| 摘要 |
<p>PURPOSE:To perform reliable display by which a camera shake amount is confirmed at a glance by accurately detecting a signal level at which angular velocity is zero and exactly and rapidly detecting the camera shake amount. CONSTITUTION:This invention is applied to the camera shake detection device constituted of an angular velocity sensor 1, a low-pass filter 2, a high-pass filter and amplifier circuit 3, a CPU 4A and a display circuit 5A. By half- depressing a release button, the CPU 4A turns on an analog switch SW1, and power is supplied to the sensor 1. Thereafter, the switch SW1 is turned off and output from an operational amplifier OP is A/D converted to detect that the angular velocity is zero. When the output from the operational amplifier OP becomes a detection value showing that the angular velocity is zero, the CPU 4A temporarily turns on the switch SW1 so as to reduce the offset value, then it turns off the switch SW1. The detection value showing that the angular velocity is zero is calculated by continuously detecting that the angular velocity is zero hereafter. By subtracting the detection value showing that the angular velocity is zero from the A/D converted output, real angular velocity, that is, the camera shake amount is obtained.</p> |
