Air bladder apparatus for positioning a magnetic head
First Claim
1. A magnetic head load-unload device for use with an actuator in the recording and reading of information on a magnetic disk, comprising,a support arm,means for suspending a transducer from said support arm,a transducer coupled to said suspension means, said transducer having a load position and an unload position relative to said support arm, movement of said transducer from said unload position to said load position having the effect of placing to said load position having the effect of placing the transducer in data transfer engagement with a magnetic disk,biasing means for exerting a force with relation to said suspension means in a manner to urge said transducer into one of said load and unload positions,an elastically expandable pneumatic bladder operatively coupled to said biasing means such that expansion of said pneumatic bladder provides a of said pneumatic bladder providing a force to overcome said biasing means, thereby moving said transducer to the other of said load and unload positions, andgas supply means for selectively inflating said pneumatic bladder.
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Accused Products
Abstract
In an actuator for the recording and reading of information on a magnetic memory disk of the type having a pair of flexures suspended from a support arm, a low mass pneumatic apparatus for bringing a magnetic head into proximity with a disk. The support arm includes upper and lower bodies which are spaced apart to straddle a magnetic memory disk. Each of the support arm bodies is fixed to one end of a flexure. The end of each flexure opposite the support arm bodies has a read/write head. The flexures and heads are spring biased into an unload position away from the magnetic memory disk. Independent gas impermeable elastic bladders are operatively coupled to the support arm bodies and the flexure members to exert a force which bends the flexures relative to the support arm. Expansion of the elastic bladders provide a force which exceeds the spring biasing, thereby moving the heads into a load position in data transfer engagement with the magnetic disk. The elastic bladders and the head suspension assembly provide a low mass load-unload device.
22 Citations
18 Claims
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1. A magnetic head load-unload device for use with an actuator in the recording and reading of information on a magnetic disk, comprising,
a support arm, means for suspending a transducer from said support arm, a transducer coupled to said suspension means, said transducer having a load position and an unload position relative to said support arm, movement of said transducer from said unload position to said load position having the effect of placing to said load position having the effect of placing the transducer in data transfer engagement with a magnetic disk, biasing means for exerting a force with relation to said suspension means in a manner to urge said transducer into one of said load and unload positions, an elastically expandable pneumatic bladder operatively coupled to said biasing means such that expansion of said pneumatic bladder provides a of said pneumatic bladder providing a force to overcome said biasing means, thereby moving said transducer to the other of said load and unload positions, and gas supply means for selectively inflating said pneumatic bladder.
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7. A magnetic head load-unload device for use with an actuator in recording and reading of information on a magnetic disk, comprising,
a support arm, a head suspension assembly attached to said support arm, a read/write head fixed to said head suspension assembly, biasing means for exerting a force on said head suspension assembly to urge said head suspension assembly to pivot into a rest condition with respect to said support arm, said rest condition being one of a load position in which said read/write head is in data transfer engagement with a magnetic disk, having an unload position, removed from said data transfer engement, a gas impermeable expandable ladder operatively coupled to said support arm and said head suspension assembly to displace said head suspension assembly relative to said support arm, expansion of said bladder having a force to pivot said head suspension assembly from said rest condition, and gas supply means for selectively inflating said bladder.
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14. An actuator for recording and reading of information on a magnetic disk comprising,
an actuator housing, a support arm fixed to said actuator housing for movement within a horizontal plane, said support arm having upper and lower longitudinally extending bodies spaced apart at one end to straddle a magnetic disk, a first head suspension assembly attached to said upper body of the support arm, a first read/write head fixed to said first head suspension assembly, said first head suspension assembly having a load position in which said first read/write head is in data transfer engagement with said magnetic disk and having an unload position, said first head suspension assembly biased into said unload position, a first gas impermeable elastic bladder operatively coupled to said support arm and said head suspension assembly to exert a force displacing said first suspension assembly relative to said support arm, expansion of said first elastic bladder providing a force exceeding the bias of said first head suspension assembly, thereby moving said first head suspension assembly into said load position, a second head suspension assembly attached to said lower body and having a load position relative to said support arm and to said magnetic disk, said second head suspension assembly biased in an unload position, a second read/write head fixed to said second head suspension assembly in an orientation opposite the orientation of said first read/write head, a second gas impermeable elastic bladder operatively coupled to said support arm and said second head suspension assembly to exert a force displacing said second head suspension assembly relative to said support arm, expansion of said second elastic bladder providing a force exceeding the bias of said second head suspension assembly, thereby moving said second head assembly into said load position, and gas supply means for selectively and independently inflating said first and second elastic bladders.
Specification