US4044392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making a read-while-write tape head and the product made thereby
Assignee: International Business Machines Corp
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Filing: 1975-08-14
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Granted: 1977-08-23
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Expires: 1995-08-14
Abstract
Abstract Write windings are deposited on a ferrite half yoke mounted on a titanium body, and magnetoresistive elements are deposited on another ferrite half yoke mounted on another titanium body. A center section comprising a sandwich of silver-copper shielding material between two ferrite sheets has glass-filled slots cut on one side thereof. The center shield is placed between the write and read sides with the write windings placed between pairs of glass-filled slots and with the magnetoresistive elements in contact with the opposite surface of the center shield. The write windings and the magnetoresistive elements are connected to connector blocks prior to final assembly, and the write and read sides and the center section are pressured together by bolts through two end pieces, forming a vise-like structure.
Inventors
- 👤 George W. Brock
- 👤 Frank B. Shelledy
- 👤 Arthur B. Wills
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:27
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/133; G11B5/265; G11B5/2651; G11B5/29; G11B5/33; G11B5/39; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49055; Y10T29/4906; Y10T29/49064
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
185 words
A method for manufacturing a multitrack read-while magnetic head comprising the steps of: bonding substrates of ferrite on two titanium bodies; depositing on one ferrite substrate a single copper write winding for each track; depositiong on the other ferrite substrate a single magnetoresistive read element for each track; connecting each of the write windings and read elements to a separate write connector block and a read connector block via a pair of wires; brazing a silver-copper sheet between a pair of ferrite layers, one of which contains glass-filled slots, thereby forming a center section which resists feedthrough, and forming a yoke which provides a magnetic closure; assembling the sheet between the two substrates such that the ferrite layers of the center suction cooperate with respective ones of the ferrite substrates to form a magnetic head. applying low viscosity epoxy from the outside of the bodies; squeezing the bodies together between two titanium end pieces fastened by titanium bolts; and forming a surface contour on the head by grinding and lapping the ferrite substrates and center section while simultaneously monitoring the resistance of the read elements.
Claim 2
Independent Claim
185 words
A method for manufacturing a multitrack read-while magnetic head comprising the steps of: bonding substrates of ferrite on two titanium bodies; depositing on one ferrite substrate a single copper write winding for each track; depositiong on the other ferrite substrate a single magnetoresistive read element for each track; connecting each of the write windings and read elements to a separate write connector block and a read connector block via a pair of wires; brazing a silver-copper sheet between a pair of ferrite layers, one of which contains glass-filled slots, thereby forming a center section which resists feedthrough, and forming a yoke which provides a magnetic closure; assembling the sheet between the two substrates such that the ferrite layers of the center suction cooperate with respective ones of the ferrite substrates to form a magnetic head. applying low viscosity epoxy from the outside of the bodies; squeezing the bodies together between two titanium end pieces fastened by titanium bolts; and forming a surface contour on the head by grinding and lapping the ferrite substrates and center section while simultaneously monitoring the resistance of the read elements.
Claim 3
Dependent Claim
20 words
The method of claim 1 wherein the forming operation includes removing at least one transverse scallop from the center section.
Claim 4
Independent Claim
167 words
A method for manufacturing from two bodies a multitrack read-while-write magnetic head comprising the steps of: bonding a substrate of magnetically permeable material on each of said two bodies; depositing on one substrate a single conductive write winding for each track; depositing on the other substrate a single read element, having an electrical resistance, for each track; connecting the write windings and read elements to outputs; braxing a highly conductive sheet between a pair of magnetically permeable layers, thereby forming a center section which resists feedthrough and a yoke which provides a magnetic closure; assembling the center section between the two substrates such that the magnetically permeable layers of the center section cooperate with respective ones of the magnetically permeable substrates to form a magnetic head. applying a sealant to the outside surfaces of the assembly; squeezing the assembly together between end pieces; and forming a surface contour on the head by abrading the substrates and center section while simultaneously monitoring the resistances of the read elements.
Claim 5
Independent Claim
167 words
A method for manufacturing from two bodies a multitrack read-while-write magnetic head comprising the steps of: bonding a substrate of magnetically permeable material on each of said two bodies; depositing on one substrate a single conductive write winding for each track; depositing on the other substrate a single read element, having an electrical resistance, for each track; connecting the write windings and read elements to outputs; braxing a highly conductive sheet between a pair of magnetically permeable layers, thereby forming a center section which resists feedthrough and a yoke which provides a magnetic closure; assembling the center section between the two substrates such that the magnetically permeable layers of the center section cooperate with respective ones of the magnetically permeable substrates to form a magnetic head. applying a sealant to the outside surfaces of the assembly; squeezing the assembly together between end pieces; and forming a surface contour on the head by abrading the substrates and center section while simultaneously monitoring the resistances of the read elements.
Claim 6
Dependent Claim
124 words
The process of forming a device for transducing electrical signals and magnetic fields, including the steps of: depositing a field generating write winding on a first composite titanium-ferrite substrate; depositing a field sensitive read element, having an electrical resistance, on a second composite titanium-ferrite substrate; providing connections between the write winding and read element and external electrical circuits; assembling a highly conductive feedthrough-eliminating sheet between two magnetically permeable layers, one of which includes glass-filled slots; assembling the feedthrough-eliminating assembly between the first and second substrates such that the magnetically permeable layers of the feedthrough-eliminating assembly cooperate with respective ones of the titanium-ferrite substrates to form a transducing device; and abrading the surface of the assembled structure while monitoring the resistance of the read element.
Claim 7
Dependent Claim
124 words
The process of forming a device for transducing electrical signals and magnetic fields, including the steps of: depositing a field generating write winding on a first composite titanium-ferrite substrate; depositing a field sensitive read element, having an electrical resistance, on a second composite titanium-ferrite substrate; providing connections between the write winding and read element and external electrical circuits; assembling a highly conductive feedthrough-eliminating sheet between two magnetically permeable layers, one of which includes glass-filled slots; assembling the feedthrough-eliminating assembly between the first and second substrates such that the magnetically permeable layers of the feedthrough-eliminating assembly cooperate with respective ones of the titanium-ferrite substrates to form a transducing device; and abrading the surface of the assembled structure while monitoring the resistance of the read element.
Claim 8
Dependent Claim
152 words
The product made by the process of: depositing a magnetic field writing winding on a first composite titanium-ferrite substrate; connecting the winding to an external source of electrical signals; depositing a magnetic field reading element, having an electrical resistance, on a second composite titanium-ferrite substrate; connecting the element to an external electrical signal utilization circuit; assembling a highly conductive feedthrough-eliminating sheet between two magnetically permeable layers; forming grooves in a selected one of the two permeable layers; filling the grooves with glass; enclosing the feedthrough-eliminating assembly between the first and second substrates such that the magnetically permeable layers of the feedthrough-eliminating assembly cooperate with respective ones of the titanium-ferrite substrates to form a magnetic head; squeezing the structure together between two titanium vise blocks with titanium bolts; abrading the surface of the assembled structure; monitoring the resistance of the read element; and terminating surface abrasion when the resistance equals a predetermined quantity.
Claim 9
Dependent Claim
152 words
The product made by the process of: depositing a magnetic field writing winding on a first composite titanium-ferrite substrate; connecting the winding to an external source of electrical signals; depositing a magnetic field reading element, having an electrical resistance, on a second composite titanium-ferrite substrate; connecting the element to an external electrical signal utilization circuit; assembling a highly conductive feedthrough-eliminating sheet between two magnetically permeable layers; forming grooves in a selected one of the two permeable layers; filling the grooves with glass; enclosing the feedthrough-eliminating assembly between the first and second substrates such that the magnetically permeable layers of the feedthrough-eliminating assembly cooperate with respective ones of the titanium-ferrite substrates to form a magnetic head; squeezing the structure together between two titanium vise blocks with titanium bolts; abrading the surface of the assembled structure; monitoring the resistance of the read element; and terminating surface abrasion when the resistance equals a predetermined quantity.
Claim 10
Dependent Claim
112 words
The product made by the process of: bonding a first ferrite substrate on a first titanium body; bonding a second ferrite substrate on a second titanium body; depositing on the first substrate a single copper write winding for each track; depositing on the second substrate a single magnetoresistive read element for each track; connecting each of the write windings and read elements to a pair of wires; brazing a silver-copper sheet between a pair of ferrite layers, one of which layers has glass-filled slots, thereby forming a center section and such that the ferrite layers of the center section cooperate with respective ones of the ferrite substrates to form a magnetic head
Claim 11
Dependent Claim
112 words
The product made by the process of: bonding a first ferrite substrate on a first titanium body; bonding a second ferrite substrate on a second titanium body; depositing on the first substrate a single copper write winding for each track; depositing on the second substrate a single magnetoresistive read element for each track; connecting each of the write windings and read elements to a pair of wires; brazing a silver-copper sheet between a pair of ferrite layers, one of which layers has glass-filled slots, thereby forming a center section and such that the ferrite layers of the center section cooperate with respective ones of the ferrite substrates to form a magnetic head
Claim 12
Dependent Claim
44 words
The product of claim 6 wherein the process includes the further steps of: forming a surface contour on the head by abrading the assembly while simultaneously monitoring the resistance of the read elements; and removing at least one transverse scallop from the center section.
References Cited (Backward Citations)
US3064333A
Cited
US3842494A
Cited
US3854199A
Cited
US3737992A
Cited
US3821815A
Cited
US3829896A
Cited
US3881190A
Cited
US3908194A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-22 | 1981-02-21 | 1981-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-22 | 1985-02-21 | 1985-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-22 | 1989-02-21 | 1989-08-23 | $7700.00 | Window Closed / Lapsed |