Patent EP0069546A2 successfully refreshed from Google Patents.
EP0069546A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Head arm and control system therefor
Assignee: Irwin International Inc
•
Filing: 1982-07-01
•
Granted: —
•
Expires: 2002-07-01
Abstract
Abstract A head arm (25) includes a pick-up head (18) at one end (22) and a pivot (24) for mounting the arm to a base (12) at a pivot position remote from the one end and spaced from an opposite end (28) with a drive (26) coupled to the arm in the area between the pivot and the opposite end for pivoting the arm to position the pick-up head with respect to a data disk (15). Preferably, the drive is a linear motor having a stator coil (70) embedded in the pick-up arm and field producing magnets (71, 73, 76, 78) mounted to the base. Preferably, also, there is a velocity pick-up coil (72) positioned to detect arm movement and provide, in connection with signals applied to the linear motor, synthesized linear velocity control signals employed for the controlling of the arm position. The arm preferably comprises upper (30) and lower (32) apertured members connected along their outer edges (31) by bridge members (35).
Inventors
- 👤 Juan F. Velazquez
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 13:18
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/54; G11B5/55; G11B5/5521; G11B21/00; G11B21/02; G11B21/08; G11B21/081
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
98 words
A positioner apparatus for carrying a pick-up head (18) and moving such head from one desired position to another, comprising: an elongated arm (25) with means at one end (22) for supporting a pick-up head (18); a base for said arm (12); means (24) for pivotally mounting said arm to said base at a pivot position remote from said one end and spaced from an opposite end (28); and means (26) coupled to said arm in the area between said pivot position and said opposite end for acting upon said arm to pivot it about said pivot position.
Claim 2
Dependent Claim
98 words
A positioner apparatus for carrying a pick-up head (18) and moving such head from one desired position to another, comprising: an elongated arm (25) with means at one end (22) for supporting a pick-up head (18); a base for said arm (12); means (24) for pivotally mounting said arm to said base at a pivot position remote from said one end and spaced from an opposite end (28); and means (26) coupled to said arm in the area between said pivot position and said opposite end for acting upon said arm to pivot it about said pivot position.
Claim 3
Dependent Claim
47 words
Apparatus as claimed in Claim 1 in which the means (26) for pivoting said arm comprises a linear motor having one of a stator (71, 73, 76, 78) or rotor (70) coupled to said base and the other of a stator or rotor coupled to said arm.
Claim 4
Dependent Claim
19 words
Apparatus as claimed in Claim 2 in which the rotor is a first coil (70) coupled to said arm.
Claim 5
Dependent Claim
23 words
Apparatus as claimed in Claim 3 which includes a second coil (72; 116, 118) for providing signals representative of movement of said arm.
Claim 6
Dependent Claim
31 words
Apparatus as claimed in Claim 4 in which the second coil (72) is positioned adjacent the first coil (70) and at least partially within the field produced by the magnet means.
Claim 7
Dependent Claim
66 words
Apparatus as claimed in Claim 4 or Claim 5 in which the means (24) for pivotally mounting said arm to said base includes a pivot shaft (501 and the second coil (116, 118) is fixedly positioned adjacent said pivot shaft, and which includes additional magnet means (122, 124) mounted to said pivot shaft to induce a current in said second coil upon movement of said arm.
Claim 8
Dependent Claim
27 words
Apparatus as claimed in any of Claims 2 to 6 in which the stator is permanent magnet means (71, 73, 76, 78) coupled to said base (12).
Claim 9
Dependent Claim
28 words
Apparatus as claimed in any of the preceding claims in which the arm (25) includes first (30) and second (32) spaced members integrally joined along an edge (31).
Claim 10
Dependent Claim
18 words
Apparatus as claimed in Claim 8 in which the first and second members are tapered along their length.
Claim 11
Dependent Claim
32 words
Apparatus as claimed in Claim 8 or Claim 9 in which the first and second members incline inwardly toward one another in a direction from said edge to an opposite edge (33).
Claim 12
Dependent Claim
42 words
Apparatus as claimed in Claim 8 or Claim 9 or Claim 10 in which the first and second members include a plurality of relief apertures (43) formed therethrough to define a latticework of support arms extending between opposite edges of said members.
Claim 13
Dependent Claim
30 words
Apparatus as claimed in any of Claims 8 to 11 in which the first and second members are joined at said edge by a plurality of spaced bridge members (35).
Claim 14
Dependent Claim
130 words
- 13. A pivot arm (25) for use in holding a pick-up head (18) employed for tracking information on a rotating disk (15), said arm comprising: first (30) and second (32) longitudinally extending members spaced from one another and integrally joined along a common edge (31), said members terminating at a first end (22) adapted to receive a pick-up head, said members further including means (48) remote from said first end for receiving a pivot shaft (50) for the pivotal movement of said arm, and wherein said first (30) and second (32) members are mutually spaced and lie in planes located generally parallel to and on opposite sides of a disk medium (15) so as to overlie said disk when the arm is pivoted toward the centre of the disk.
Claim 15
Dependent Claim
130 words
- 13. A pivot arm (25) for use in holding a pick-up head (18) employed for tracking information on a rotating disk (15), said arm comprising: first (30) and second (32) longitudinally extending members spaced from one another and integrally joined along a common edge (31), said members terminating at a first end (22) adapted to receive a pick-up head, said members further including means (48) remote from said first end for receiving a pivot shaft (50) for the pivotal movement of said arm, and wherein said first (30) and second (32) members are mutually spaced and lie in planes located generally parallel to and on opposite sides of a disk medium (15) so as to overlie said disk when the arm is pivoted toward the centre of the disk.
Claim 16
Dependent Claim
45 words
An arm as claimed in Claim 13 in which the first (30) and second (32) members are generally planar and include a plurality of apertures (43) formed therethrough to define a latticework of arms. (45) extending from said common edge (31) to an opposite edge.
Claim 17
Dependent Claim
34 words
An arm as claimed in Claim 14 in which the apertures (43) are a plurality of pairs of longitudinally extending triangular shaped openings having facing spaced apart edges to define said latticework of arms.
Claim 18
Dependent Claim
37 words
An arm as claimed in Claim 13 or Claim 14 or Claim 15 in which the first (30) and second (321 members are joined along said common edge (31) by a plurality of spaced bridge members (35).
Claim 19
Dependent Claim
39 words
An arm as claimed in any of Claims 13 to 16 which includes an integral arm portion (60) extending outwardly from means (48) for receiving a pivot shaft and adapted to receive drive means (70) for pivoting said arm.
Claim 20
Dependent Claim
116 words
A disk-type drive system having a pivoted head arm (25) carrying a data read/write head (18) thereon, and a control system for controlling the velocity of movement of the head arm comprising: a drive coil (70) for receiving position control signals to move said head arm across a disk-type data medium (15); a velocity signal pick-up coil (72; 116, 118) positioned to detect the head arm velocity and provide signals representative thereof; and circuit means (Figure 11) coupled to said drive coil (70) and to said velocity pick-up coil (72) for summing signals therefrom and for applying the resultant signals to said drive coil, said circuit means including filter means (102, 110) to reduce noise interference.
Claim 21
Dependent Claim
116 words
A disk-type drive system having a pivoted head arm (25) carrying a data read/write head (18) thereon, and a control system for controlling the velocity of movement of the head arm comprising: a drive coil (70) for receiving position control signals to move said head arm across a disk-type data medium (15); a velocity signal pick-up coil (72; 116, 118) positioned to detect the head arm velocity and provide signals representative thereof; and circuit means (Figure 11) coupled to said drive coil (70) and to said velocity pick-up coil (72) for summing signals therefrom and for applying the resultant signals to said drive coil, said circuit means including filter means (102, 110) to reduce noise interference.
Claim 22
Dependent Claim
37 words
A drive system as claimed in Claim 18 in which the filter means includes a low pass filter (102) coupled to said velocity pick-up (72) and a high pass filter (110) coupled to said drive coil (70).
Claim 23
Dependent Claim
25 words
A drive system as claimed in Claim 19 in which the high pass and said low pass filters have a common effective frequency of operation.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.