Motion compensation device to compensate for motion of an optica

Details Motion compensation device to compensate for motion of an optica Motion compensation device to compensate for motion of an optica

1998-09-30

1999-11-02

Perkey, W. B.

Photography

Camera shake sensing

With accelerometer

396 55, G03B 1700, G02B 2764

Patent

active

059786000

ABSTRACT:
A motion compensation device having a motion compensation lens which moves to compensate for motion caused by, e.g, hand shake, to prevent blur of an image formed on an image forming plane. An actuator drives the motion compensation lens and when the motion compensation lens moves, a drive current flows in a coil of the actuator. A drive current measuring device measures the drive current. An ideal drive current calculating unit calculates an ideal drive current when the motion compensation lens receives no acceleration. The ideal drive current calculating unit includes a virtual actuator. The virtual actuator is a model of an actuator which behaves similarly to the actual actuator. The ideal drive current calculating unit calculates the ideal drive current for the state in which there is no acceleration caused by hand shake. A position instruction value calculating unit finds a value proportional to the hand shake acceleration by comparing the drive current measured by the drive current measuring device with the ideal drive current calculated by the ideal drive current calculating unit. The position instruction value calculating unit calculates a drive amount (target position signal) of the motion compensation lens which is necessary in order to compensate the motion.

REFERENCES:
patent: 5095198 (1992-03-01), Nakazawa et al.
patent: 5652918 (1997-07-01), Usui

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