Anisotropically conductive sheet, production process thereof and connector

• US 6,841,876 B2
• Filed: 06/23/2003
• Issued: 01/11/2005
• Est. Priority Date: 09/17/1999
• Status: Expired due to Term

• Current Assignee: ISC Incorporated (Svenska Cellulosa AB)
• Original Assignee: JSR Corporation
• Inventors: Yasuda, Naoshi, Haruta, Yuichi
• Primary Examiner(s): POTTER, ROY KARL
• Application Number:
  US10/600,657
• Publication Number:
  US 20040080048A1
• Time in Patent Office: 568 Days
• Field of Search: 257/741, 257/778, 361/212, 361/220
• US Class Current: 257/741
• CPC Class Codes: H01L 2224/16 of an individual bump connector
• CPC Class Codes: H01L 2924/15174 in different layers of the multilayer substrate
• CPC Class Codes: H01R 12/52 connecting to other rigid printed circuits or like structures
• CPC Class Codes: H01R 13/2414 conductive elastomers
• CPC Class Codes: H01R 43/007 for elastomeric connecting elements

Abstract

Disclosed herein is an anisotropically conductive sheet that exhibits conductivity in its thickness-wise direction, and is suitably used as a connector.

The anisotropically conductive sheet of the first feature may comprise a plurality of columner conductive parts extending in the thickness-wise direction and a semiconductive part that exhibits semiconductivity in its plane direction. In the sheet, respective conductive parts may be surrounded by the semiconductive part with an insulating part therebetween. The sheet may comprise conductive particles contained in a sheet member exhibiting semiconductivity in a state oriented so as to be arranged in the thickness-wise direction thereof.

The sheet of the second feature has a static charge-eliminating layer integrally provided on the surface of a sheet member.

The sheet of the third feature has a conductive part for static-charge elimination to be connected to a ground.

The sheet can inhibit static electricity from being accumulated on the surface thereof.

Claims

1. An anisotropically conductive sheet that exhibits conductivity in its thickness-wise direction, which comprises a semiconductive part that exhibits semiconductivity in the plane direction of the sheet.

2. The anisotropically conductive sheet according to claim 1, wherein the volume resistivity of the semiconductive part is 10⁻

7 to 10⁴ Ω

m.

3. The anisotropically conductive sheet according to claim 1, wherein the surface resistivity of the semiconductive part is 10⁻

1 to 10¹⁰ Ω

/□

.

7. The anisotropically conductive sheet according to claim 1, wherein the semiconductive parts or base sheet contains at least one conductive substance selected from among conductive organic substances, amine type organic conductive substances, conductive polymers, metallic particles and carbon black.

8. The anisotropically conductive sheet according to claim 1, wherein the semiconductive parts or base sheet contains a sodium salt of an alkylsulfonic acid as a conductive substance.

12. A connector formed of the anisotropically conductive sheet according claim 1.

13. A method for inspecting a circuit device, which comprises conducting electrical inspection of the circuit device using the connector according to claim 12.

4. An anisotropically conductive sheet comprising a plurality of conductive parts each extending in the thickness-wise direction of the sheet and semiconductive parts each exhibiting semiconductivity in the plane direction of the sheet and formed so as to surround each of the conductive parts.

9. A process for producing the anisotropically conductive sheet according to claim 4, which comprises the steps of forming a sheet-forming material layer with conductive particles which exhibit magnetism, and a semiconductivity-imparting substance contained in a polymer-forming material which will become an elastic polymeric substance by curing, applying a parallel magnetic field having an intensity distribution to the sheet-forming material layer in the thickness-wise direction thereof and subjecting the sheet-forming material layer to a curing treatment.

10. A process for producing the anisotropically conductive sheet according to claim 4, which comprises the steps of providing a sheet for semiconductive part exhibiting semiconductivity, in which through-holes or openings have been formed, forming a layer of a material for conductive part containing conductive particles, which exhibit magnetism, in a polymer-forming material which will become an elastic polymeric substance by curing, in each of the through-holes or openings in the sheet for semiconductive part, applying a parallel magnetic field or a parallel magnetic field having an intensity distribution to the layer of the material for conductive part in the thickness-wise direction thereof and subjecting the layer of the material for conductive part to a curing treatment.

5. An anisotropically conductive sheet comprising a plurality of conductive parts each extending in the thickness-wise direction of the sheet, insulating parts formed so as to surround each of the conductive parts, and semiconductive parts each exhibiting semiconductivity in the plane direction of the sheet and formed so as to surround each of the insulating parts.

6. An anisotropically conductive sheet comprising a base sheet exhibiting semiconductivity in its plane direction and conductive particles contained in the base sheet in a state oriented so as to be arranged in the thickness-wise direction of the base sheet.

11. A process for producing the anisotropically conductive sheet according claim 6, which comprises the steps of forming a sheet-forming material layer with conductive particles which exhibit magnetism, and a semiconductivity-imparting substance contained in a polymer-forming material which will become an elastic polymeric substance by curing, applying a parallel magnetic field to the sheet-forming material layer in the thickness-wise direction thereof and subjecting the sheet-forming material layer to a curing treatment.