Patent US4602848A successfully refreshed from Google Patents.
US4602848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical apparatus with 5-degree of-freedom positioning device
Assignee: US Philips Corp
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Filing: 1985-05-31
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Granted: 1986-07-29
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Expires: 2005-05-31
Abstract
Abstract A positioning device for positioning an element, such as an optical element used to direct a radiation beam with respect to tracks on a carrier, with respect to translation along three mutually perpendicular axes and pivoting about two of those axes. Two sets of coils are disposed one at each end of a permanent magnet structure, each set having at least three coils having axes generally parallel to the structure axis, and arranged to co-act with the external return field of the magnet structure such that selective electrically energizing of two or more of the coils will produce a reaction force in the structure for positioning the structure in one or more of the selected degrees of freedom.
Inventors
- 👤 Leo Honds
- 👤 Karl H. Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:05
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/08; G11B7/09; G11B7/0925; G11B7/0935
Claims Analysis
Total Claims: 38
Claim 1
Independent Claim
128 words
An optical apparatus for deflecting or positioning a radiation beam relative to recording and reproducing tracks in an information carrier, which apparatus comprises an objective, and a positioning device for continually correcting the objective position relative to the information character, said positioning device comprising an adjustable objective support which is responsive to a magnetic field and stationary coils which are electrically energized, characterized in that the objective support comprises a permanent magnet sleeve defining an axis and having magnet poles; and said stationary coils comprise two axially spaced sets of coils arranged in the external field of the magnet sleeve, such that the coil fields at the respective axial sleeve ends act on the sleeve with control components in three mutually perpendicular directions in conformity with their energization.
Claim 2
Dependent Claim
128 words
An optical apparatus for deflecting or positioning a radiation beam relative to recording and reproducing tracks in an information carrier, which apparatus comprises an objective, and a positioning device for continually correcting the objective position relative to the information character, said positioning device comprising an adjustable objective support which is responsive to a magnetic field and stationary coils which are electrically energized, characterized in that the objective support comprises a permanent magnet sleeve defining an axis and having magnet poles; and said stationary coils comprise two axially spaced sets of coils arranged in the external field of the magnet sleeve, such that the coil fields at the respective axial sleeve ends act on the sleeve with control components in three mutually perpendicular directions in conformity with their energization.
Claim 3
Dependent Claim
30 words
An apparatus as claimed in claim 1, characterized in that each said set comprises at least three coils arranged outside the sleeve in transverse planes near a respective sleeve end.
Claim 4
Dependent Claim
18 words
An apparatus as claimed in claim 2, characterized in that the coils are constructed as flat air-core coils.
Claim 5
Dependent Claim
25 words
An apparatus as claimed in claim 1, characterized by comprising a coil housing having a hollow tubular core in which the sleeve is freely suspended.
Claim 6
Dependent Claim
50 words
An apparatus as claimed in claim 4, characterized in that the coils are constructed as coil preforms having axes generally parallel to said sleeve axis, said preforms having a shape adapted to the three-dimensional shape of the permanent magnetic field in such a way that the Lorentz force is maximal.
Claim 7
Dependent Claim
15 words
An apparatus as claimed in claim 5, characterized in that the sleeve is magnetized inhomogeneously.
Claim 8
Dependent Claim
29 words
An apparatus as claimed in claim 6, characterized in that the sleeve comprises two permanently magnetized axial portions, and an intermediate portion disposed between said two permanently magnetized portions.
Claim 9
Dependent Claim
19 words
An apparatus as claimed in claim 7, characterized in that said intermediate portion is formed of a non-magnetic material.
Claim 10
Dependent Claim
50 words
An apparatus as claimed in claim 1, characterized in that the coils are constructed as coil preforms having axes generally parallel to said sleeve axis, said preforms having a shape adapted to the three-dimensional shape of the permanent magnetic field in such a way that the Lorentz force is maximal.
Claim 11
Dependent Claim
33 words
An apparatus as claimed in claim 9, characterized in that the permanent-magnetic sleeve is of polygonal cross-section and the shapes of the associated coils are adapted to the shape of the polygonal sleeve.
Claim 12
Dependent Claim
15 words
An apparatus as claimed in claim 10, characterized in that the sleeve is magnetized inhomogeneously.
Claim 13
Dependent Claim
29 words
An apparatus as claimed in claim 11, characterized in that the sleeve comprises two permanently magnetized axial portions, and an intermediate portion disposed between said two permanently magnetized portions.
Claim 14
Dependent Claim
19 words
An apparatus as claimed in claim 12, characterized in that said intermediate portion is formed of a non-magnetic material.
Claim 15
Dependent Claim
33 words
An apparatus as claimed in claim 1, characterized in that the permanent-magnetic sleeve is of polygonal cross-section and the shapes of the associated coils are adapted to the shape of the polygonal sleeve.
Claim 16
Dependent Claim
27 words
An apparatus as claimed in claim 14, characterized in that the backs of the coils are arranged in a field area where the field strength is minimal.
Claim 17
Dependent Claim
15 words
An apparatus as claimed in claim 15, characterized in that the sleeve is magnetized inhomogeneously.
Claim 18
Dependent Claim
29 words
An apparatus as claimed in claim 16, characterized in that the sleeve comprises two permanently magnetized axial portions, and an intermediate portion disposed between said two permanently magnetized portions.
Claim 19
Dependent Claim
19 words
An apparatus as claimed in claim 17, characterized in that said intermediate portion is formed of a non-magnetic material.
Claim 20
Dependent Claim
33 words
An apparatus as claimed in claim 1, characterized by comprising a coil housing having a hollow tubular core in which the sleeve is freely suspended, and in that the sleeve is magnetized inhomogeneously.
Claim 21
Dependent Claim
29 words
An apparatus as claimed in claim 19, characterized in that the sleeve comprises two permanently magnetized axial portions, and an intermediate portion disposed between said two permanently magnetized portions.
Claim 22
Dependent Claim
19 words
An apparatus as claimed in claim 20, characterized in that said intermediate portion is formed of a non-magnetic material.
Claim 23
Dependent Claim
23 words
An apparatus as claimed in claim 1, characterized in that the magnetic poles of the axially magnetized sleeve are located on its faces.
Claim 24
Dependent Claim
30 words
An apparatus as claimed in claim 22, characterized in that each said set comprises at least three coils arranged outside the sleeve in transverse planes near a respective sleeve end.
Claim 25
Dependent Claim
40 words
An apparatus as claimed in claim 23, characterized in that the coils are arranged in a cylindrical configuration around the sleeve circumference, and the backs of the coils are arranged in a field area where the field strength is minimal.
Claim 26
Dependent Claim
40 words
An apparatus as claimed in claim 1, characterized in that the coils are arranged in a cylindrical configuration around the sleeve circumference, and the backs of the coils are arranged in a field area where the field strength is minimal.
Claim 27
Dependent Claim
15 words
An apparatus as claimed in claim 1, characterized in that the sleeve is magnetized inhomogeneously.
Claim 28
Dependent Claim
29 words
An apparatus as claimed in claim 26, characterized in that the sleeve comprises two permanently magnetized axial portions, and an intermediate portion disposed between said two permanently magnetized portions.
Claim 29
Dependent Claim
19 words
An apparatus as claimed in claim 27, characterized in that said intermediate portion is formed of a non-magnetic material.
Claim 30
Dependent Claim
76 words
A five-degree-of-freedom positioning device for an element, comprising a permanent magnet structure defining an axis and having magnetic poles, said element being mounted to said structure, and two axially spaced sets of coils arranged in the external return field of the magnet structure such that the coil fields at respective axial ends of the structure act on the structure with control components in three mutually perpendicular directions in conformity with the energization of the respective coils.
Claim 31
Dependent Claim
76 words
A five-degree-of-freedom positioning device for an element, comprising a permanent magnet structure defining an axis and having magnetic poles, said element being mounted to said structure, and two axially spaced sets of coils arranged in the external return field of the magnet structure such that the coil fields at respective axial ends of the structure act on the structure with control components in three mutually perpendicular directions in conformity with the energization of the respective coils.
Claim 32
Dependent Claim
51 words
A device as claimed in claim 29, characterized in that said structure has two end faces each perpendicular to the axis, the magnet poles being located in the respective faces, and each said set comprises at least three coils arranged outside the structure in transverse planes near a respective structure end.
Claim 33
Dependent Claim
40 words
An apparatus as claimed in claim 29, characterized in that the coils are arranged in a cylindrical configuration around the structure circumference, and the backs of the coils are arranged in a field area where the field strength is minimal.
Claim 34
Dependent Claim
15 words
An apparatus as claimed in claim 31, characterized in that the structure is magnetized inhomogeneously.
Claim 35
Dependent Claim
30 words
An apparatus as claimed in claim 32, characterized in that the structure comprises two permanently magnetized axial portions, and an non-magnetic intermediate portion disposed between said two permanently magnetized portions.
Claim 36
Dependent Claim
15 words
An apparatus as claimed in claim 29, characterized in that the structure is magnetized inhomogeneously.
Claim 37
Dependent Claim
30 words
An apparatus as claimed in claim 34, characterized in that the structure comprises two permanently magnetized axial portions, and an non-magnetic intermediate portion disposed between said two permanently magnetized portions.
Claim 38
Dependent Claim
33 words
An apparatus as claimed in claim 29, characterized in that the permanent-magnetic structure is of polygonal cross-section and the shapes of the associated coils are adapted to the shape of the polygonal structure.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-28 | 1990-01-27 | 1990-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-28 | 1994-01-27 | 1994-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-28 | 1998-01-27 | 1998-07-29 | $7700.00 | Window Closed / Lapsed |