US4881142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic disc unit employing temperature compensation
Assignee: Canon Electronics Inc
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Filing: 1988-09-30
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Granted: 1989-11-14
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Expires: 2008-09-30
Abstract
Abstract A magnetic head supporting member, on which is mounted a magnetic head for recording and/or reproducing of information on a magnetic disc, is mounted on a magnetic head driving motor through a temperature-compensating member. Owing to the above construction, since each of the length, shape and thermal expansion coefficient of the temperature-compensating member has considerable flexibility in selection, it is possible to obtain an excellent magnetic disc unit in which desired temperature-compensating conditions can be easily obtained without any loss of flexibility in designing of the material, position and length of each constituent member of the magnetic disc unit.
Inventors
- 👤 Masahiro Kato
- 👤 Yuichi Kakuta, deceased
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:49
CPC Classifications
G; G11; G11B; G11B21/00; G11B21/02; G11B21/08; G11B5/00; G11B5/48; G11B5/54; G11B5/55; G11B5/5521; G11B5/5565
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
166 words
A magnetic disc unit comprising: means for driving a magnetic disc; magnetic head means including a first magnetic head and a second magnetic head for recording and/or reproducing information on opposite surfaces of said magnetic disc; magnetic head driving means for transferring said first and second magnetic heads to predetermined position on said magnetic disc; a temperature-compensating member for compensating relative misalignment between said first and second magnetic heads due to a variation in temperature; a first magnetic head supporting member supporting said first magnetic head and being mounted on said magnetic head driving means via said temperature-compensating member; and a second magnetic head supporting member supporting said second magnetic head and being mounted on said magnetic head driving means via said temperature-compensating member, wherein said first and second magnetic head supporting members are mounted on said temperature-compensating member at positions separated from each other by a distance corresponding to the difference in the thermal expansion coefficients of said first and second magnetic head supporting members.
Claim 2
Dependent Claim
166 words
A magnetic disc unit comprising: means for driving a magnetic disc; magnetic head means including a first magnetic head and a second magnetic head for recording and/or reproducing information on opposite surfaces of said magnetic disc; magnetic head driving means for transferring said first and second magnetic heads to predetermined position on said magnetic disc; a temperature-compensating member for compensating relative misalignment between said first and second magnetic heads due to a variation in temperature; a first magnetic head supporting member supporting said first magnetic head and being mounted on said magnetic head driving means via said temperature-compensating member; and a second magnetic head supporting member supporting said second magnetic head and being mounted on said magnetic head driving means via said temperature-compensating member, wherein said first and second magnetic head supporting members are mounted on said temperature-compensating member at positions separated from each other by a distance corresponding to the difference in the thermal expansion coefficients of said first and second magnetic head supporting members.
Claim 3
Dependent Claim
18 words
The magnetic disc unit as claimed in claim 1, wherein said temperature-compensating member is made of polycarbonate resin.
Claim 4
Dependent Claim
33 words
The magnetic disc unit as claimed in claim 1, wherein said first magnet head supporting member and said second magnetic head supporting member have small thermal expansion coefficients which are substantially the same.
Claim 5
Dependent Claim
29 words
The magnetic disc unit as claimed in claim 1, wherein said first magnetic head supporting member and said second magnetic head supporting member are made of partially different metals.
Claim 6
Dependent Claim
37 words
The magnetic disc unit as claimed in claim 1, wherein said driving means drives a plurality of magnetic discs: and said magnetic head means comprises a plurality of pairs of said first and said second magnetic heads.
Claim 7
Dependent Claim
44 words
The head access unit as claimed in claim 1, further comprising a plurality of supporting members, each of said supporting members being interposed between each of said heads and said compensating means, and each of said supporting members having substantially the same thermal properties.
Claim 8
Dependent Claim
19 words
The magnetic disc unit as claimed in claim 1, wherein said magnetic head driving means is a linear motor.
Claim 9
Dependent Claim
34 words
The magnetic disc unit as claimed in claim 7, wherein said linear motor has a traveling element, and wherein said magnetic head supporting members are mounted on said traveling element via said temperature-compensating member.
Claim 10
Dependent Claim
23 words
The magnetic disc unit as claimed in claim 1, wherein said magnetic head driving means is a cam mechanism driven by a motor.
Claim 11
Dependent Claim
34 words
The magnetic disc unit as claimed in claim 9, wherein said cam mechanism has a cam follower, and wherein said magnetic head supporting member is mounted on said cam follower via said temperature-compensating member.
Claim 12
Dependent Claim
29 words
The magnetic disc unit as claimed in claim 1, wherein said first magnetic head supporting member and said second magnetic head supporting member are made of the same material.
Claim 13
Dependent Claim
27 words
The magnetic disc unit as claimed in claim 11, wherein said first magnetic support member and said second magnetic head supporting member are made of stainless steel.
Claim 14
Dependent Claim
28 words
The magnetic disc unit as claimed in claim 11, wherein said first magnetic head supporting member and said second magnetic head supporting member are made of phosphor bronze.
Claim 15
Dependent Claim
104 words
A head access unit comprising: head means for recording and/or reproducing of signals in a recording medium; a head carriage supporting said head means; a guide shaft for guiding said head carriage in relation to said recording medium, said guide shaft being provided on a chassis; head drive means for transferring said head carriage along said guide shaft; and a compensating plate, connected to said head means and said head carriage, said compensating plate being directly engaged with said guide shaft and said head drive means for compensating a relative misalignment between said head means and said recording medium due to variations in temperature.
Claim 16
Dependent Claim
104 words
A head access unit comprising: head means for recording and/or reproducing of signals in a recording medium; a head carriage supporting said head means; a guide shaft for guiding said head carriage in relation to said recording medium, said guide shaft being provided on a chassis; head drive means for transferring said head carriage along said guide shaft; and a compensating plate, connected to said head means and said head carriage, said compensating plate being directly engaged with said guide shaft and said head drive means for compensating a relative misalignment between said head means and said recording medium due to variations in temperature.
Claim 17
Dependent Claim
23 words
The magnetic disc unit as claimed in claim 14, wherein said head means comprises a plurality of heads acting on said recording medium.
Claim 18
Dependent Claim
22 words
A head access unit as claimed in claim 14, wherein said head drive means is a cam mechanism driven by a motor.
Claim 19
Dependent Claim
17 words
A head access unit as claimed in claim 14, wherein said head means is a magnetic head.
Claim 20
Dependent Claim
17 words
A head access unit as claimed in claim 17 wherein said recording medium is a magnetic disc.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-13 | 1993-05-15 | 1993-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-13 | 1997-05-15 | 1997-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-13 | 2001-05-15 | 2001-11-14 | $7700.00 | Window Closed / Lapsed |