Motion compensation device to compensate for motion of an optical system without using motion sensors
First Claim
1. A motion compensation device, comprisinga motion compensation optical system to compensate for motion causing image blur;
- a drive unit to drive the motion compensation optical system;
a drive signal detection unit to detect a drive signal when the motion compensation optical system receives an acceleration caused by motion; and
a control unit to control the drive unit based on the drive signal.
1 Assignment
0 Petitions
Accused Products
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.
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Citations
45 Claims
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1. A motion compensation device, comprising
a motion compensation optical system to compensate for motion causing image blur; -
a drive unit to drive the motion compensation optical system; a drive signal detection unit to detect a drive signal when the motion compensation optical system receives an acceleration caused by motion; and a control unit to control the drive unit based on the drive signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A motion compensation device, comprising:
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a motion compensation optical system to compensate for motion causing image blur; a drive unit to drive the motion compensation optical system; a drive signal detection unit to detect a drive signal when the motion compensation optical system receives acceleration caused by the motion causing image blur; an ideal drive signal calculating unit to calculate an ideal drive signal when the motion compensation optical system does not receive an acceleration caused by the motion causing image blur; a position instruction value calculating unit to calculate a position instruction value based on the drive signal and the ideal drive signal; a control unit to control the drive unit based on the position instruction value; and a memory unit to store at least one of constants and coefficients to calculate the ideal drive signal, wherein the ideal drive signal calculating unit calculates the ideal drive signal based on at least one of the constants and coefficients and the position instruction value. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A motion compensation device, comprising:
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a motion compensation optical system to compensate for motion causing image blur; a drive unit to drive the motion compensation optical system; a drive signal detection unit to detect a drive signal when the motion compensation optical system receives acceleration caused by the motion causing image blur; an ideal drive signal calculating unit to calculate an ideal drive signal when the motion compensation optical system does not receive an acceleration caused by motion; a position instruction value calculating unit to calculate a position instruction value based on the drive signal and the ideal drive signal; and a control unit to control the drive unit based on the position instruction value, wherein the ideal drive signal calculating unit represents a model of the drive unit described as an at least second order delay system, and the ideal drive signal calculating unit calculates the ideal drive signal based on the position instruction value. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A motion compensation device, comprising
a motion compensation optical system to compensate for motion causing image blur; -
a drive unit to drive the motion compensation optical system; a drive signal detection unit to detect the drive signal when the motion compensation optical system receives an acceleration caused by motion; an ideal drive signal calculating unit to calculate an ideal drive signal when the motion compensation optical system has not received an acceleration caused by motion; a position instruction value calculating unit to calculate a position instruction value based on the drive signal and the ideal drive signal; a control unit to control the drive unit based on the position instruction value; and a compensation commencement generating unit to generate a motion compensation commencement signal, wherein the ideal drive signal calculating unit calculates the ideal drive signal based on the position instruction value, and the control unit commences drive control of the drive unit based on the position instruction value, after a predetermined time has elapsed from receiving the motion compensation commencement signal. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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Specification