Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
60 words
In a disc drive system for reading data from a disc (a) a head for reading data tracks which are radially spaced from each other on said disc; (b) means for radially moving said head relative to said disc; and (c) to compensate for the thermal expansion of said radial head moving means relative to said tracks on said disc.
Claim 2
Dependent Claim
60 words
In a disc drive system for reading data from a disc (a) a head for reading data tracks which are radially spaced from each other on said disc; (b) means for radially moving said head relative to said disc; and (c) to compensate for the thermal expansion of said radial head moving means relative to said tracks on said disc.
Claim 3
Dependent Claim
51 words
A disc drive system as claimed in Claim 1 wherein (a) said means for radially moving said head comprise a carriage for carrying said head; (b) motor means for radially driving said carriage relative to said disc; and (c) said thermal compensation plate being inserted between said motor and said head.
Claim 4
Dependent Claim
22 words
A disc drive system as claimed in Claim 2 wherein said thermal compensating plate is connected between said carriage and said motor.
Claim 5
Dependent Claim
75 words
A disc drive system as claimed in Claim 3 wherein (a) said motor drives said carriage through a band wound about the motor capstan and connected to said carriage; (b) said thermal compensating plate being connected between said band and said carriage, said plate having a coefficient of thermal expansion along an axis parallel to said radial direction of movement to compensate for said thermal expansion of said head moving means relative to said tracks.
Claim 6
Dependent Claim
131 words
A disc drive system as claim in Claim 3 wherein (a) a radially movable head for reading data tracks which are radially spaced from each other on said disc; (b) a head actuator means for radially moving said head; (c) motor means mounted on said housing and coupled to said actuator for positioning said actuator; (d) said disc, housing and actuator comprising elements of a thermal circuit, each of said elements having an effective thermal coefficient of expansion determined by the material and size of said element, and including a thermal compensation element incorporated in said thermal circuit, said element having a coefficient of thermal expansion and size selected to offset thermal expansion imbalance due to the elements of said thermal circuit to maintain alignment of said head and said tracks.
Claim 7
Dependent Claim
60 words
A disc drive system as claimed in Claim 8 said actuator comprising a carriage for carrying said head into alignment with said tracks and pulley means responsive to said motor for moving said carriage, said pulley having a material and length selected to offset a linear portion of said thermal imbalance between an inner and outer track of said disc.
Claim 8
Dependent Claim
134 words
In a disc drive system for reading data from a disc enclosed with a housing, (a) a radially movable head for reading data tracks which are radially spaced from each other on said disc; (b) a head actuator means for radially moving said head; (c) motor means mounted on said housing and coupled to said actuator for positioning said actuator; (d) said disc, housing and actuator comprising elements of a thermal circuit, each of said elements having an effective thermal coefficient of expansion determined by the material and size of said element, a method of balancing said thermal circuit to reduce misalignment between said head and said tracks incorporating a thermal compensation element in said thermal circuit, including selectin the material and size of said compensatiion element to off expansion imbalance in said circuit.
Claim 9
Dependent Claim
134 words
In a disc drive system for reading data from a disc enclosed with a housing, (a) a radially movable head for reading data tracks which are radially spaced from each other on said disc; (b) a head actuator means for radially moving said head; (c) motor means mounted on said housing and coupled to said actuator for positioning said actuator; (d) said disc, housing and actuator comprising elements of a thermal circuit, each of said elements having an effective thermal coefficient of expansion determined by the material and size of said element, a method of balancing said thermal circuit to reduce misalignment between said head and said tracks incorporating a thermal compensation element in said thermal circuit, including selectin the material and size of said compensatiion element to off expansion imbalance in said circuit.
Claim 10
Dependent Claim
35 words
A system as claimed in Claim 9 or Claim 10, wherein said compensating element is of a material selected from a group of materials having a higher or lower thermal coefficient of expansion than aluminum.