| 摘要 |
<p>PROBLEM TO BE SOLVED: To miniaturize a signal processing circuit of a vibration detecting device and reduce weight thereof. SOLUTION: An anode 64 of a semiconductor laser 61 is connected with an operational amplifier 19e for a buffer. A variable resistor 19k varies the resistance by a time constant control circuit 11c of a camera-microcomputer 11 according to an angular velocity frequency band. For instance, when a large angular velocity such as panning of the camera is forecast, the resistance of the variable resistor 19k is reduced and high frequencies are also adopted as a signal. Moreover, when the camera is held slowly and carefully, the variable resistor 19k is increased to cut off the high frequency components, and thus, an accurate angular velocity detection resistant to noise can be realized. The resistance of a variable resistor 19o is also varied by a time constant control 11c of the camera-microcomputer 11. An operational amplifier 19m compares the output of a high-pass filter composed of capacitance 19n and resistance 19o with a reference value (for instance, half of a circuit operating voltage), and accurately makes the beat frequency into a pulse shape to transmit it to the camera-microcomputer 11.</p> |
