Camera driver

Abstract

The camera driver is provided with a camera part that comprises an image pickup element, a lens that forms an object image on the image pickup surface of the image pickup element and a lens barrel that holds the lens; a fixed unit, at least a portion of which is made of a magnetic substance and which comprises a protruding part provided with a shape that is at least a portion of a spherical surface; a movable unit that comprises a first movable part comprising an attraction magnet that generates a magnetic attraction force on the magnetic substance and a contact surface with a conical shape into which the protruding part fits as a result of the magnetic attraction force, and which rotates freely with respect to the center of the sphere of the spherical surface of the protruding part, and a second movable part, which is equipped with the camera part and fixed to the first movable part, and which comprises a fall-off prevention regulating surface provided with a prescribed intervening gap that allows free rotation with respect to the fixed unit when the first movable part rotates; a detector that detects the slant angle of the camera part with respect to the fixed unit and the rotation angle of the camera part around the optical axis of the lens; a first driving part that slants the camera part with respect to the fixed unit; and a second driving part that rotates the camera part with respect to the fixed unit around the center of the optical axis.

Description

technical field [0001] The present invention relates to a camera driving device capable of tilting a photographing unit including a lens barrel and an imaging element in a yaw direction (yawing) and a pitching direction (pitch) and rotating (rolling) around the optical axis of the photographing unit . Background technique [0002] In recent years, many video cameras and digital cameras on the market are equipped with hand shake correction devices that correct image shake of photographed images caused by hand shake. In this hand-shake correction device, a lens, a lens barrel, a mirror, an imaging element, etc. are tilted with respect to the optical axis of the camera, or moved two-dimensionally in a plane perpendicular to the optical axis. [0003] For example, Patent Document 1 discloses a shake correction mechanism that elastically supports a lens barrel at one point and tilts the lens barrel with respect to the optical axis. Patent Document 2 discloses a hand-shake corre...

AI Technical Summary

Problems solved by technology

However, the contact portion of the lens holder and the bracket installed on the outside has a large radius of rotation, so the frictional load applied to the movable part increases, and the movement distance becomes larger.

As a result, it is considered that as the inclination angle becomes larger, the fluctuation of the contact friction load increases, making accurate control difficult

In addition, when the distance between the lens holder and the bracket provided outside it is not correctly controlled, it is difficult to correctly control the inclination angle of the lens holder.

Depending on the processing accuracy of these parts, mechanical looseness may occur, which may hinder the frequency response characteristics of the movable part

[0013] In addition, the devices of Patent Documents 1 to 3 do not have a configuration for rotating constituent elements such as lenses around the optical axis of the photographing unit.

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