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Static Electrocity Shielding for Charge Type Shock Sensor on Flexible Cable Assembly inside HDD

IP.com Disclosure Number: IPCOM000014814D
Original Publication Date: 2001-Jun-01
Included in the Prior Art Database: 2003-Jun-20
Document File: 1 page(s) / 37K

Publishing Venue

IBM

Abstract

Disclosed is a method to use a shock sensor inside a Hard Disk Drive (HDD). The HDD uses a shock sensor for avoiding "off track writing" against shock and vibration in the HDD. The sensor is conventionally located on a Pattern Circuit Board (PCB) attached to Disk Enclosure (DE). Higher TPI (Tracks Per Inch) requires higher sensitivity and faster reaction against the shock and vibration. Locating the shock sensor inside the DE satisfies these requirements and can remove a blind frequency point for the shock. A point is to use the shock sensor of the electrostatic charge type for avoiding electromagnetic coupling noise due to longer line between the sensor and a amplifier. And it is important to keep stable voltage potential around the sensor. For example, a reference voltage pattern around the sensor and a grounded plate below the sensor are so effective to reduce electrostatic charge influence from outside potential change or electromagnetic noise. 1

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  Static Electrocity Shielding for Charge Type Shock Sensor on Flexible Cable Assembly inside HDD

Disclosed is a method to use a shock sensor inside a Hard Disk Drive (HDD). The HDD uses a shock sensor for avoiding "off track writing" against shock and vibration in the HDD. The sensor is conventionally located on a Pattern Circuit Board (PCB) attached to Disk Enclosure (DE). Higher TPI (Tracks Per Inch) requires higher sensitivity and faster reaction against the shock and vibration. Locating the shock sensor inside the DE satisfies these requirements and can remove a blind frequency point for the shock. A point is to use the shock sensor of the electrostatic charge type for avoiding electromagnetic coupling noise due to longer line between the sensor and a amplifier. And it is important to keep stable voltage potential around the sensor. For example, a reference voltage pattern around the sensor and a grounded plate below the sensor are so effective to reduce electrostatic charge influence from outside potential change or electromagnetic noise.

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