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US4414596A Expired / Lapsed US ⏱️ 0.0 years remaining

Magnetic head assembly

Assignee: Nakamichi Corp
•
Filing: 1981-06-17
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Granted: 1983-11-08
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Expires: 2001-06-17
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Abstract

Abstract A magnetic head suitable for a reversible stereo cassette tape recorder is disclosed. The magnetic head had a larger operating gap for the recording head than for the reproducing head. This is accomplished by a thicker spacer between the core pieces for the recording head than for the reproducing head. The two spacers are in line, and the core pieces are held on one hand by a common holding member and on the other hand by separate lower and upper holding members.

Inventors

  • 👤 Niro Nakamichi

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 21:32
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/187; G11B5/23; G11B5/48; G11B5/488; G11B5/4893

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 172 words
A magnetic head for reversibly recording and reproducing having a plurality of operating gaps substantially in line which are formed between a plurality of pairs of left-hand and right-hand core pieces facing each other with shielding between adjacent pairs, said left-hand and right-hand core pieces including first and second core piece groups, characterized by the combination of: a common holding member to hold one-hand core pieces together; first and second divided holding members to hold first and second core piece groups of other-hand core pieces, respectively; first spacer means interposed between said first core piece group of said other-hand core pieces and the corresponding core piece group of said one-hand core pieces; and second spacer means interposed between said second core piece group of said other-hand core pieces and the corresponding core piece group of said one-hand core pieces; said first and second spacer means establishing recording and reproducing gap groups, respectively, with said recording gap group having a gap width greater than said reproducing gap width and substantially in line therewith.
Claim 2
Dependent Claim 172 words
A magnetic head for reversibly recording and reproducing having a plurality of operating gaps substantially in line which are formed between a plurality of pairs of left-hand and right-hand core pieces facing each other with shielding between adjacent pairs, said left-hand and right-hand core pieces including first and second core piece groups, characterized by the combination of: a common holding member to hold one-hand core pieces together; first and second divided holding members to hold first and second core piece groups of other-hand core pieces, respectively; first spacer means interposed between said first core piece group of said other-hand core pieces and the corresponding core piece group of said one-hand core pieces; and second spacer means interposed between said second core piece group of said other-hand core pieces and the corresponding core piece group of said one-hand core pieces; said first and second spacer means establishing recording and reproducing gap groups, respectively, with said recording gap group having a gap width greater than said reproducing gap width and substantially in line therewith.
Claim 3
Dependent Claim 36 words
A magnetic head as set forth in claim 1, wherein said shielding includes a shielding plate disposed between one pair of left and right-hand core pieces and an adjacent pair of left and right-hand core pieces.
Claim 4
Dependent Claim 38 words
A magnetic head as set forth in claim 1, and usable in a reversible cassette tape recorder in which two of said magnetic heads are provided in a reversed and symmetrical manner for forward and reverse stereo playing.

References Cited (Backward Citations)

DE1028793B Cited
GB1008728A Cited
US3806902A Cited
US4107751A Cited
SU544993A1 Cited
SU595773A1 Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1986-11-07 1987-05-09 1987-11-08 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1990-11-07 1991-05-09 1991-11-08 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1994-11-07 1995-05-09 1995-11-08 $7700.00 Window Closed / Lapsed

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