POSITION DETECTION APPARATUS

摘要

There is provided a position detection apparatus that includes an autofocus mechanism and an optical image stabilization mechanism by using a closed loop control, in which a magnet is commonly used as an autofocus magnet and an optical image stabilization magnet to achieve downsizing. The position detection apparatus includes the autofocus mechanism that moves a lens along an optical axis (Z axis) of the lens, and the optical image stabilization mechanism that moves the lens in a direction orthogonal to the optical axis. A permanent magnet is secured to the lens, and moves according to the movement of the lens. The amount of movement thereof is detected by position sensors. The permanent magnet for autofocus used in the autofocus mechanism and the permanent magnet for optical image stabilization used in the optical image stabilization mechanism is provided in the vicinity of the lens for common use.

主权项

1. A position detection apparatus that detects a position of a lens on a plane orthogonal to an optical axis direction of the lens to detect a position for optical image stabilization, and detects a position of the lens in the optical axis direction to detect a position for autofocus, the position detection apparatus comprising:
a magnet configured to move as the lens moves in the optical axis direction and in an in-plane direction orthogonal to the optical axis; a first position sensor for the autofocus configured to sense a magnetic field to be changed according to the movement of the magnet in the optical axis direction to detect the position of the lens in the optical axis direction; and a second position sensor for the optical image stabilization configured to sense a magnetic field to be changed according to the movement of the magnet in the plane orthogonal to the optical axis direction to detect the position of the lens on the plane orthogonal to the optical axis direction.