EP0333128A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Linear access mechanism and magnetic disk apparatus
Assignee: Hitachi Ltd
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Filing: 1989-03-14
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Granted: —
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Expires: 2009-03-14
Abstract
Abstract A magnetic disk apparatus capable of reducing the vibration thereof is disclosed, in which a linear access mechanism (4 to 8) for driving a magnetic head (2) is provided with anti-reaction force generating means (11 to 16) for generating an anti-reaction force capable of offsetting a reaction force generated in driving a carriage (4) mounted with the magnetic head (2).
Inventors
- 👤 Naoki Tsukuba Hausu 14-101 Maeda
- 👤 Yozo Nakamura
- 👤 Yuzo Tsukuba Hausu 13-302 Kadomukai
- 👤 Shunichi Mitsuya
- 👤 Tsuyoshi Takahashi
- 👤 Jun Naruse
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 14:15
CPC Classifications
G; G11; G11B; G11B21/00; G11B21/02; G11B21/08; G11B25/00; G11B25/04; G11B33/00; G11B33/02; G11B33/08; G11B5/00; G11B5/48; G11B5/54; G11B5/55; G11B5/5521
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
119 words
A linear access mechanism including a carriage (4) capable of moving linearly on a guide surface, a guide mechanism (6) for guiding the carriage, a voice-coil motor (7) for causing the carriage to make a linear reciprocating motion, and a base (8) for supporting the guide mechanism and the voice-coil motor, the linear access mechanism comprising anti-reaction force generating means (10 to 16; 13, 19, 21; 13, 22, 23; 13, 22, 26) for generating an anti-reaction force capable of offsetting the reaction force of a driving force for driving the carriage, the point of action of the anti-reaction force being laid on a straight line indicative of a direction, in which the driving force is applied to the carriage.
Claim 2
Dependent Claim
119 words
A linear access mechanism including a carriage (4) capable of moving linearly on a guide surface, a guide mechanism (6) for guiding the carriage, a voice-coil motor (7) for causing the carriage to make a linear reciprocating motion, and a base (8) for supporting the guide mechanism and the voice-coil motor, the linear access mechanism comprising anti-reaction force generating means (10 to 16; 13, 19, 21; 13, 22, 23; 13, 22, 26) for generating an anti-reaction force capable of offsetting the reaction force of a driving force for driving the carriage, the point of action of the anti-reaction force being laid on a straight line indicative of a direction, in which the driving force is applied to the carriage.
Claim 3
Dependent Claim
125 words
A linear access mechanism including a carriage (4) capable of moving linearly on a guide surface, a guide mechanism (6) for guiding the carriage, a voice-coil motor (7) for causing the carriage to make a linear reciprocating motion, and a base (8) for supporting the guide mechanism and the voice-coil motor, the linear access mechanism comprising: means for detecting the acceleration of a driving part of the linear access mechanism generated by driving the carriage; and anti-reaction force generating means (10 to 16; 13, 19, 21; 13, 22, 23; 13, 22, 26) for evaluating the reaction force of a driving force for driving the carriage, from the detected acceleration, and for generating a force equal in magnitude and opposite in direction to the reaction force.
Claim 4
Dependent Claim
125 words
A linear access mechanism including a carriage (4) capable of moving linearly on a guide surface, a guide mechanism (6) for guiding the carriage, a voice-coil motor (7) for causing the carriage to make a linear reciprocating motion, and a base (8) for supporting the guide mechanism and the voice-coil motor, the linear access mechanism comprising: means for detecting the acceleration of a driving part of the linear access mechanism generated by driving the carriage; and anti-reaction force generating means (10 to 16; 13, 19, 21; 13, 22, 23; 13, 22, 26) for evaluating the reaction force of a driving force for driving the carriage, from the detected acceleration, and for generating a force equal in magnitude and opposite in direction to the reaction force.
Claim 5
Dependent Claim
48 words
A linear access mechanism according to Claim 1, wherein the anti-reaction force generating means includes a reaction carriage (11) moving in a direction opposite to the moving direction of the carriage (4), and a voice-coil motor (14) for causing the reaction carriage to make a linear reciprocating motion.
Claim 6
Dependent Claim
123 words
A linear access mechanism including a carriage (4) capable of moving linearly on a guide surface, a guide mechanism (6) for guiding the carriage, a voice-coil motor (7) for causing the carriage to make a linear reciprocating motion, and a base (8) for supporting the guide mechanism and the voice-coil motor, the linear access mechanism comprising: means for detecting the acceleration of a driving part of the linear access mechanism generated in driving the carriage; and anti-reaction force generating means (10 to 16; 13, 19, 21; 13, 22, 23; 13, 22, 26) for applying an anti- reaction force to the driving part so that the derivative of the acceleration of the driving part with respect to time is a continuous function of time.
Claim 7
Dependent Claim
123 words
A linear access mechanism including a carriage (4) capable of moving linearly on a guide surface, a guide mechanism (6) for guiding the carriage, a voice-coil motor (7) for causing the carriage to make a linear reciprocating motion, and a base (8) for supporting the guide mechanism and the voice-coil motor, the linear access mechanism comprising: means for detecting the acceleration of a driving part of the linear access mechanism generated in driving the carriage; and anti-reaction force generating means (10 to 16; 13, 19, 21; 13, 22, 23; 13, 22, 26) for applying an anti- reaction force to the driving part so that the derivative of the acceleration of the driving part with respect to time is a continuous function of time.
Claim 8
Dependent Claim
87 words
A linear access mechanism according to Claim 4, wherein the anti-reaction force generating means includes a laminated electrostrictive element (21) attached to the voice-coil motor (7), a weight member (19) bonded to the laminated electrostrictive element so that the laminated electrostrictive element is interposed between the voice-coil motor and the weight member, and a drive circuit (13) for driving the laminated electrostrictive element in accordance with a reaction force which is applied to the voice-coil motor as the reaction of a driving force for driving the carriage.
Claim 9
Dependent Claim
71 words
A magnetic disk apparatus including a reaction-force reducing device for reducing the reaction force of a driving force by applying a force which is opposite in phase to the reaction force, to an access mechanism, wherein the reaction-force reducing device includes at least a pair of electrostrictive elements (24), a weight member (25) provided between the electrostrictive elements and held movably, and a drive circuit (27) for driving the electrostrictive elements.
Claim 10
Dependent Claim
71 words
A magnetic disk apparatus including a reaction-force reducing device for reducing the reaction force of a driving force by applying a force which is opposite in phase to the reaction force, to an access mechanism, wherein the reaction-force reducing device includes at least a pair of electrostrictive elements (24), a weight member (25) provided between the electrostrictive elements and held movably, and a drive circuit (27) for driving the electrostrictive elements.
Claim 11
Dependent Claim
19 words
A magnetic disk apparatus according to Claim 6, wherein each of the electrostrictive elements is a laminated electrostrictive element.
Claim 12
Dependent Claim
21 words
A magnetic disk apparatus according to Claim 6, wherein each of the electrostrictive elements is replaced by a shape memory alloy.
Claim 13
Dependent Claim
21 words
A magnetic disk apparatus according to Claim 6, wherein the reaction-force reducing device includes a plurality of pairs of electrostrictive elements.
Claim 14
Dependent Claim
49 words
A magnetic disk apparatus according to Claim 9, wherein the same weight member is arranged between each pair of electrostrictive elements, and an electrostrictive element group on one side of the weight member is driven earlier than an electrostrictive element group on the other side of the weight member.
References Cited (Backward Citations)
No citation records indexed.
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