JP-7854887-B2 - Optical unit with image stabilization function

JP7854887B2JP 7854887 B2JP7854887 B2JP 7854887B2JP-7854887-B2

Inventors

笠原章吾
須江猛

Assignees

ニデックインスツルメンツ株式会社

Dates

Publication Date: 20260507
Application Date: 20220720

Claims (11)

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.
The optical unit with vibration correction function according to claim 1, characterized by comprising 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.
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.
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.
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.
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 and second rails.
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.
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 optical unit with shake correction function according to claim 7, characterized in that 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.
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.
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.
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 about the first axis by the gimbal mechanism.

Description

This invention relates to an optical unit with a shake correction function that corrects shake by rotating the camera module around the optical axis. Some optical units mounted on mobile devices and mobile bodies rotate a movable body containing a camera module around the optical axis, around a first axis intersecting the optical axis, and around a second axis intersecting both the optical axis and the first axis, in order to suppress image distortion during movement of the mobile device or mobile body. Patent Document 1 describes this type of optical unit with image stabilization function. The optical unit with shake correction function described in Patent Document 1 comprises a movable body equipped with a camera module, a rotational support mechanism that supports the movable body so as to be rotatable around the optical axis, a gimbal mechanism that supports the movable body so as to be rotatable around a first axis and a second axis via the rotational support mechanism, and a fixed body that supports the movable body via the rotational support mechanism and the gimbal mechanism. The rotational support mechanism has a first annular plate portion (plate roll annular portion) provided on the movable body and a second annular plate portion (plate holder annular portion) supported by the gimbal mechanism, which face each other in the direction of the optical axis. A sphere rolls in an annular groove with an arc-shaped cross-section provided on both the plate roll annular portion and the plate holder annular portion. Japanese Patent Publication No. 2021-28654 This is a perspective view of an optical unit with image stabilization.This is an exploded perspective view of an optical unit with image stabilization.This is a plan view of the optical unit with image stabilization function, with the cover removed, as seen from the subject side.This is a disassembled perspective view of the optical unit with image stabilization, with the cover and base removed.This is a cross-sectional view of the optical unit with shake correction function, cut at position A-A in Figure 3.This is a cross-sectional view of the optical unit with shake correction function, cut at position B-B in Figure 3.This is a perspective view of the movable body and rotation support mechanism from the perspective of the subject.This is an exploded perspective view of the movable body and rotational support mechanism.This is an exploded perspective view of the rotation support mechanism.These are the plan view and bottom view of the first composite member.These are the plan view and bottom view of the second composite member.This is a cross-sectional view of the rotation support mechanism (a cross-sectional view cut at the position of the gate mark on the first rail).This is a cross-sectional view of the rotation support mechanism (a cross-sectional view cut at the position of the gate mark on the second rail).This is a cross-sectional view of the rotational support mechanism (a cross-sectional view cut at the position of the first hole, where there are no gate marks).This is an explanatory diagram of the first composite member of modified example 1.This is an explanatory diagram of the first composite member of modified example 2.This is an explanatory diagram of the first composite member of modified example 3. Below, with reference to the drawings, an embodiment of an optical unit with shake correction function to which the present invention is applied will be described. (Overall structure) Figure 1 is a perspective view of the optical unit 1 with image stabilization function. Figure 2 is an exploded perspective view of the optical unit 1 with image stabilization function. Figure 3 is a plan view of the optical unit 1 with image stabilization function with the cover 4 removed, as seen from the subject side. Figure 4 is an exploded perspective view of the optical unit 1 with image stabilization function with the cover 4 and base 5 removed. As shown in Figures 1 and 2, the optical unit 1 with image stabilization function comprises a movable body 10 equipped with a camera module 2, and a fixed body 11 surrounding the movable body 10 from the outer periphery. The fixed body 11 comprises a frame-shaped case 3 surrounding the movable body 10 from the outer periphery, a cover 4 fixed to the case 3 from the subject side of the camera module 2, and a base 5 fixed to the case 3 from the opposite side of the camera module 2, covering the movable body 10 from the opposite side. Furthermore, the optical unit 1 with image stabilization function includes a flexible printed circuit board 6 extending from the movable body 10 and a flexible printed circuit board 7 routed along the outer periphery of the case 3. The optical unit 1 with shake correction function is used, for example, in optical devices such as camera-equipped mobile phones and dashcams, as well as in optical devices such as action cameras and wearable cameras mounted on mobile devices such as helmet