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US5530283A Expired / Lapsed US ⏱️ 0.0 years remaining

Lead frame and lead frame material

Assignee: Fujikin Inc
•
Filing: 1995-08-23
•
Granted: 1996-06-25
•
Expires: 2015-08-23
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Abstract

Abstract An object of the present invention is to provide a lead frame and a material for lead frame which insure excellent bonding and enables substantial reduction of time for production because such processes as plating are not required and furthermore are excellent in abration resistance. The present invention is characterized in that a silver layer having a construction where amplitude of a refracted ray refracted on the (200) surface is 1/3 or more of the amplitude of refracted X ray refracted on the (111) surface comprises an outer lead section of the base material for the lead frame. The base material is preferably copper, copper-alloy, iron, or iron alloy. The silver layer is formed, for instance, by means of silver plating, and the thickness is preferably in a range from 8 m to 30 m. An intermediate layer may be provided between a surface of the base material and the silver layer.

Inventors

  • 👤 Tadahiro Ohmi
  • 👤 Nobukazu Ikeda
  • 👤 Michio Yamaji
  • 👤 Tsutomu Shinohara
  • 👤 Akihiro Morimoto
  • 👤 Yasuyuki Shirai

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 12:27
CPC Classifications
H; H10; H10W; H10W70/00; H10W70/40; H10W70/456; H10W70/457; H10W72/00; H10W72/50; H10W72/551; H10W72/552; H10W72/5522; H10W72/5524; H10W74/00

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 56 words
A lead frame, wherein a silver layer having a crystal structure, in which intensity of a diffraction ray diffracted on a (200) surface is 1/3 or more of that of a diffraction X ray diffracted on a (111) surface, is formed at least in an outer lead section of a base material of the lead frame.
Claim 2
Dependent Claim 56 words
A lead frame, wherein a silver layer having a crystal structure, in which intensity of a diffraction ray diffracted on a (200) surface is 1/3 or more of that of a diffraction X ray diffracted on a (111) surface, is formed at least in an outer lead section of a base material of the lead frame.
Claim 3
Dependent Claim 29 words
A lead frame according to claim 1, wherein a base material of said lead frame is made from copper or copper alloy as well from iron or iron alloy.
Claim 4
Dependent Claim 15 words
A lead frame according to claim 1, wherein said silver layer is formed by plating.
Claim 5
Dependent Claim 25 words
A lead frame according to claim 1, wherein a thickness of said silver surface layer is in a range from 8 μm to 30 μm.
Claim 6
Dependent Claim 28 words
A lead frame according to claim 1, wherein an intermediate layer is provided between a surface of a base material for said lead frame and said silver layer.
Claim 7
Dependent Claim 39 words
A lead frame material, wherein a silver frame having a crystal structure, in which intensity of a diffraction ray diffracted on a (200) surface is 1/3 or more of that of a diffraction ray diffracted on a (111) surface.
Claim 8
Dependent Claim 39 words
A lead frame material, wherein a silver frame having a crystal structure, in which intensity of a diffraction ray diffracted on a (200) surface is 1/3 or more of that of a diffraction ray diffracted on a (111) surface.

References Cited (Backward Citations)

US4883774A Cited
US4903401A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1999-06-25 1999-12-25 2000-06-25 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2003-06-25 2003-12-25 2004-06-25 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2007-06-25 2007-12-25 2008-06-25 $7700.00 Window Closed / Lapsed

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