Real-time particle sensor for disk drives

Details Real-time particle sensor for disk drives Real-time particle sensor for disk drives

1990-04-03

1991-10-08

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356339, G01N 1506

Patent

active

050556983

ABSTRACT:
A real-time particle sensor is provided which can monitor particles near the surface of a disk in a computer disk drive system and in the region between disks in a multiple disk stack. A laser and lens are housed in a compact cartridge which is mounted on an actuator arm of a disk. Photocells which are also mounted on the actuator arm detect light scattered by particles passing through the laser beam, and so generate an electrical signal used to count the detected particles. The sensor's small size allows a separate sensor to fit in each of the regions between adjacent disks in a stack of disks, or near the surface of a single disk.

REFERENCES:
patent: 3672775 (1972-06-01), Fruengel
patent: 4571079 (1986-02-01), Knollenberg
patent: 4685802 (1987-08-01), Saito et al.
patent: 4739177 (1988-04-01), Borden
patent: 4804853 (1989-02-01), Borden et al.
patent: 4896048 (1990-01-01), Borden
patent: 4920275 (1990-04-01), Itoh

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