Optical unit with image stabilization function

Abstract

To increase shape precision of an annular groove in which a rolling element is rolled in a rotation support mechanism supporting a movable body so as to be rotatable around an optical axis.SOLUTION: In an optical unit 1 having a shake correction function, a rotation support mechanism 12 supporting a movable body 10 so as to be rotatable around an optical axis includes a first composite member 25 having a first metal member 51 and a first resin rail 50, a second composite member 55 having a second metal member 61 and a second resin rail 60, and a rolling element 56 inserted into a first annular groove 53 of the first rail 50 and a second annular groove 54 of the second rail 60. The first composite member 25 has a first engagement portion 76 made of a cured resin penetrating into a first hole 74 provided in the first member 51 when forming the first resin rail 50 by insert-molding. Similarly, the second composite member 55 has a second engagement portion 81 made of a cured resin into penetrating into a second hole 79 provided in the second member 61 when forming the second rail 60.SELECTED DRAWING: Figure 8

Claims

1. A movable body equipped with a camera module, A rotational support mechanism that supports the movable body so that it can rotate around the optical axis of the camera module, It has a fixed body that supports the movable body via the rotation support mechanism, The aforementioned rotational support mechanism is A first composite member comprising a metal first member having a first annular plate portion surrounding the optical axis, and a resin first rail disposed on the first annular plate portion, When the direction along the optical axis is defined as the optical axis direction, a second metal member is provided with a second annular plate portion that overlaps the first annular plate portion in the optical axis direction, and a second composite member is provided with a second resin rail arranged on the second annular plate portion and facing the first rail in the optical axis direction. The system comprises a first annular groove provided in the first rail, and a plurality of rolling elements inserted into a second annular groove provided in the second rail, which roll between the first rail and the second rail. The first rail includes a first engaging portion made of resin that fits into a first hole or first recess provided in the first annular plate portion, The optical unit with shake correction function is characterized in that the second rail includes a second engaging portion made of resin that fits into a second hole or second recess provided in the second annular plate portion.

2. The optical unit with vibration correction function according to claim 1, characterized in that it comprises at least one of a first retaining portion that protrudes from the first annular plate portion and bites into the first rail, and a second retaining portion that protrudes from the second annular plate portion and bites into the second rail.

3. The first annular plate portion is provided with a first hole that penetrates it, and the second annular plate portion is provided with a second hole that penetrates it. The first retaining portion is provided on the edge of the first hole, The optical unit with vibration correction function according to claim 2, characterized in that the second retaining portion is provided on the edge of the second hole.

4. The optical unit with shake correction function according to claim 2, characterized in that the first retaining portion and the second retaining portion protrude in a direction inclined with respect to the optical axis direction.

5. The first rail is positioned on the inner periphery of the first annular plate portion, The optical unit with vibration correction function according to claim 1, characterized in that the second rail is arranged on the inner peripheral edge of the second annular plate portion.

6. The optical unit with shake correction function according to claim 1, characterized in that gate marks are provided at two locations on opposite sides in the radial direction on each of the first rail and the second rail.

7. The first annular plate portion is provided with a plurality of first holes that penetrate the first annular plate portion, and two of the plurality of first holes are located in a position that coincides with the gate mark in the circumferential direction. The optical unit with shake correction function according to claim 6, characterized in that the second annular plate portion is provided with a plurality of second holes that penetrate the second annular plate portion, and two of the plurality of second holes are located in a circumferential position that coincides with the gate marks.

8. The first hole whose position in the circumferential direction coincides with the gate mark is larger than the first hole whose position in the circumferential direction does not coincide with the gate mark. The second hole whose position in the circumferential direction coincides with the gate mark is larger than the second hole whose position in the circumferential direction does not coincide with the gate mark, characterized in that the runout correction function is as described in claim 7. Optical unit.

9. The rotation support mechanism includes a pressurizing mechanism that applies a force to bring the first rail and the second rail closer together in the optical axis direction. The pre-pressure mechanism comprises a first protruding plate portion that protrudes outward from the first annular plate portion, and a pre-pressure magnet fixed to a portion of the second member in the circumferential direction around the optical axis. The first protruding plate portion is positioned such that the gate mark and its circumferential position coincide. The optical unit with vibration correction function according to claim 8, characterized in that the first protruding plate portion is made of a magnetic metal and is attracted to the pre-pressurizing magnet.

10. The movable body includes a frame-shaped holder that surrounds the outer periphery of the camera module. The first member includes a first extension that protrudes from the first annular plate portion toward the outer circumference, bends in the direction of the optical axis, and is connected to the holder. The optical unit with vibration correction function according to claim 7, characterized in that the gate mark provided on the first rail is located at a different position in the circumferential direction from the first extension portion.

11. The gimbal mechanism supports the rotation support mechanism so as to be rotatable around a first axis intersecting the optical axis, and supports the rotation support mechanism so as to be rotatable around a second axis intersecting the optical axis and the first axis. The first composite member is provided on the movable body, The optical unit with shake correction function according to claim 1, characterized in that the second composite member is supported so as to be rotatable around the first axis by the gimbal mechanism.

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