USRE28509E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compensating base for lead-frame bonding
Assignee: —
•
Filing: 1974-01-28
•
Granted: 1975-08-12
•
Expires: 1994-01-28
Abstract
Abstract Bonding of lead frames to ceramic substrates is performed on a bonder with a compensating base. The compensating base includes a series of cantilever spring elements attached to a rigid support. The elements are reduced in cross-sectional area near the point of attachment to the rigid support. A free end of each of the spring elements is placed under each point of the substrate to which a lead is to be bonded. The elements accommodate to variations in thickness and waviness of the substrate so that it does not crack during the bonding operation.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:23
CPC Classifications
H; H10; H10P; H10P72/00; H10P72/04; H10P72/0446; B; B23; B23K; B23K20/00; B23K20/02; B23K20/023; B23K20/025; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49121
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
119 words
A method of bonding a plurality of leads to a brittle planar article which comprises the steps of: supporting the article with a plurality of cantilever spring elements extending from a base with a space between the elements and the base, each element being located below a point where a lead is desired and each element being movable independently of the others; and compressively engaging all of the desired leads simultaneously against said brittle supported article to bond said leads to said article, whereby the spring elements are deflected independently of one another into the space between the elements and the base to reduce stresses introduced to said article during said compressive engagement thus preventing cracking of the article.
Claim 2
Independent Claim
119 words
A method of bonding a plurality of leads to a brittle planar article which comprises the steps of: supporting the article with a plurality of cantilever spring elements extending from a base with a space between the elements and the base, each element being located below a point where a lead is desired and each element being movable independently of the others; and compressively engaging all of the desired leads simultaneously against said brittle supported article to bond said leads to said article, whereby the spring elements are deflected independently of one another into the space between the elements and the base to reduce stresses introduced to said article during said compressive engagement thus preventing cracking of the article.
Claim 3
Independent Claim
116 words
A method of bonding a plurality of leads to a brittle planar article whiCh comprises the steps of: supporting the article with a plurality of cantilever spring elements extending and spaced from, and integral with, a common base, each element being located below a point where a lead is desired and each element being movable independently of the others; compressively engaging all of the desired leads simultaneously against said brittle supported articles to bond said leads to said article; and compensating for irregularity of shape of the brittle article by deflecting the spring elements into the space between the elements and the base, during said compressive engagement to reduce stresses and prevent cracking of the article.
Claim 4
Independent Claim
116 words
A method of bonding a plurality of leads to a brittle planar article whiCh comprises the steps of: supporting the article with a plurality of cantilever spring elements extending and spaced from, and integral with, a common base, each element being located below a point where a lead is desired and each element being movable independently of the others; compressively engaging all of the desired leads simultaneously against said brittle supported articles to bond said leads to said article; and compensating for irregularity of shape of the brittle article by deflecting the spring elements into the space between the elements and the base, during said compressive engagement to reduce stresses and prevent cracking of the article.
Claim 5
Independent Claim
172 words
A method of bonding a plurality of leads to a brittle planar article which comprises the steps of: supporting the article on a plurality of pins slidably extending through a platform, each pin having a free end located below a point where a lead is to be bonded and each pin having a head opposite its free end to prevent it from passing completely through the platform, each head being supported by a cantilever spring element so that each pin is movable through the platform independently of the others, each spring element extending from a base with a space between each element and the base; compressively engaging all the leads to be bonded simultaneously against said supported article to bond said leads to said article; and compensating for irregularity of shape of the brittle article by slidably moving the pins through the platform and deflecting the spring elements thereunder into the space between the elements and the base during said compressive engagement to reduce stress and to prevent cracking of the article.
Claim 6
Independent Claim
172 words
A method of bonding a plurality of leads to a brittle planar article which comprises the steps of: supporting the article on a plurality of pins slidably extending through a platform, each pin having a free end located below a point where a lead is to be bonded and each pin having a head opposite its free end to prevent it from passing completely through the platform, each head being supported by a cantilever spring element so that each pin is movable through the platform independently of the others, each spring element extending from a base with a space between each element and the base; compressively engaging all the leads to be bonded simultaneously against said supported article to bond said leads to said article; and compensating for irregularity of shape of the brittle article by slidably moving the pins through the platform and deflecting the spring elements thereunder into the space between the elements and the base during said compressive engagement to reduce stress and to prevent cracking of the article.
Claim 7
Dependent Claim
36 words
The method of claim 3, wherein the spring elements are provided with an initial deflection by their heads being positioned between the platform and such elements so that the pins assume an initial predetermined neutral position.
References Cited (Backward Citations)
US2727650A
Cited
US3132239A
Cited
US3483067A
Cited
US3541673A
Cited
US3608809A
Cited
US3669806A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |