Disc drive component level shock tester

• US 6,553,807 B2
• Filed: 06/27/2001
• Issued: 04/29/2003
• Est. Priority Date: 02/22/1999
• Status: Expired due to Fees

• Current Assignee: Seagate Technology LLC (Seagate Technology Holdings Plc)
• Original Assignee: Seagate Technology LLC (Seagate Technology Holdings Plc)
• Inventors: Griep, Jerome Frederick, Luk, Allan Kai, Renken, Frederick Paul, Bement, Gary Edwin
• Primary Examiner(s): Noori, Max
• Application Number:
  US09/894,639
• Publication Number:
  US 20020035865A1
• Time in Patent Office: 671 Days
• Field of Search: 73/110.1, 73/120.1, 73/120.4, 73/120.9
• US Class Current: 73/12.09
• CPC Class Codes: G01N 1/2202 involving separation of sample components during sampling
• CPC Class Codes: G01N 1/24 Suction devices G01N1/22 - G01N1/2294 take precedence
• CPC Class Codes: G01N 2001/2223 aerosol sampling devices
• CPC Class Codes: G01N 3/30 by applying a single impulsive force, e.g. by falling weight
• CPC Class Codes: G11B 33/08 Insulation or absorption of undesired vibrations or sounds

Abstract

A shock test apparatus for evaluating the shock performance of individual disc drive components includes a base portion and a top cover connected to the base portion to define an interior volume. First and second disc drive components are secured within the interior volume of the apparatus to engage one another in the absence of a shock event. A shock pulse generator includes an actuator for imparting a shock pulse to one of the disc drive components. A second shock pulse generator can be used to impart a shock pulse to the second disc drive component. Measurements are made of both the shock imparted to the disc drive components and the interaction between the first and second disc drive components during the shock event.

Claims

1. A shock test apparatus for evaluating the shock performance of individual disc drive components, the apparatus comprising:

a base portion;

a top cover detachably secured to the base portion to define an interior volume;

first and second disc drive components detachably secured within the interior volume of the apparatus so that the first disc drive component contacts the second disc drive component in the absence of a shock event;

a shock pulse generator extending into the interior volume of the apparatus, the shock pulse generator having an actuator that moves vertically in relation to the generator, the actuator imparting a shock pulse to the first disc drive component to create a dynamic interaction between the first and second disc drive components; and

means for measuring the dynamic interaction between the first and second disc drive components.

2. A shock test apparatus as defined in claim 1 wherein the first disc drive component is a head suspension assembly and the second disc drive component is a ramp for holding the head suspension assembly.

3. A shock test apparatus as defined in claim 2 further comprising:

an actuator arm attached to a proximal end of the head suspension assembly;

a support for holding the actuator arm above the actuator of the shock pulse generator; and

a programmer disc positioned between the actuator arm and the actuator of the shock pulse generator, the programmer disc adapted to alter the shock pulse imparted to the head suspension assembly.

4. A shock test apparatus as defined in claim 1 wherein the first disc drive component is a head suspension assembly and the second disc drive component is a media disc that supports a slider of the head suspension assembly.

5. A shock test apparatus as defined in claim 4 further comprising:

an actuator arm attached to a proximal end of the head suspension assembly;

a support for holding the actuator arm above the actuator of the shock pulse generator; and

a programmer disc positioned between the actuator arm and the actuator of the shock pulse generator, the programmer disc adapted to alter the shock pulse imparted to the head suspension assembly.

6. A shock test apparatus as defined in claim 1 further comprising:

a second shock pulse generator extending into the interior volume of the apparatus, the second shock pulse generator having an actuator that imparts a shock pulse to the second disc drive component.

7. A shock test apparatus as defined in claim 6 wherein the first disc drive component is a head suspension assembly and the second disc drive component is a media disc that supports a slider of the head suspension assembly.

8. A shock test apparatus as defined in claim 7 further comprising:

an actuator arm attached to a proximal end of the head suspension assembly;

a support for holding the actuator arm above the actuator of the first aforesaid shock pulse generator; and

a programmer disc positioned between the actuator arm and the actuator of the first shock pulse generator, the programmer disc adapted to alter the shock pulse imparted to the head suspension assembly.

9. A shock test apparatus as defined in claim 8 further comprising:

a hub operatively attached to the actuator of the second shock pulse generator to allow rotation of the hub relative to the actuator, wherein the media disc is attached to the hub.

10. A shock test apparatus as defined in claim 9 wherein the means for measuring the dynamic interaction between the first and second disc drive components includes a sample collection disc attached to the hub below the media disc.

11. A shock test apparatus as defined in claim 10 wherein the base portion defines at least one access port to allow rotation of the hub from an exterior of the apparatus, the apparatus further comprising:

an adhesive cover to seal the access port.

12. A shock test apparatus as defined in claim 9 wherein the means for measuring the dynamic interaction between the first and second disc drive components includes a first accelerometer attached to one of the actuator arm and the head suspension assembly and a second accelerometer attached to the hub.

13. A shock test apparatus as defined in claim 12 wherein the means for measuring the dynamic interaction between the first and second disc drive components further includes an acoustic emission sensor attached within the interior volume of the apparatus.

14. A shock test apparatus as defined in claim 12 wherein the means for measuring the dynamic interaction between the first and second disc drive components further includes an opening formed in the top cover of the apparatus and positioned over the head suspension assembly, the opening including a window formed from anti-reflective glass to allow for observation of the head suspension assembly and the media disc.

15. A system for evaluating the shock performance of individual disc drive components, the system comprising:

an enclosure having a base portion and a top cover detachably secured together to define an interior volume of the enclosure, the enclosure securing first and second disc drive components within the interior volume so that the first disc drive component contacts the second disc drive component in the absence of a shock event;

a shock pulse generator having an actuator extending into the interior volume of the enclosure, the actuator moving vertically to impart a shock pulse to the first disc drive component to create a dynamic interaction between the first and second disc drive components;

means for measuring the shock pulse imparted to the first disc drive component; and

means for measuring the dynamic interaction between the first and second disc drive components.

16. A system as defined in claim 15 further comprising:

a second shock pulse generator having an actuator extending into the interior volume of the enclosure to impart a shock pulse to the second disc drive component; and

means for measuring the shock pulse imparted to the second disc drive component.

17. A system as defined in claim 16 wherein the first disc drive component is a head suspension assembly and the second disc drive component is a media disc that supports a slider of the head suspension assembly.

18. A system as defined in claim 17 further comprising:

a hub operatively attached to the actuator of the second shock pulse generator to allow rotation of the hub relative to the actuator of the second shock pulse generator, wherein the media disc is attached to the hub.

19. A system as defined in claim 18 wherein the means for measuring the shock pulses imparted to the first and second disc drive components include:

a first accelerometer attached to the head suspension assembly; and

a second accelerometer attached to the hub.

20. A system as defined in claim 18 wherein:

the top cover of the enclosure defines an opening positioned over the head suspension assembly, the opening including a window formed from anti-reflective glass; and

the means for measuring the dynamic interaction between the first and second disc drive components includes a laser Doppler vibrometer positioned outside of the enclosure and above the window.

21. A system as defined in claim 18 wherein:

the top cover of the enclosure defines an opening for receiving a probe; and

the means for measuring the dynamic interaction between the first and second disc drive components includes a particle counter having a probe extending through the opening defined in the enclosure, the particle counter operating to suction particles generated by the interaction between the first and second disc drive components.

22. A system as defined in claim 21 wherein the means for measuring the dynamic interaction between the first and second disc drive components further includes a particle trap operating separately from the particle counter.

23. A system as defined in claim 18 wherein:

the means for measuring the dynamic interaction between the first and second disc drive components includes a sample collection disc attached to the hub below the media disc.

24. A system as defined in claim 18 wherein:

the means for measuring the dynamic interaction between the first and second disc drive components includes an acoustical emission sensor attached within the interior volume of the enclosure.