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Patent US4295172A successfully refreshed from Google Patents.
US4295172A
Expired / Lapsed
US
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Rotary magnetic head apparatus
Assignee: Panasonic Holdings Corp
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Filing: 1979-11-08
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Granted: 1981-10-13
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Expires: 1999-11-08
Abstract
Abstract A rotary magnetic head apparatus having a bending mode vibrator or vibrators mounted on a rotary cylinder, the vibrator comprising either ring shape piezoelectric vibrators bonded together with their polarization axes aligned in the direction of the thickness or the bonded piezoelectric vibrators bisected along a diameter of the ring, the bending vibrator mounting thereon a magnetic head or heads.
Inventors
- 👤 Tetsuji Fukada
- 👤 Yukihiko Ise
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:44
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/52; G11B5/53; G11B5/531; G11B5/58; G11B5/584; G11B5/588; G11B5/592
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
72 words
A rotary support apparatus for magnetic heads which record and reproduce signals on magnetic tape, comprising two vibrators each of said vibrators supporting one of said heads, said vibrators formed respectively by bonding together two piezoelectric vibrator elements having a hemi-ring shape, the polarization axes of said elements being in parallel with the direction of the element thickness, said vibrators operating in a bending mode, and a cylindrical rotator supporting said vibrators.
Claim 2
Dependent Claim
72 words
A rotary support apparatus for magnetic heads which record and reproduce signals on magnetic tape, comprising two vibrators each of said vibrators supporting one of said heads, said vibrators formed respectively by bonding together two piezoelectric vibrator elements having a hemi-ring shape, the polarization axes of said elements being in parallel with the direction of the element thickness, said vibrators operating in a bending mode, and a cylindrical rotator supporting said vibrators.
Claim 3
Dependent Claim
24 words
A rotary support apparatus having magnetic heads as defined in claim 1, wherein said bonded two piezoelectric vibrators are cut symmetrically from one ring.
Claim 4
Dependent Claim
26 words
A rotary support apparatus having magnetic heads as defined in claim 1, wherein said bonded two piezoelectric vibrators consist of two hemi-rings having different inner diameters.
Claim 5
Dependent Claim
44 words
A rotary apparatus having magnetic heads as defined in claim 1, wherein said two vibrators operating in a bending mode are mounted on said cylindrical rotator so that said two vibrators have a bending mode opposite to each other in the direction of polarization.
Claim 6
Dependent Claim
27 words
A rotary apparatus having magnetic heads as defined in claims 1, 2, 3 or 4, wherein two magnetic heads for recording are mounted on said cylindrical rotator.
Claim 7
Dependent Claim
38 words
A rotary apparatus having magnetic heads as defined in claim 1, wherein said two vibrators combine to form a vibrator consisting of two piezoelectric elements in a ring shape with electrodes which are separated at the bonding portion.
Claim 8
Dependent Claim
36 words
A rotary apparatus having magnetic heads as defined in claim 6, wherein said vibrators are formed by bonding together two piezoelectric elements in a ring shape, each of them having bisected regions of mutually anti-parallel polarization.
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) | 1984-10-12 | 1985-04-13 | 1985-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-12 | 1989-04-13 | 1989-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-12 | 1993-04-13 | 1993-10-13 | $7700.00 | Window Closed / Lapsed |