Self-Contained Acoustic Crash Detect Device for Magnetic Disk Storage Recording Device
Original Publication Date: 1987-Jul-01
Included in the Prior Art Database: 2005-Feb-01
A crash detection device shuts down a magnetic disk storage recording file before data is lost in the event of the head coming in contact with the disk (a head crash). The crash detection device includes a circuit that only requires a single 5-volt power supply and a 36 KHz bandpass filter. The single 5-volt power supply allows circuit application to be very flexible. The bandpass filter ascertains that only wanted frequencies are allowed through for accurate and precise signal output. The crash detection device also includes a microphone and the circuit and microphone are small enough that they could easily be installed as an integral part of the existing electronics for the disk storage recording device. (Image Omitted) A head crash emits ultrasonic vibrations at various frequencies 22.5, 36 and 42.5 KHz, Figs. 1 and 1C.