US3564153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic transducer with oppositely oriented heads and two core holders
Assignee: Individual
•
Filing: 1968-10-09
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Granted: 1971-02-16
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Expires: 1988-10-09
Abstract
Abstract A magnetic transducer having two oppositely oriented, spaced stereo heads, each head having a pair of magnetic circuits capable of alternatively erasing and recording or playing back signals on a magnetic tape. Each circuit includes a pair of oppositely disposed generally U-shaped core pieces and a common center leg core piece. Erase and recording gaps are provided for each circuit between the core tips of the U-shaped core pieces and the top portion of the center leg core piece. The four recording gaps for the transducer all lie in a single plane extending transversely through both heads. The center leg core piece for one stereo head thus lie on one side of the plane while the center leg core pieces for the other stereo head lie on the other side of the plane. The transducer is split along the plane with all structure on one side thereof mounted in a first core holder and all structure on the other side thereof mounted in a second core holder. The two core holders and the structures carried by each are thus identical.
Inventors
- 👤 Leonard E Kronfeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:36
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/29
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
506 words
A magnetic transducer, comprising: a. first and second identically constructed core holders each having an open face defined by the edges of a top wall and a pair of opposite side walls having at least a pair of edge portions lying in a first plane, said top wall having first and second slots of predetermined width formed therein a predetermined distance apart; b. a plurality of generally U-shaped core pieces fixedly mounted in each of said core holders, each of said core pieces having a base leg portion terminating in an end, a side leg portion, and a top leg portion terminating in a core tip, said base and top leg portions extending toward said open face of said associated core holder; c. each of said core holders having a first pair of core pieces mounted with their top leg portions positioned with in said first slot and with their core tips terminating in a coplanar relationship in said first plane; d. first spacer means mounted between said first pair of core pieces to space said core tips a predetermined distance apart; e. each of said core holders having a second pair of core pieces mounted with their top leg portions positioned within said second slot and with their core tips and ends of their base leg portions terminating a predetermined distance below said first plane; f. each of said core holders having a pair of center leg core pieces fixedly mounted therein, each of said center leg core pieces having a top portion thereof positioned within said second slot adjacent a corresponding core tip of one of said second pair of core pieces so as to form an erase gap therebetween, and a bottom portion thereof positioned against the end of the base leg portion of the same core piece, the upper surface of at least the top and bottom portions of each of said center leg core pieces lying in said first plane; g. second spacer means mounted between said second pair of core pieces and between said pair of center leg core pieces to hold the core tips and top portions a predetermined distance apart; h. erase coil means mounted on said second part of core pieces; i. record/playback coil means mounted on said first pair of core pieces; and j. means including housing means for holding said first and second core holders in a face-to-face relationship to place the first pair of core pieces in each core holder in line with the pair of center leg core pieces and the second pair of core pieces in the other cOre holder, to thereby provide two oppositely oriented stereo heads each capable of alternatively erasing and recording or playing back signals on a multitrack magnetic tape, each of said stereo heads having a pair of recording gaps formed between the core tips of said first pair of core pieces and the upper surfaces of the top portions of said pair of center leg core pieces, said recording gaps all lying in said first plane.
Claim 2
Dependent Claim
506 words
A magnetic transducer, comprising: a. first and second identically constructed core holders each having an open face defined by the edges of a top wall and a pair of opposite side walls having at least a pair of edge portions lying in a first plane, said top wall having first and second slots of predetermined width formed therein a predetermined distance apart; b. a plurality of generally U-shaped core pieces fixedly mounted in each of said core holders, each of said core pieces having a base leg portion terminating in an end, a side leg portion, and a top leg portion terminating in a core tip, said base and top leg portions extending toward said open face of said associated core holder; c. each of said core holders having a first pair of core pieces mounted with their top leg portions positioned with in said first slot and with their core tips terminating in a coplanar relationship in said first plane; d. first spacer means mounted between said first pair of core pieces to space said core tips a predetermined distance apart; e. each of said core holders having a second pair of core pieces mounted with their top leg portions positioned within said second slot and with their core tips and ends of their base leg portions terminating a predetermined distance below said first plane; f. each of said core holders having a pair of center leg core pieces fixedly mounted therein, each of said center leg core pieces having a top portion thereof positioned within said second slot adjacent a corresponding core tip of one of said second pair of core pieces so as to form an erase gap therebetween, and a bottom portion thereof positioned against the end of the base leg portion of the same core piece, the upper surface of at least the top and bottom portions of each of said center leg core pieces lying in said first plane; g. second spacer means mounted between said second pair of core pieces and between said pair of center leg core pieces to hold the core tips and top portions a predetermined distance apart; h. erase coil means mounted on said second part of core pieces; i. record/playback coil means mounted on said first pair of core pieces; and j. means including housing means for holding said first and second core holders in a face-to-face relationship to place the first pair of core pieces in each core holder in line with the pair of center leg core pieces and the second pair of core pieces in the other cOre holder, to thereby provide two oppositely oriented stereo heads each capable of alternatively erasing and recording or playing back signals on a multitrack magnetic tape, each of said stereo heads having a pair of recording gaps formed between the core tips of said first pair of core pieces and the upper surfaces of the top portions of said pair of center leg core pieces, said recording gaps all lying in said first plane.
Claim 3
Dependent Claim
77 words
The apparatus of claim 1 wherein said first and second slots each have opposite side edges and are equal in size, said first and second spacer means having a predetermined thickness such that the pair of core pieces in each slot are forced apart by said spacer means to rest tightly against the opposite side edges of said slots to thereby aid in accurately positioning said core pieces with respect to said core holder and each other.
Claim 4
Dependent Claim
55 words
The apparatus of claim 1 wherein a single erase coil is mounted around both of said second pair of core pieces in each of said core holders, each of said erase coils providing a high frequency flux for the erase gaps and a bias flux for the recording gaps of one stereo head when energized.
Claim 5
Dependent Claim
406 words
A magnetic transducer, comprising: a. first and second core holders each having an open face; b. a plurality of generally U-shaped core pieces fixedly mounted in each of said core holders, each of said core pieces having a base leg portion, a side leg portion, and a top leg portion terminating in a core tip, said base and top leg portions extending toward said open face of said associated core holder; c. each of said core holders having a first pair of core pieces mounted therein with their core tips terminating in a first plane; d. first means to space said core tips of said first pair of core pieces a predetermined distance apart; e. each of said core holders having a second pair of core pieces mounted therein with their core tips and ends of their base leg portions terminating a predetermined distance below said first plane; f. each of said core holders having a pair of center leg core pieces fixedly mounted therein, each of said center leg core pieces having a top portion thereof positioned adjacent a corresponding core tip of one of said second pair of core pieces so as to form an erase gap therebetween, and a bottom portion thereof positioned against the end of the base leg portion of the same core piece, the upper surface of at least the top and bottom portions of each of said center leg core pieces lying in said first plane; g. second means to hold the core tips of said second pair of core pieces a predetermined distance apart; h. erase coil means mounted on said second pair of core pieces; i. record/playback coil means mounted on said first pair of core pieces; and j. means including housing means for holding said first and second core holders in a face-to-face relationship to place the first pair of core pieces in each core holder in line with the pair of center leg core pieces and the second pair of core pieces in the other core holder to thereby provide two oppositely oriented stereo heads each capable of alternatively erasing and recording or playing back signals on a multitrack magnetic tape, each of said stereo heads having a pair of recording gaps formed between the core tips of said first pair of core pieces and the top portions of said pair of center leg core pieces, said recording gaps all lying in said first plane.
Claim 6
Dependent Claim
406 words
A magnetic transducer, comprising: a. first and second core holders each having an open face; b. a plurality of generally U-shaped core pieces fixedly mounted in each of said core holders, each of said core pieces having a base leg portion, a side leg portion, and a top leg portion terminating in a core tip, said base and top leg portions extending toward said open face of said associated core holder; c. each of said core holders having a first pair of core pieces mounted therein with their core tips terminating in a first plane; d. first means to space said core tips of said first pair of core pieces a predetermined distance apart; e. each of said core holders having a second pair of core pieces mounted therein with their core tips and ends of their base leg portions terminating a predetermined distance below said first plane; f. each of said core holders having a pair of center leg core pieces fixedly mounted therein, each of said center leg core pieces having a top portion thereof positioned adjacent a corresponding core tip of one of said second pair of core pieces so as to form an erase gap therebetween, and a bottom portion thereof positioned against the end of the base leg portion of the same core piece, the upper surface of at least the top and bottom portions of each of said center leg core pieces lying in said first plane; g. second means to hold the core tips of said second pair of core pieces a predetermined distance apart; h. erase coil means mounted on said second pair of core pieces; i. record/playback coil means mounted on said first pair of core pieces; and j. means including housing means for holding said first and second core holders in a face-to-face relationship to place the first pair of core pieces in each core holder in line with the pair of center leg core pieces and the second pair of core pieces in the other core holder to thereby provide two oppositely oriented stereo heads each capable of alternatively erasing and recording or playing back signals on a multitrack magnetic tape, each of said stereo heads having a pair of recording gaps formed between the core tips of said first pair of core pieces and the top portions of said pair of center leg core pieces, said recording gaps all lying in said first plane.
Claim 7
Dependent Claim
27 words
The apparatus of claim 4 wherein a single erase coil is mounted around both of said second pair of core pieces in each of said core holders.
Claim 8
Dependent Claim
127 words
The apparatus of claim 4 wherein said first and second core holders each have a pair of sidewalls and a top wall defining said open face, wherein said top wall is provided with a pair of slots, said top leg portions of said first pair of core pieces being mounted within said first slot, said top leg portions of said second pair of core pieces being mounted within said second slot, saiD top portion of each center leg core piece being mounted within said second slot, and wherein said first and second means are spacer means to force said core pieces apart and against the opposite edges of said slots to aid in accurately aligning the core pieces with respect to the core holder and each other.
Claim 9
Dependent Claim
43 words
The apparatus of claim 6 wherein said first spacer means includes magnetically permeable shield means mounted between said first pair of core pieces in each core holder and a nonmagnetic foil member mounted between each of said core pieces and said shield means.
Claim 10
Dependent Claim
358 words
A transducer comprising: a. first and second core holders each having an open face defined by the edges of a pair of sidewalls and the edge of a top wall, at least a portion of said edges lying in a first plane; b. a pair of generally U-shaped core pieces fixedly mounted in each of said core holders, each of said core pieces having a base leg portion, a side leg portion, and a top leg portion terminating in a core tip, said base and top leg portions extending toward said open face of said associated core holder; c. each of said core holders having a first core piece mounted therein with its core tip terminating in said first plane; d. each of said core holders having a second core piece mounted therein with its core tip and the end of its base leg portion terminating a predetermined distance below said first plane; e. each of said core holders having a center leg core piece mounted therein, said center leg core piece having a top portion thereof positioned adjacent said core tip of said second core piece so as to form an erase gap therebetween, and a bottom portion thereof positioned against the end of the base leg portion of the same core piece, the upper surface of at least the top and bottom portions of said center leg core piece lying in said first plane; f. erase coil means mounted on said second core piece; g. record/playback coil means mounted on said first core piece; and h. means for holding said first and second core holders in a face-to-face relationship to place the first core piece in each core holder in line with the center leg core piece and the second core piece in the other core holder to thereby provide two oppositely oriented heads each capable of alternatively erasing and recording or playing back signals on a magnetic tape, each of said heads having a recording gap formed between the core tip of said first core piece and the top portion of said center leg core piece, said recording gaps both lying in said first plane.
Claim 11
Dependent Claim
358 words
A transducer comprising: a. first and second core holders each having an open face defined by the edges of a pair of sidewalls and the edge of a top wall, at least a portion of said edges lying in a first plane; b. a pair of generally U-shaped core pieces fixedly mounted in each of said core holders, each of said core pieces having a base leg portion, a side leg portion, and a top leg portion terminating in a core tip, said base and top leg portions extending toward said open face of said associated core holder; c. each of said core holders having a first core piece mounted therein with its core tip terminating in said first plane; d. each of said core holders having a second core piece mounted therein with its core tip and the end of its base leg portion terminating a predetermined distance below said first plane; e. each of said core holders having a center leg core piece mounted therein, said center leg core piece having a top portion thereof positioned adjacent said core tip of said second core piece so as to form an erase gap therebetween, and a bottom portion thereof positioned against the end of the base leg portion of the same core piece, the upper surface of at least the top and bottom portions of said center leg core piece lying in said first plane; f. erase coil means mounted on said second core piece; g. record/playback coil means mounted on said first core piece; and h. means for holding said first and second core holders in a face-to-face relationship to place the first core piece in each core holder in line with the center leg core piece and the second core piece in the other core holder to thereby provide two oppositely oriented heads each capable of alternatively erasing and recording or playing back signals on a magnetic tape, each of said heads having a recording gap formed between the core tip of said first core piece and the top portion of said center leg core piece, said recording gaps both lying in said first plane.
Claim 12
Dependent Claim
78 words
The apparatus of claim 8 wherein a pair of slots, open to said edge, are formed in said top wall of each core holder, said first core piece being positioned within one of said slots, said second core piece and said top portion of the center leg core piece being positioned within said other slot, and wherein means including said slots are provided to accurately position said core pieces with respect to said core holders and each other.
Claim 13
Dependent Claim
376 words
A dual-track magnetic transducer, comprising: a. first and second core holders each having an open face defined by the edges of a pair of sidewalls and a top wall, at least a portion of said edges lying in a first plane; b. a plurality of core pieces fixedly mounted in each of said core holders, each of said core pieces having a base leg portion, a side leg portion, and a top leg portion terminating in a core tip, said base and top leg portions extending toward said open face of said associated core holder; c. said first core holder having a first pair of spaced core pieces mounted therein with their core tips terminating in said first plane; d. said second core holder having a second pair of equally spaced core pieces mounted therein with their core tips and ends of their base leg portions terminating a predetermined distance below said first plane; e. said second core holder having a pair of center leg core pieces fixedly mounted therein, each of sAid center leg core pieces having a top portion thereof positioned adjacent a corresponding core tip of one of said second pair of core pieces so as to form an erase gap therebetween, and a bottom portion thereof positioned against the end of the base leg portion of the same core piece, the upper surface of at least the top and bottom portions of each of said center leg core pieces lying in said first plane; f. erase coil means mounted on said second pair of core pieces; g. record/playback coil means mounted on said first pair of core pieces; and h. means including housing means for holding said first and second core holders in a face-to-face relationship to place the first pair of core pieces in line with the pair of center leg core pieces in the other core holder to thereby provide a two channel head capable of alternatively erasing and recording or playing back signals on a multitrack magnetic tape, said head having a pair of recording gaps formed between the core tips of said first pair of core pieces and the top portions of said pair of center leg core pieces, said recording gaps both lying in said first plane.
Claim 14
Dependent Claim
376 words
A dual-track magnetic transducer, comprising: a. first and second core holders each having an open face defined by the edges of a pair of sidewalls and a top wall, at least a portion of said edges lying in a first plane; b. a plurality of core pieces fixedly mounted in each of said core holders, each of said core pieces having a base leg portion, a side leg portion, and a top leg portion terminating in a core tip, said base and top leg portions extending toward said open face of said associated core holder; c. said first core holder having a first pair of spaced core pieces mounted therein with their core tips terminating in said first plane; d. said second core holder having a second pair of equally spaced core pieces mounted therein with their core tips and ends of their base leg portions terminating a predetermined distance below said first plane; e. said second core holder having a pair of center leg core pieces fixedly mounted therein, each of sAid center leg core pieces having a top portion thereof positioned adjacent a corresponding core tip of one of said second pair of core pieces so as to form an erase gap therebetween, and a bottom portion thereof positioned against the end of the base leg portion of the same core piece, the upper surface of at least the top and bottom portions of each of said center leg core pieces lying in said first plane; f. erase coil means mounted on said second pair of core pieces; g. record/playback coil means mounted on said first pair of core pieces; and h. means including housing means for holding said first and second core holders in a face-to-face relationship to place the first pair of core pieces in line with the pair of center leg core pieces in the other core holder to thereby provide a two channel head capable of alternatively erasing and recording or playing back signals on a multitrack magnetic tape, said head having a pair of recording gaps formed between the core tips of said first pair of core pieces and the top portions of said pair of center leg core pieces, said recording gaps both lying in said first plane.
Claim 15
Dependent Claim
21 words
The apparatus of claim 10 wherein a single erase coil is mounted around both of said second pair of core pieces.
Claim 16
Dependent Claim
123 words
The apparatus of claim 10 wherein a slot of predetermined size is formed in said top wall of each core holder, said edge of said top wall lying in said first plane, said slot extending downwardly from said edge, wherein the top leg portions of said first pair of core pieces are positioned in said slot in said first core holder, wherein said top leg portions of said second pair of core pieces and said top portions of said center leg core pieces are positioned in said slot in said second core holder, and wherein spacer means are mounted between the core pieces in each slot to force them apart and against the side edges of said slot to provide accurate track spacing.
Claim 17
Dependent Claim
336 words
A magnetic transducer, comprising: a. first and second core holders each having an open face defined by the edges of a pair of sidewalls and a top wall, at least a portion of said edges lying in a first plane; b. a generally U-shaped core piece fixedly mounted in each of said core holders, said core pieces each having a base leg portion, a side leg portion, and a top leg portion terminating in a core tip, said base and top leg portions extending toward said open face of said associated core holder; c. said first core holder having said first core piece mounted therein with its core tip terminating in said first plane; d. said second core holder having said second core piece mounted therein with its core tip and the end of its base leg portion terminating a predetermined distance below said first plane; e. said second core holder having a center leg core piece fixedly mounted therein, said center leg core piece having a top portion thereof positioned adjacent the core tip of said second core piece so as to form an erase gap therebetween, and a bottom portion thereof positioned against the end of the base leg portion of said second core piece, the upper surface of at least the top and bottom portions of said center leg core piece lying in said first plane; f. erase coil means mounted on said second core piece; g. record/playback coil means mounted on said first core piece; and h. means for holding said first and second core holders in a face-to-face relationship to place the first core piece in line with the center leg core piece in the other core holder to thereby provide a head capable of alternatively erasing and recording or playing back signals on a magnetic tape, said head having a recording gap formed between the core tip of said first core piece and the top portion of said center leg core piece, said recording gap lying in said first plane.
Claim 18
Dependent Claim
336 words
A magnetic transducer, comprising: a. first and second core holders each having an open face defined by the edges of a pair of sidewalls and a top wall, at least a portion of said edges lying in a first plane; b. a generally U-shaped core piece fixedly mounted in each of said core holders, said core pieces each having a base leg portion, a side leg portion, and a top leg portion terminating in a core tip, said base and top leg portions extending toward said open face of said associated core holder; c. said first core holder having said first core piece mounted therein with its core tip terminating in said first plane; d. said second core holder having said second core piece mounted therein with its core tip and the end of its base leg portion terminating a predetermined distance below said first plane; e. said second core holder having a center leg core piece fixedly mounted therein, said center leg core piece having a top portion thereof positioned adjacent the core tip of said second core piece so as to form an erase gap therebetween, and a bottom portion thereof positioned against the end of the base leg portion of said second core piece, the upper surface of at least the top and bottom portions of said center leg core piece lying in said first plane; f. erase coil means mounted on said second core piece; g. record/playback coil means mounted on said first core piece; and h. means for holding said first and second core holders in a face-to-face relationship to place the first core piece in line with the center leg core piece in the other core holder to thereby provide a head capable of alternatively erasing and recording or playing back signals on a magnetic tape, said head having a recording gap formed between the core tip of said first core piece and the top portion of said center leg core piece, said recording gap lying in said first plane.
Claim 19
Dependent Claim
186 words
A magnetic transducer having first and second oppositely oriented, spaced heads, each of said heads comprising a magnetic circuit capable of alternatively eraSing and recording or playing back signals on a magnetic tape, each of said magnetic circuits being formed from a plurality of core pieces including two outer leg core pieces and a common center leg core piece, gap spacer means mounted between said outer leg core pieces and said common center leg core piece to form erase and record/playback gaps for each circuit, erase and record/playback coils mounted on said core pieces, said core pieces being mounted in said transducer with said center leg core pieces lying on opposite sides of a plane extending transversely through both said heads, with said record/playback gaps lying in said plane and with said erase gaps positioned on opposite sides thereof, said core pieces and coils being mounted in a pair of core holders, each of said core holders carrying all of the structure located on one side of said plane, and means for holding said pair of core holders in a face-to-face relationship to form said transducer.
Claim 20
Dependent Claim
186 words
A magnetic transducer having first and second oppositely oriented, spaced heads, each of said heads comprising a magnetic circuit capable of alternatively eraSing and recording or playing back signals on a magnetic tape, each of said magnetic circuits being formed from a plurality of core pieces including two outer leg core pieces and a common center leg core piece, gap spacer means mounted between said outer leg core pieces and said common center leg core piece to form erase and record/playback gaps for each circuit, erase and record/playback coils mounted on said core pieces, said core pieces being mounted in said transducer with said center leg core pieces lying on opposite sides of a plane extending transversely through both said heads, with said record/playback gaps lying in said plane and with said erase gaps positioned on opposite sides thereof, said core pieces and coils being mounted in a pair of core holders, each of said core holders carrying all of the structure located on one side of said plane, and means for holding said pair of core holders in a face-to-face relationship to form said transducer.
Claim 21
Dependent Claim
208 words
A magnetic transducer for alternatively erasing and recording or playing back signals on a magnetic tape, comprising: a. a housing; b. a pair of generally U-shaped core pieces fixedly mounted in said housing, said core pieces being oppositely disposed, each of said core pieces having a base leg portion, a side leg portion and a top leg portion terminating in a core tip; c. a center leg core piece mounted between said oppositely disposed core pieces with a top portion thereof extending between said core tips and a bottom portion thereof abutting the ends of said base leg portions to form erase and record/playback circuits; d. gap spacer means mounted between each core tip and said center leg core piece to form erase and record/playback gaps; e. erase coil means mounted on the U-shaped core piece forming the major portion of the erase circuit; f. recording/playback coil means mounted on said other U-shaped core piece; g. said center leg core piece having one side thereof lying in a single plane, said plane extending through said record/playback gap; and h. said housing comprising a pair of adjoining core holders, each of said core holders having securely mounted therein all of the structure located on one side of said plane.
Claim 22
Dependent Claim
208 words
A magnetic transducer for alternatively erasing and recording or playing back signals on a magnetic tape, comprising: a. a housing; b. a pair of generally U-shaped core pieces fixedly mounted in said housing, said core pieces being oppositely disposed, each of said core pieces having a base leg portion, a side leg portion and a top leg portion terminating in a core tip; c. a center leg core piece mounted between said oppositely disposed core pieces with a top portion thereof extending between said core tips and a bottom portion thereof abutting the ends of said base leg portions to form erase and record/playback circuits; d. gap spacer means mounted between each core tip and said center leg core piece to form erase and record/playback gaps; e. erase coil means mounted on the U-shaped core piece forming the major portion of the erase circuit; f. recording/playback coil means mounted on said other U-shaped core piece; g. said center leg core piece having one side thereof lying in a single plane, said plane extending through said record/playback gap; and h. said housing comprising a pair of adjoining core holders, each of said core holders having securely mounted therein all of the structure located on one side of said plane.
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |