Disk drive test chamber

• US 5,851,143 A
• Filed: 05/10/1996
• Issued: 12/22/1998
• Est. Priority Date: 05/10/1996
• Status: Expired due to Fees

• Current Assignee: Thermal Industries, Inc. (Cornerstone Building Brands, Inc.)
• Original Assignee: Thermal Industries, Inc. (Cornerstone Building Brands, Inc.)
• Inventors: Hamid, Lotfizadeh S.
• Primary Examiner(s): Joyce, Harold
• Application Number:
  US08/644,534
• Time in Patent Office: 956 Days
• Field of Search: 454/57, 454/58, 454/187, 454/228, 454/229, 454/236, 34/213, 34/215, 34/225, 312/236, 312/116, 312/118
• US Class Current: 454/57
• CPC Class Codes: F24F 11/76 by means responsive to temperature, e.g. bimetal springs
• CPC Class Codes: G01N 17/002 Test chambers
• CPC Class Codes: G01R 31/2849 Environmental or reliability testing, e.g. burn-in or validation tests of individual semiconductors G01R31/2642; of printed circuits boards G01R31/2817; of IC's G01R31/2855
• CPC Class Codes: G11B 33/128 of the plurality of recording/reproducing devices, e.g. disk drives, onto a chassis
• CPC Class Codes: G11B 33/144 by detection, control, regulation of the temperature

Abstract

A disk drive test chamber creates an environment for disk drives to be tested with an air circulation system that provides an even flow of air over each drive for equivalence in testing conditions. One method of providing equivalent air circulation is to have turning vanes inside air ducts to divert equal amounts of air over each shelf holding disk drives through identically sized apertures. The second method is to have apertures of varying sizes of 40, 50 and 70 percent opening per square inch in the air ducts to divert equal amounts of air. The temperature is maintained within 1/4° C. of the set point by a controller through a system of heaters, air pumps, air ducts, insulation, vents, a motorized damper and an exhaust fan. The heater generates heat to simulate the actual heat of running conditions of disk drives. The pumps send air up the side air ducts and down the center air duct. The chamber has two safety features to prevent damage to the disk drives from over temperature. Four separate techniques are employed to minimize vibration to the disk drives being tested; a steel frame, a rubber air duct transition, and neoprene pads on the brackets holding the shelves and on the leveling feet.

Claims

1. A device for testing disk drives comprising:

a test bay having a right side, a left side, a ceiling and a floor, the test bay being adapted for housing a plurality of shelves for holding a plurality of disk drives in the test bay, and the test bay being maintainable in a predetermined temperature range;

at least one heater located below the test bay for heating the test bay;

a left air duct and a right air duct positioned on the right and left sides of the test bay for supplying air in an upward direction, the left and right air ducts having air duct covers;

at least one pump for pumping air up the left and right air ducts;

a central air duct located in the center of the test, the central air duct extending from the floor of the test bay to the ceiling of the test bay and separating the test bay into a right half and a left half, the central air duct being for returning the supply of the air in a downward direction toward the pump, the central air duct having at least one central air duct cover;

the left air duct, the right air duct and the central air duct each having a hollow interior with a plurality of turning vanes positioned in the hollow interior for balancing the air flow to various regions of the test bay;

a front lower panel positioned below the test bay and including at least one air intake vent;

a motorized damper positioned below the test bay for drawing in air through the air intake vent;

an exhaust fan positioned on the test bay for expelling air from inside the test bay; and

perforations in the air duct covers of the left and right air ducts and equivalent perforations in the central air duct cover for balancing air flow to various regions inside the test bay.

2. The device according to claim 1 further comprising thermal insulation in the test bay for improving temperature control.

3. The device according to claim 1 wherein the predetermined temperature range is within 1/4°

C. of a set point, the set point being within the range of room temperature to 75°

C.

4. The device according to claim 1 wherein the air duct covers and the central air duct cover have brackets for supporting a plurality of shelves and vibration dampening pads attached to the brackets for minimizing the contact between the brackets and the shelves.

5. The device according to claim 1 further comprising an air duct transition connecting the pump and the left air duct for transferring air from the pump to the left air duct, the point of connection of the air duct transition to the pump having a vibration dampening pad for minimizing translation of the vibration from the pump to the left air duct.

6. The device according to claim 1 further comprising leveling feet for leveling the device, the leveling feet having vibration dampening pads for minimizing vibration translation from the floor of the room containing the device to the device.

7. The device according to claim 3 wherein all power to the device shuts down when the temperature of the test bay is 7°

C. higher than the set point.

8. The device according to claim 1 further comprising a controller that activates and deactivates the heater and the pump.