US3712575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cavity mold with selectively positioned resilient wall portions
Assignee: International Business Machines Corp
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Filing: 1970-11-06
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Granted: 1973-01-23
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Expires: 1990-11-06
Abstract
Abstract A magnetic recording head is molded by positioning a number of ceramic cards, each of which carries electronic components and head gaps, in a metallic cavity mold. The mold includes selectively placed rubber inserts. These inserts are located such that an insert engages the ceramic cards at the area of the head gap, and such that inserts engage the cards in the vicinity of the electronic components to effectively place these components outside the mold cavity. The subsequent injection of a plastic molding compound into the mold cavity selectively encapsulates the cards, leaving the head gap area and the electronic components free of molding compound.
Inventors
- 👤 R Bement
- 👤 A Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:05
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/14; B29C45/14065; B29C45/14778; B29C45/17; B29C45/26; B29C45/37; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49036; Y10T29/49041; Y10T29/49055; Y10T29/49059
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
211 words
A cavity mold for use in encapsulating a fragile magnetic head member in a thermo-setting material, the head member having an edge which supports a magnetic cap, electronic components spaced from the gap and circuit means connecting the gap to the electronic components, the mold comprising; a rigid mold partially defining a cavity adapted to hold the head member at a given position within the cavity, a first resilient member mounted in a first wall portion of said mold to engage the magnetic gap of the head member, a second resilient member mounted in an opposite second wall portion of said mold to engage an opposite portion of the head member, said first and second resilient members engaging the head member to resiliently hold the same in the given position within the mold, said resilient holding accommodating dimensional variation in the head member and allowing movement thereof during molding, and a third resilient member mounted in a third wall portion of said mold to engage the head member adjacent the electronic components and to form a cavity which covers the electronic components and isolates the same from the mold cavity, said third resilient member deforming sufficiently to allow the circuit means to extend through the mold cavity to the magnetic gap.
Claim 2
Dependent Claim
211 words
A cavity mold for use in encapsulating a fragile magnetic head member in a thermo-setting material, the head member having an edge which supports a magnetic cap, electronic components spaced from the gap and circuit means connecting the gap to the electronic components, the mold comprising; a rigid mold partially defining a cavity adapted to hold the head member at a given position within the cavity, a first resilient member mounted in a first wall portion of said mold to engage the magnetic gap of the head member, a second resilient member mounted in an opposite second wall portion of said mold to engage an opposite portion of the head member, said first and second resilient members engaging the head member to resiliently hold the same in the given position within the mold, said resilient holding accommodating dimensional variation in the head member and allowing movement thereof during molding, and a third resilient member mounted in a third wall portion of said mold to engage the head member adjacent the electronic components and to form a cavity which covers the electronic components and isolates the same from the mold cavity, said third resilient member deforming sufficiently to allow the circuit means to extend through the mold cavity to the magnetic gap.
Claim 3
Dependent Claim
160 words
Apparatus for use in molding a read/write magnetic head, comprising; a pair of fragile cards individually carrying magnetic transducing gaps on like edges thereof, electronic components on a side surface thereof, and circuit conductors interconnecting each card''s gaps and electronic components, a mold adapted to receive said cards, first resilient insert means positioned at a selected surface of said mold, a second resilient insert positioned at a diametrically opposed surface of said mold, said first and second resilient inserts being constructed and arranged to hold said cards in parallel spaced relationship during molding, said first insert means covering said gaps to prevent the deposit of a molding compound thereon, and third and fourth resilient inserts positioned at selected surfaces of said mold to form protective pockets which cover said electronic components and prevent the deposit of molding compound thereon, said third and fourth inserts deforming to allow the passage of said circuit conductors through the mold cavity to said gaps.
Claim 4
Dependent Claim
160 words
Apparatus for use in molding a read/write magnetic head, comprising; a pair of fragile cards individually carrying magnetic transducing gaps on like edges thereof, electronic components on a side surface thereof, and circuit conductors interconnecting each card''s gaps and electronic components, a mold adapted to receive said cards, first resilient insert means positioned at a selected surface of said mold, a second resilient insert positioned at a diametrically opposed surface of said mold, said first and second resilient inserts being constructed and arranged to hold said cards in parallel spaced relationship during molding, said first insert means covering said gaps to prevent the deposit of a molding compound thereon, and third and fourth resilient inserts positioned at selected surfaces of said mold to form protective pockets which cover said electronic components and prevent the deposit of molding compound thereon, said third and fourth inserts deforming to allow the passage of said circuit conductors through the mold cavity to said gaps.
Claim 5
Dependent Claim
81 words
Apparatus as defined in claim 2 wherein said mold is metallic and wherein said plurality of inserts are formed of a rubber-like material which is bonded to the metal mold to complete the definition of the mold cavity, to form a mold cavity whose wall surfaces include both metal and rubber-like material, and wherein said fragile cards are ceramic cards which are held in parallel spaced position, the cards engaging the mold cavity wall only at a surface of rubber-like material.
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) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |