure; and
a cover to house the chassis and the flexible printed board extending to a side of the chassis in the first direction,
the flexible printed board includes:
a securing portion secured to the cover; and
a bend portion extending in a bended form between the securing portion and the movable body,
the cover includes:
an image-side cover to cover the chassis and the flexible printed board from an image side in a direction of the optical axis; and
an object-side cover to cover the chassis and the flexible printed board from an object side in the direction of the optical axis,
the object-side cover includes:
a first cover to cover the chassis; and
a second cover disposed on the side of the chassis in the first direction to cover the flexible printed board, and
an end in the first direction of the first cover includes a cover portion to cover a coupling position of the chassis and the second cover.
2. The optical unit with the shake correction function according to claim 1 , wherein
the image-side cover and the first cover are made of metal,
the second cover is made of a resin, and
an end of the second cover, which end is opposite to the chassis, includes a recessed portion that is provided in an area covered with the cover portion and is recessed with a depth substantially equal to a thickness of the first cover.
3. The optical unit with the shake correction function according to claim 2 , further comprising an adhesive reservoir provided at a coupling position of the first cover and the second cover, wherein the adhesive reservoir includes a cutout portion formed by cutting out an edge of the cover portion.
4. The optical unit with the shake correction function according to claim 3 , wherein
the image-side cover includes a first elastic engagement portion extending along a side plate of the chassis, and
the chassis includes a first engagement portion to engage with the first elastic engagement portion.
5. The optical unit with the shake correction function according to claim 3 , wherein the image-side cover includes a second elastic engagement portion extending along a side surface of the second cover, and
the second cover includes a second engagement portion to engage with the second elastic engagement portion.
6. The optical unit with the shake correction function according to claim 3 , wherein
the second cover includes:
an upper plate portion facing the image-side cover; and
a hook provided on an edge of the upper plate portion, which edge is opposite to the chassis, and
the chassis includes a fitting portion into which the hook is fitted.
7. The optical unit with the shake correction function according to claim 2 , wherein
the chassis includes:
a center side plate facing in the first direction;
a first-side side plate disposed on a first side in a circumferential direction of the center side plate; and
a second-side side plate disposed on a second side in the circumferential direction of the center side plate,
the first-side side plate is inclined to the first side in the circumferential direction with respect to the center side plate,
the second-side side plate is inclined to the second side in the circumferential direction with respect to the center side plate,
the second cover includes a first inclined surface facing the first-side side plate and a second inclined surface facing the second-side side plate, and
an area where the cover portion covers the coupling position of the chassis and the second cover includes:
a first labyrinth structure including an area where the first-side side plate faces the first inclined surface; and
a second labyrinth structure including an area where the second-side side plate faces the second inclined surface.
8. The optical unit with the shake correction function according to claim 2 , wherein
the image-side cover includes a first elastic engagement portion extending along a side plate of the chassis, and
the chassis includes a first engagement portion to engage with the first elastic engagement portion.
9. The optical unit with the shake correction function according to claim 2 , wherein
the image-side cover includes a second elastic engagement portion extending along a side surface of the second cover, and
the second cover includes a second engagement portion to engage with the second elastic engagement portion.
10. The optical unit with the shake correction function according to claim 2 , wherein
the second cover includes:
an upper plate portion facing the image-side cover; and
a hook provided on an edge of the upper plate portion, which edge is opposite to the chassis, and
the chassis includes a fitting portion into which the hook is fitted.
11. The optical unit with the shake correction function according to claim 1 , wherein
the chassis includes:
a center side plate facing in the first direction;
a first-side side plate disposed on a first side in a circumferential direction of the center side plate; and
a second-side side plate disposed on a second side in the circumferential direction of the center side plate,
the first-side side plate is inclined to the first side in the circumferential direction with respect to the center side plate,
the second-side side plate is inclined to the second side in the circumferential direction with respect to the center side plate,
the second cover includes a first inclined surface facing the first-side side plate and a second inclined surface facing the second-side side plate, and
an area where the cover portion covers the coupling position of the chassis and the second cover includes:
a first labyrinth structure including an area where the first-side side plate faces the first inclined surface; and
a second labyrinth structure including an area where the second-side side plate faces the second inclined surface.
12. The optical unit with the shake correction function according to claim 1 , wherein
the image-side cover includes a first elastic engagement portion extending along a side plate of the chassis, and
the chassis includes a first engagement portion to engage with the first elastic engagement portion.
13. The optical unit with the shake correction function according to claim 12 , wherein
the image-side cover includes a second elastic engagement portion extending along a side surface of the second cover, and
the second cover includes a second engagement portion to engage with the second elastic engagement portion.
14. The optical unit with the shake correction function according to claim 12 , wherein
the second cover includes:
an upper plate portion facing the image-side cover; and
a hook provided on an edge of the upper plate portion, which edge is opposite to the chassis, and
the chassis includes a fitting portion into which the hook is fitted.
15. The optical unit with the shake correction function according to claim 1 , wherein
the image-side cover includes a second elastic engagement portion extending along a side surface of the second cover, and
the second cover includes a second engagement portion to engage with the second elastic engagement portion.
16. The optical unit with the shake correction function according to claim 1 , wherein
the second cover includes:
an upper plate portion facing the image-side cover; and
a hook provided on an edge of the upper plate portion, which edge is opposite to the chassis, and
the chassis includes a fitting portion into which the hook is fitted.