The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 08, 2002
Filed:
Nov. 06, 1995
Narayanaswamy Pasupathy, San Jose, CA (US);
Long Van Ngo, San Jose, CA (US);
Mark Joseph Fernandes, Santa Cruz, CA (US);
Ramgopal Battu, Canoga Park, CA (US);
Seagate Technology LLC, Scotts Valley, CA (US);
Abstract
An improved latch system for use in a disc drive is provided including an improved means for eliminating tolerances in the parked position of the actuator arm in the landing zone on the disc. According to this system, the latch system includes latch arm having a rotary engaging portion which engages a portion of the transducer support arm or actuator arm in the disc drive to prevent movement of the transducer when the shock appears; this latch arm is directly coupled to an air vane which extends parallel to the edge of the disc in a region nearly adjacent to the actuator arm and at a distance at a center of the disc which is just greater than the radius of the disc so that the vane extends partially along an arc or a line near to the edge of the disc. The latch arm and vane are arranged so that in the presence of disc rotation, wind generated by the disc presses against the vane, and the vane moves away from the disc. As it does so, the latch arm disengages the actuator arm, allowing it to move freely back and forth over the surface of the disc to locate the transducer over various tracks. When disc rotation ceases, the vane returns to its position adjacent the edge of the disc, and the transducer arm returns the transducer to the landing zone. When it does so, a pin which rises above the surface of the actuator arm engages the end of the latch arm. This pin rests against the end of the actuator arm and prevents further movement of the actuator arm under shock. Under normal conditions the accumulated tolerances between the final position of the wind vane, the latch arm, the pin, and the actuator arm which supports the pin would all need to be allowed for in defining the landing zone of the arm. According to the present invention however, an adjustable cam pin having a variable outer radius is supported on the actuator arm. When the assembly of the latch arm and actuator arm are complete the pin is rotated so that it rests firmly against the end of the latch arm; in this position, when the wind vane is at rest, the transducer supporting actuator arm rests exactly on the predefined landing zone, and assembly tolerances which would normally have to be incorporated into the landing zone can be eliminated.