Magnetic media test fixture apparatus

• US 4,504,871 A
• Filed: 01/25/1982
• Issued: 03/12/1985
• Est. Priority Date: 01/08/1980
• Status: Expired due to Fees

• Current Assignee: Verbatim Corporation (Mitsubishi Chemical Group Corp.)
• Original Assignee: Verbatim Corporation (Mitsubishi Chemical Group Corp.)
• Inventors: Lam, Kyle T., Berwick, James D.
• Primary Examiner(s): PSITOS, ARISTOTELIS
• Application Number:
  US06/342,124
• Time in Patent Office: 1,142 Days
• Field of Search: 360/31, 360/135, 360/137, 324/210, 324/212
• US Class Current: 360/31
• CPC Class Codes: G11B 20/1816 Testing
• CPC Class Codes: G11B 5/012 Recording on, or reproducing or erasing from, magnetic disks G11B17/00, G11B19/00 take precedence

Abstract

A test fixture apparatus for testing drives of magnetic recording media; the apparatus being adapted to simulate magnetic media for insertion within a magnetic recording drive. The test fixture apparatus includes a structure formed with exterior dimensions approximating those of the magnetic media; one or more conductors positioned to be in close proximity to the gap or gaps of the magnetic recording head within the drive when the test fixture apparatus is inserted; signal detection and driver circuitry to drive the conductor or conductors in order to simulate readback flux reversals and to check write characteristics of the drive; and means to simulate index pulses for flexible disk applications. A magnetic data cartridge application is also included as an alternative embodiment.

Claims

1. A test apparatus for testing a plurality of functions of a read/write head of a flexible disk drive of a disk magnetic storage system, the apparatus comprising:

a housing means fabricated of a rigid material and having dimensions congruent to an outer jacket of a flexible disk assembly, the housing means including a central aperture for a spindle of a disk drive, and further including an oblong read aperture radially arrayed about a first edge of the housing and a circular index sensing aperture positioned near to said oblong read/write aperture;

an electrical conductor affixed to the housing means and centrally arrayed about a long axis of said oblong read aperture, the conductor being positioned to be in close proximity to a read/write head within the disk drive when the housing means is inserted within the disk drive;

signal generating means positioned remotely to the housing means and electrically connected by a conductive cable to the conductor for supplying electrical signals within the recording frequency range of between 120 kilohertz and 250 kilohertz, whereby a plurality of electrical parameters of the read/write head may be tested when the housing means is inserted within the disk drive, the signal generating means further including means for generating strobing signals; and

motion simulation means for actuating said read/write head whereby said read/write head will receive signals from the conductor, the motion simulation means including a first light source mounted on the housing means about said index sensing aperture and coupled to the signal generating means, said light source being strobed in accordance with said strobing signals to actuate a light receptive disk drive sensor to simulate rotation of a flexible magnetic disk inserted within said drive, whereby said disk drive is enabled.

2. The test apparatus of claim 1, further comprising:

signal detection means positioned remotely to the housing means and electrically coupled through said conductive cable to said conductor, the signal detector means being adapted to detect and measure a signal output of said read/write head of said magnetic recording drive device.

3. The test apparatus of claim 1, wherein,

the conductor is a planar ribbon conductor.

4. The test apparatus of claim 1 further comprising;

a second light source attached to the housing means and positioned to excite a light receptor located within said flexible disk drive when the housing means is inserted therewithin whereby said second light source prevents said flexible disk drive from performing a write function.

5. A test apparatus for testing a plurality of functions of a read/write head of a magnetic data cartridge drive of a cartridge magnetic data storage system, the apparatus comprising:

a housing means fabricated of a rigid material and congruent in shape and dimensions to a magnetic data cartridge;

an electrical conductor, affixed to the housing means and positioned to be in close proximity to said read/write head when the housing means is inserted within said magnetic cartridge drive;

signal generating means positioned remotely to the housing means and electrically connected by a conductive cable to the conductor for supplying electrical signals within the recording frequency range of between 125 and 250 kilohertz whereby a plurality of electrical parameters of said magnetic read/write head may be tested when the housing means is inserted within said magnetic drive device; and

motion simulation means for actuating said read/write head whereby said head will receive signals from said conductor, the motion simulation means including a light source positioned within said housing means and adapted to illuminate a light receptive motion detection element within said magnetic data cartridge drive so as to simulate an end-of-tape and a beginning-of-tape condition within said magnetic data cartridge drive when said housing is inserted therewithin.

6. The test apparatus of claim 5, further comprising:

a rotatable hub located within the housing means and positioned to engage and be driven by a capstan within said magnetic data cartridge drive when said cartridge is fully inserted therein, and;

measuring means for measuring the rotational rate of said hub, the measuring means located within the housing.

7. The test apparatus of claim 5, wherein

said conductor comprises a plurality of conductive elements affixed to a resilient backing, said plurality of conductive elements being positioned about the housing means to be in close proximity to said read/write head when said magnetic data cartridge is inserted into said magnetic data cartridge drive.