Source: http://www.google.com/patents/US7362087?ie=ISO-8859-1&dq=5,867,764
Timestamp: 2014-08-20 22:56:35
Document Index: 665661838

Matched Legal Cases: ['Art. 3', 'Art. 4', 'Art. 5', 'Art. 6', 'Art. 1', 'Art. 2', 'Art. 3', 'Art. 4', 'Art. 5', 'Art. 6', 'Art. 7', 'Art. 8', 'Art. 9', 'art\n16', 'art 16', 'arts 16', 'art 16', 'art 16', 'arts 16']

Patent US7362087 - Adapter for circuit board examination and device for circuit board examination - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsAn adaptor for inspection of circuit boards includes a wiring board for connection, on a front surface of which a plurality of connecting electrodes are formed correspondingly to electrodes to be inspected, and an anisotropically conductive elastomer sheet detachably arranged on the front surface of...http://www.google.com/patents/US7362087?utm_source=gb-gplus-sharePatent US7362087 - Adapter for circuit board examination and device for circuit board examinationAdvanced Patent SearchPublication numberUS7362087 B2Publication typeGrantApplication numberUS 10/588,760Publication dateApr 22, 2008Filing dateFeb 17, 2005Priority dateFeb 24, 2004Fee statusPaidAlso published asCN1922493A, CN100451658C, EP1720019A1, US20070159200, WO2005080996A1Publication number10588760, 588760, US 7362087 B2, US 7362087B2, US-B2-7362087, US7362087 B2, US7362087B2InventorsKiyoshi Kimura, Sugiro ShimodaOriginal AssigneeJsr CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (9), Referenced by (4), Classifications (17), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetAdapter for circuit board examination and device for circuit board examinationUS 7362087 B2Abstract An adaptor for inspection of circuit boards includes a wiring board for connection, on a front surface of which a plurality of connecting electrodes are formed correspondingly to electrodes to be inspected, and an anisotropically conductive elastomer sheet detachably arranged on the front surface of the wiring board for connection. The anisotropically conductive elastomer sheet has a surface roughness of 0.5 to 5 μm on its front surface coming into contact with the circuit board, and a surface roughness of at most 0.3 μm on its back surface coming into contact with the wiring board for connection. The wiring board for connection has, on its front surface, an insulating layer formed such that each of the connecting electrodes is exposed, and the insulating layer has a surface roughness of at most 0.2 μm on its front surface.
12. An inspection apparatus for circuit boards, comprising the adaptor according to claim 1 for inspection of circuit boards. Description
TECHNICAL FIELD The present invention relates to an adaptor for inspection of circuit boards, which is used in electrical inspection of circuit boards, for example, printed circuit boards and the like, and an inspection apparatus for circuit boards, which is equipped with this adaptor for inspection of circuit boards.
BACKGROUND ART With respect to a circuit board for making up or mounting electronic parts, such as packaged LSIs such as BGA and CSP, MCM, and other integrated circuit devices, it is necessary to inspect the electrical properties of the circuit board before the electronic parts or the like are assembled or mounted for the purpose of confirming that a wiring pattern of the circuit board has the expected performance.
On the other hand, the anisotropically conductive elastomer sheet is a sheet exhibiting conductivity only in its thickness-wise direction or exhibiting conductivity only in the thickness-wise direction when it is pressurized, and those of various structures have heretofore been known. For example, Patent Art. 3 discloses an anisotropically conductive elastomer sheet (hereinafter also referred to as �dispersion type anisotropically conductive elastomer sheet�) obtained by uniformly dispersing metal particles in an elastomer, and Patent Art. 4 discloses an anisotropically conductive elastomer sheet (hereinafter also referred to as �uneven distribution type anisotropically conductive elastomer sheet�) obtained by unevenly distributing particles of a conductive magnetic substance in an elastomer to form a great number of conductive path-forming parts each extending in a thickness-wise direction thereof and an insulating part mutually insulating them. Further, Patent Art. 5 discloses an uneven distribution type anisotropically conductive elastomer sheet with a difference in level defined between the surface of each conductive path-forming part and an insulating part.
(1) The uneven distribution type anisotropically conductive elastomer sheet needs to be produced by using a special and expensive mold, whereas the dispersion type anisotropically conductive elastomer sheet can be produced at low cost without using such a mold. (2) The uneven distribution type anisotropically conductive elastomer sheet needs to form conductive path-forming parts in accordance with a pattern corresponding to a pattern of electrodes to be inspected and is individually produced according to a circuit board that is an object of inspection, whereas the dispersion type anisotropically conductive elastomer sheet can be used irrespective of the pattern of electrodes to be inspected and thus has general-purpose property. (3) Since the uneven distribution type anisotropically conductive elastomer sheet exhibits conductivity at its conductive path-forming parts in the thickness-wise direction thereof and does not exhibit conductivity at its insulating part, positioning of the conductive path-forming parts to electrodes to be inspected is required when the uneven distribution type anisotropically conductive elastomer sheet is used, whereas the dispersion type anisotropically conductive elastomer sheet exhibits conductivity over the whole surface thereof in the thickness-wise direction thereof, and so positioning to the electrodes to be inspected is unnecessary, and an electrically connecting operation becomes easy. On the other hand, in the uneven distribution type anisotropically conductive elastomer sheet, the insulating part mutually insulating adjacent conductive path-forming parts is formed between the adjacent conductive path-forming parts, so that the uneven distribution type anisotropically conductive elastomer sheet has the advantage of having performance that electrical connection to respective electrodes to be inspected can be achieved with high reliability in a state that necessary insulating property has been retained between adjacent electrodes to be inspected even about a circuit board, in which the electrodes to be inspected are arranged at a small pitch, i.e., having high resolving power compared with the dispersion type anisotropically conductive elastomer sheet.
In an inspection apparatus for circuit board, which is equipped with such an adaptor as described above, a circuit board (hereinafter also referred to as �circuit board to be inspected�), which is an object of inspection, is conveyed in an inspecting region by, for example, a conveying mechanism of the rail-conveying type having a conveyor belt and a guide rail, the anisotropically conductive elastomer sheet in the adaptor is brought into contact with electrodes (hereinafter also referred to as �electrodes to be inspected�) of the circuit board conveyed to the inspecting region, and the anisotropically conductive elastomer sheet is pressurized in the thickness-wise direction thereof, whereby electrical connection of the electrodes to be inspected of the circuit board to be inspected to the inspection electrodes in the inspection electrode device is achieved. In this state, necessary electrical inspection as to the circuit board to be inspected is conducted. After electrical inspection as to one circuit board to be inspected is conducted, the pressurization against the circuit board to be inspected is released, the circuit board to be inspected is conveyed from the inspecting region to a proper place, another circuit board to be inspected is conveyed to the inspecting region, and the same operation as described above is repeated on said another circuit board to be inspected, thereby conducting electrical inspection (see, for example, Patent Art. 6).
Patent Art. 1: Japanese Patent Application Laid-Open. No. 249924/1994; Patent Art. 2: Japanese Patent Application Laid-Open No. 2001-235492; Patent Art. 3: Japanese Patent Application Laid-Open No. 93393/1976; Patent Art. 4: Japanese Patent Application Laid-Open No. 147772/1978; Patent Art. 5: Japanese Patent Application Laid-Open No. 250906/1986; Patent Art. 6: Japanese Patent Application Laid-Open No. 258350/1995; Patent Art. 7: Japanese Patent Application Laid-Open No. 2001-185260; Patent Art. 8: Japanese Patent Application Laid-Open No. 2001-185258; Patent Art. 9: Japanese Patent Application Laid-Open No. 2003-77560. DISCLOSURE OF THE INVENTION The present invention has been made on the basis of the foregoing circumstances and has as its first object the provision of an adaptor for inspection of circuit boards, by which an inspection operation can be smoothly carried out even when electrical inspection is continuously conducted on a great number of circuit boards to be inspected, the original service life of an anisotropically conductive elastomer sheet can be attained, and the anisotropically conductive elastomer sheet can be easily replaced by a new one when the anisotropically conductive elastomer sheet suffers from trouble.
BRIEF DESCRIPTION OF THE DRAWINGS [FIG. 1] is a cross-sectional view illustrating the construction of an adaptor for inspection of circuit boards according to the first embodiment of the present invention.
DESCRIPTION OF CHARACTERS 1 Circuit board to be inspected
14 a Connecting electrode for current supply
14 b Connecting electrode for voltage measurement
16 a Patterned wiring part
16 b Via hole
16 c Interlayer patterned wiring part
The wiring board 11 for connection has an insulating substrate 12, and a plurality of connecting electrodes 13 to be electrically connected to electrodes to be inspected of the circuit board to be inspected are formed on a front surface (upper surface in FIG. 1) of this insulating substrate 12 as also shown in FIG. 2. These connecting electrodes 13 are arranged in accordance with a pattern corresponding to a pattern of the electrodes to be inspected of the circuit board to be inspected. Further, an insulating layer 17 is formed on the front surface of the insulating substrate 12 in such a manner that the respective connecting electrodes 13 are exposed. On the other hand, a plurality of terminal electrodes 15 to be electrically connected to inspection electrodes in an inspection electrode device are formed on a back surface (lower surface in FIG. 1) of the insulating substrate 12. These terminal electrodes 15 are arranged in accordance with a pattern corresponding to a pattern of a plurality of inspection electrodes selected from among a great number of inspection electrodes in the inspection electrode device and arranged at positions of lattice points having a pitch of, for example, 2.54 mm, 1.8 mm, 1.27 mm, 1.06 mm, 0.8 mm, 0.75 mm, 0.5 mm, 0.45 mm, 0.3 mm or 0.2 mm. Further, an insulating layer 18 is formed on the back surface of the insulating substrate 12 in such a manner that the respective terminal electrodes 13 are exposed. Each of the connecting electrodes 13 is electrically connected to proper terminal electrode 15 through an internal wiring 16 composed of a patterned wiring part 16 a formed on the front surface of the insulating substrate 12 and a via hole 16 b extending through in a thickness-wise direction of the insulating substrate 12.
In the present invention, the term �surface roughness� means a center-line average surface roughness Ra prescribed in JIS B 0601.
The interiors of the through-holes 16H formed in the laminated material are then subjected to an electroless plating treatment and an electroplating treatment, thereby forming via holes 16 b connected to the thin metal layers 13A and 15A as shown in FIG. 5. Thereafter, the thin metal layers 13A and 15A are respectively subjected to a photo-etching treatment, thereby forming patterned wiring parts 16 a and connecting electrodes 13 on the front surface of the insulating substrate 12 as well as forming terminal electrodes 15 on the back surface of the insulating substrate 12 as shown in FIG. 6.
The hydroxyl group-containing liquid silicone rubber is also obtained by subjecting a cyclic siloxane to anionic polymerization in the presence of a catalyst, using, for example, dimethylhydrochloro-silane, methyldihydrochlorosilane or dimethylhydroalkoxysilane as a polymerization terminator and suitably selecting other reaction conditions (for example, amounts of the cyclic siloxane and polymerization terminator). As the catalyst for the anionic polymerization, may be used an alkali such as tetramethylammonium hydroxide or n-butylphosphonium hydroxide or a silanolate solution thereof. The reaction is conducted at a temperature of, for example, 80 to 130� C.
As the liquid silicone rubber, is preferably used that having a compression set of at most 35%, more preferably at most 20% as measured in the form of a cured product at 150� C. When this compression set is at most 35%, the resulting anisotropically conductive elastomer sheet 20 comes to have good durability when it is compressed repeatedly in its thickness-wise direction. It is hence preferable to have such a compression set.
As the liquid silicone rubber, is preferably used that having tear strength of at least 7 kN/m, more preferably at least 10 kN/m as measured in the form of a cured product at 23� C. When this tear strength is 7 kN/m or higher, the resulting anisotropically conductive elastomer sheet 20 comes to have good durability when it is compressed repeatedly in its thickness-wise direction. It is hence preferable to have such tear strength.
In the anisotropically conductive elastomer sheet 20, the number (the number of the conductive particles P for forming a conductive path in the thickness-wise direction; hereinafter also referred to as �number of conductive path-forming particles�) of the conductive particles P aligned in the thickness-wise direction thereof is preferably 3 to 20 particles, more preferably 5 to 15 particles. When the number of conductive path-forming particles is 3 particles or more, a scatter of an electric resistance value in such an anisotropically conductive elastomer sheet 20 becomes narrow. When the number of conductive path-forming particles is 20 particles or less on the other hand, the deformation of the chains of the conductive particles P does not become great upon compression of such an anisotropically conductive elastomer sheet 20, and so rise in resistance value is scarcely incurred. It is hence preferable to control the number of the conductive particles within such a range.
In order to surely exhibit such effects as described above, it is preferable to contain the antistatic agent in such a manner that the volume resistivity of the base material composed of the elastic polymeric substance forming the anisotropically conductive elastomer sheet 20 is 1�109 to 1�1013Ω�cm.
As a means for applying the parallel magnetic field to the molding material layer 20A, permanent magnets may also be used in place of the electromagnets. As such permanent magnets, are preferred those composed of alunico (Fe�Al�Ni�Co alloy), ferrite or the like in that the intensity of the parallel magnetic field within the above range is achieved.
The wiring board 11 for connection has an insulating substrate 12 of a multi-layer structure, and plural pairs 14 of connecting electrodes each composed of a pair of a connecting electrode 14 a for current supply and a connecting electrode 14 b for voltage measurement, which are electrically connected to the same electrode to be inspected and arranged in relation separated from each other, are formed on a front surface (upper surface in FIG. 17) of this insulating substrate 12 as also shown in FIG. 18. These pairs 14 of connecting electrodes each composed of the connecting electrode 14 a for current supply and the connecting electrode 14 b for voltage measurement are arranged in accordance with a pattern corresponding to a pattern of the electrodes to be inspected of the circuit board to be inspected. Further, an insulating layer 17 is formed on the front surface of the insulating substrate 12 in such a manner that the connecting electrodes 14 a for current supply and the connecting electrodes 14 b for voltage measurement in the respective pairs 14 of connecting electrodes are exposed. On the other hand, a plurality of terminal electrodes 15 to be electrically connected to inspection electrodes in an inspection electrode device are formed on a back surface (lower surface in FIG. 17) of the insulating substrate 12. These terminal electrodes 15 are arranged in accordance with a pattern corresponding to a pattern of a plurality of inspection electrodes selected from among a great number of inspection electrodes in the inspection electrode device and arranged at positions of lattice points having a pitch of, for example, 2.54 mm, 1.8 mm, 1.27 mm, 1.06 mm, 0.8 mm, 0.75 mm, 0.5 mm, 0.45 mm, 0.3 mm or 0.2 mm. Further, an insulating layer 18 is formed on the back surface of the insulating substrate 12 in such a manner that the respective terminal electrodes 15 are exposed. Each of the connecting electrodes 14 a for current supply and each of the connecting electrodes 14 b for voltage measurement are electrically connected to proper terminal electrode 15 through an internal wiring 16 composed of a patterned wiring part 16.a formed on the front surface of the insulating substrate 12, a via hole 16 b extending through in a thickness-wise direction of the insulating substrate 12 and an interlayer patterned wiring part 16 c formed between the layers of the insulating substrate 12. On the other hand, other constitutions are basically the same as the wiring board 11 for connection in the adaptor 10 for inspection of circuit boards according to the first embodiment.
In the adaptor 10 for inspection of circuit boards according to the second embodiment, a circuit board to be inspected, which has been conveyed to an inspection-executing region in an inspection apparatus by a proper conveying mechanism, is pressed by the anisotropically conductive elastomer sheet 20, whereby the anisotropically conductive elastomer sheet 20 is in a state pinched by the circuit board to be inspected and the wiring board 11 for connection. As a result, in the anisotropically conductive elastomer sheet 20, conductive paths by the chains of the conductive particles P are formed between an electrode to be inspected of the circuit board to be inspected and each of the electrode 14 a for current supply and the electrode 14 b for voltage measurement in the pair 14 of connecting electrodes of the wiring board 11 for connection, whereby both connecting electrode 14 a for current supply and connecting electrode 14 b for voltage measurement in one pair 14 of connecting electrodes are electrically connected to one electrodes to be inspected in the circuit board to be inspected at the same time. In this state, necessary electrical inspection as to the circuit board to be inspected, i.e., measurement of an electric resistance of each wiring pattern is conducted.
The upper-side jig 30 for inspection is constructed by arranging the adaptor 10 (hereinafter also referred to as �adaptor� merely) for inspection of circuit boards of the construction shown in FIG. 1 through an anisotropically conductive elastomer sheet 35 on a front surface (lower surface in FIG. 19) of an inspection electrode device 40. The connecting electrodes 13 in the wiring board 11 for connection of this adaptor 10 are arranged in accordance with a pattern corresponding to a pattern of the electrodes (hereinafter also referred to as �one surface-side electrodes to be inspected�) 2 to be inspected on one surface side in the circuit board 1 to be inspected. Incidentally, in FIG. 19, the connecting electrodes 13 and terminal electrodes 15 are illustrated seeing through the insulating layers 17 and 18.
The lower-side jig 50 for inspection is constructed by arranging the adaptor 10 of the construction shown in FIG. 1 through an anisotropically conductive elastomer sheet 55 on a front surface (upper surface in FIG. 19) of an inspection electrode device 60. The connecting electrodes 13 in the wiring board 11 for connection of this adaptor 10 are arranged in accordance with a pattern corresponding to a pattern of the electrodes (hereinafter also referred to as �the other surface-side electrodes to be inspected�) 3 to be inspected on the other surface side in the circuit board 1 to be inspected. Incidentally, in FIG. 19, the connecting electrodes 13 and terminal electrodes 15 are illustrated seeing through the insulating layers 17 and 18.
The upper-side jig 30 for inspection is constructed by arranging the adaptor 10 of the construction shown in FIG. 17 through an anisotropically conductive elastomer sheet 35 on a front surface (lower surface in FIG. 20) of an inspection electrode device 40. Pairs 14 of connecting electrodes in the wiring board 11 for connection of this adaptor 10 are arranged in accordance with a pattern corresponding to a pattern of the one surface-side electrodes 2 to be inspected in the circuit board 1 to be inspected. Incidentally, in FIG. 20, connecting electrodes 14 a for current supply and connecting electrodes 14 b for voltage measurement of the pairs 14 of connecting electrodes and terminal electrodes 15 are illustrated seeing through the insulating layers 17 and 18. The inspection electrode device 40 and anisotropically conductive elastomer sheet 35 are basically of the same construction as the inspection electrode device 40 and anisotropically conductive elastomer sheet 35 in the upper-side jig 30 for inspection of the inspection apparatus for circuit boards according to the first embodiment.
The lower-side jig 50 for inspection is constructed by arranging the adaptor 10 of the construction shown in FIG. 17 through an anisotropically conductive elastomer sheet 55 on a front surface (upper surface in FIG. 20) of an inspection electrode device 60. Pairs 14 of connecting electrodes in the wiring board 11 for connection of this adaptor 10 are arranged in accordance with a pattern corresponding to a pattern of the other surface-side electrodes 3 to be inspected in the circuit board 1 to be inspected. Incidentally, in FIG. 20, connecting electrodes 14 a for current supply and connecting electrodes 14 b for voltage measurement of the pairs 14 of connecting electrodes and terminal electrodes 15 are illustrated seeing through the insulating layers 17 and 18. The inspection electrode device 60 and anisotropically conductive elastomer sheet 55 are basically of the same construction as the inspection electrode device 60 and anisotropically conductive elastomer sheet 55 in the lower-side jig 50 for inspection of the inspection apparatus for circuit boards according to the first embodiment.
For example, the lower-side supporting mechanism 65 is then moved upward to move the lower-side jig 50 for inspection in a direction (upward in FIG. 20) approaching the upper-side jig 30 for inspection, thereby bringing each of the adaptor 10 of the upper-side jig 30 for inspection and the adaptor 10 of the lower-side jig 50 for inspection into contact under pressure with the circuit board 1 to be inspected. As a result, in the upper-side jig 30 for inspection, the anisotropically conductive elastomer sheet 20 in the adaptor 10 is in a state pinched by the circuit board 1 to be inspected and the wiring board 11 for connection, whereby each of the one surface-side electrodes 2 to be inspected of the circuit board 1 to be inspected is electrically connected to both of the connecting electrode 14 a for current supply and connecting electrode 14 b for voltage measurement in each of the pairs 14 of connecting electrodes of the wiring board 11 for connection. The anisotropically conductive elastomer sheet 35 is also in a state pinched by the wiring board 11 for connection and the inspection electrode device 40, whereby the terminal electrodes 15 of the wiring board 11 for connection are electrically connected to the respective inspection electrodes 41 of the inspection electrode device 40. On the other hand, in the lower-side jig 50 for inspection, the anisotropically conductive elastomer sheet 20 in the adaptor 10 is in a state pinched by the circuit board 1 to be inspected and the wiring board 11 for connection, whereby each of the other surface-side electrodes 3 to be inspected of the circuit board 1 to be inspected is electrically connected to both of the connecting electrode 14 a for current supply and connecting electrode 14 b for voltage measurement in each of the pairs 14 of connecting electrodes of the wiring board 11 for connection. The anisotropically conductive elastomer sheet 55 is also in a state pinched by the wiring board 11 for connection and the inspection electrode device 60, whereby the terminal electrodes 15 of the wiring board 11 for connection are electrically connected to the respective inspection electrodes 61 of the inspection electrode device 60.
In this inspectable state, necessary electrical inspection on the circuit board 1 to be inspected is carried out. More specifically, a current of a fixed value is supplied between the connecting electrodes 14 a for current supply of the wiring board 11 for connection in the adaptor 10 of the upper-side jig 30 for inspection and the connecting electrodes 14 a for current supply of the wiring board 11 for connection in the adaptor 10 of the lower-side jig 50 for inspection, and one among a plurality of the connecting electrodes 14 b for voltage measurement of the wiring board 11 for connection in the adaptor 10 of the upper-side jig 30 for inspection is designated to measure a voltage between the designated one connecting electrode 14 b for voltage measurement and a connecting electrode 14 b for voltage measurement of the wiring board 11 for connection in the adaptor 10 of the lower-side jig 50 for inspection, which has been electrically connected to the other surface-side electrode 3 to be inspected corresponding to the one surface-side electrode 2 to be inspected, which has been electrically connected to the designated connecting electrode 14 b for voltage measurement, thereby obtaining an electric resistance value of a wiring pattern formed between said one surface-side electrode 2 to be inspected, which has been electrically connected to the designated one connecting electrode 14 b for voltage measurement, and the other surface-side electrode 3 to be inspected corresponding to this electrode 2 on the basis of the thus-obtained voltage value. The designated connecting electrode 14 b for voltage measurement is successively changed, thereby conducting measurement of electric resistances of wiring patterns respectively formed between all of the one surface-side electrodes 2 to be inspected and their corresponding other surface-side electrodes 3 to be inspected.
A laminated material obtained by laminating thin metal layers 13A and 15A on both surfaces of a flat plate-like insulating substrate 12 is first provided as shown in FIG. 3. In this laminated material, a plurality of through-holes 16H each extending through in a thickness-wise direction of the laminated material are formed in accordance with a pattern corresponding to a pattern of terminal electrodes 15 to be formed as shown in FIG. 4. The interiors of the through-holes 16H formed in the laminated material are then subjected to an electroless plating treatment and an electroplating treatment, thereby forming via holes 16 b connected to the thin metal layers 13A and 15A as shown in FIG. 5.
The thin metal layer 13A formed on the front surface of the insulating substrate 12 is then subjected to a photo-etching treatment, thereby forming a plurality of base layers 13B for connecting electrodes on the front surface of the insulating substrate 12 and patterned wiring parts 16 a for electrically connecting the base layers 13B for connecting electrodes to the via holes 16 b as shown in FIG. 22. Before the photo-etching treatment is conducted, a protecting seal 19 is arranged in advance so as to cover the thin metal layer 15A formed on the back surface of the insulating substrate 12. Thereafter, as shown in FIG. 23, an insulating layer 17 is formed on the front surface of the insulating substrate 12 in such a manner that the respective base layers 13B for connecting electrodes are exposed. The respective base layers 13B for connecting electrodes are then subjected to an electroplating treatment by using the thin metal layer 15A formed on the bask surface of the insulating substrate 12 as a common electrode, thereby forming connecting electrodes 13 protruding from a surface of the insulating layer 17 as shown in FIG. 24.
After the protecting seal 19 is then removed from the thin metal layer 15A, the thin metal layer 15A is subjected to a photo-etching treatment, thereby forming a plurality of terminal electrodes 15 electrically connected to the respective via holes 16 b on the back surface of the insulating substrate 12 as shown in FIG. 25. As shown in FIG. 26, an insulating layer 18 is formed on the back surface of the insulating substrate 12 in such a manner that the respective terminal electrodes 15 are exposed, thereby obtaining the wiring board 11 for connection.
In the following Example and Comparative Example, the value of surface roughness is indicated as a value obtained by measuring a center-line average surface roughness Ra under conditions of a cutoff value of 0.8 mm and a measurement length of 0.25 mm in accordance with JIS B 0601 using a three-dimensional surface structure analyzing microscope �New View 200� manufactured by Zygo Co.
Dimensions: 100 mm (length)�100 mm (breadth)�0.8 mm (thickness); Number of upper surface-side electrodes to be inspected: 7,312; Diameter of upper surface-side electrodes to be inspected: 0.3 mm; Minimum pitch of upper surface-side electrodes to be inspected: 0.4 mm; Number of lower surface-side electrodes to be inspected: 3,784; Diameter of lower surface-side electrodes to be inspected: 0.3 mm; Minimum pitch of lower surface-side electrodes to be inspected: 0.4 mm. Example 1 An inspection apparatus for circuit boards for inspecting the above-described circuit board for evaluation, which was adapted to an inspection section of a rail-conveying type automatic circuit board inspection machine (manufactured by NIDEC-READ CORPORATION, trade name: STARREC V5), was produced in accordance with the construction shown in FIG. 19 and FIG. 21 in the following manner.
In the above-described process, as the addition type silicone rubber, was used silicon rubber, in which both Solution A and Solution B had a viscosity of 500 P, and a cured product thereof had a compression set of 6% at 150� C. (by a measuring method in accordance with JIS K 6249) and tear strength of 25 kN/m at 23� C. (by a measuring method in accordance with JIS K 6249).
After a frame-like spacer having a rectangular opening of 120 mm�200 mm and a thickness of 0.08 mm was then arranged on a molding surface of the other surface-side molding member, the molding material prepared was applied to within the opening of the spacer, and one surface-side molding member was arranged on this molding material in such a manner that the molding surface thereof comes into contact with the molding material.
In the above-described process, a non-glossy surface (surface roughness: 1 μm) of a polyester resin sheet (product of Toray Industries, Inc.; trade name �Mat Lumirror S10�) having a thickness of 0.1 mm was used as the molding surface of one surface-side molding member, and a glossy surface (surface roughness: 0.04 μm) of a polyester resin sheet (product of Toray Industries, Inc.; trade name �Mat Lumirror S10�) having a thickness of 0.1 mm was used as the molding surface of the other surface-side molding member.
Electromagnets were then arranged on respective back surfaces of the one surface-side molding member and the other surface-side molding member to subject the molding material layer to a curing treatment under conditions of 120� C. for 30 minutes while applying a parallel magnetic field of 0.3 T to the molding material layer in its thickness-wise direction, thereby producing a rectangular anisotropically conductive elastomer sheet having a thickness of 0.1 mm.
The thus-obtained anisotropically conductive elastomer sheet had a surface roughness of 1.4 μm on one surface thereof and a surface roughness of 0.12 μm on the other surface thereof and contained the conductive particles in a proportion of 12% in terms of a volume fraction. This anisotropically conductive elastomer sheet is referred to as �anisotropically conductive elastomer sheet (a)�.
The above-described anisotropically conductive elastomer sheet (a) was arranged on the front surface of this wiring board for connection, thereby constructing the adaptor (hereinafter also referred to as �upper-side adaptor�) for inspection of circuit boards on the upper side.
The above-described anisotropically conductive elastomer sheet (a) was arranged on the front surface of this wiring board for connection, thereby constructing the adaptor (hereinafter also referred to as �lower-side adaptor�) for inspection of circuit boards on the lower side.
The inspection apparatus for circuit boards was installed in the inspection section of the rail-conveying type automatic circuit board inspection machine �STARREC V5� (manufactured by NIDEC-READ CORPORATION) to conduct a test of connection stability and a test of separating tendency of the anisotropically conductive elastomer sheet in the adaptor for inspection of circuit boards in accordance with the following respective methods.
The inspection apparatus for circuit boards was installed in the rail-conveying type automatic circuit board inspection machine �STARREC V5� (manufactured by NIDEC-READ CORPORATION), and the circuit board for evaluation was set in the inspection region of the inspection apparatus for circuit boards. A pressurizing operation was then conducted against the circuit board for evaluation under a prescribed press load. In this state, a current of 1 mA was applied between the connecting electrodes of the wiring board for connection in the upper-side adaptor and the connecting electrodes of the wiring board for connection in the lower-side adaptor to measure an electric resistance value as to the circuit board for evaluation, and the pressurization against the circuit board for evaluation was then released. This operation for measuring the electric resistance value was conducted 10 times in total. An inspection point (hereinafter also referred to as �NG inspection point�) at which the electric resistance value measured reached 100Ω or higher was judged to be defective conduction to calculate out a proportion (hereinafter also referred to as �proportion of NG inspection points�) of the number of the NG inspection points to the total number of inspection points (total number of upper-side electrodes to be inspected of the circuit board for evaluation). The step of determining such a proportion of NG inspection points was conducted by changing the press load stepwise within a range of 100 to 250 kgf, thereby determining a minimum press load under which the proportion of NG inspection points was lower than 0.01%.
The minimum press load determined in such a manner is referred to as �connectable load�. The smaller connectable load value indicates that the connection stability is higher.
The inspection apparatus for circuit boards was installed in the inspection region of the rail-conveying type automatic circuit board inspection machine �STARREC V5�, and the circuit board for evaluation was conveyed in the inspection region of the inspection apparatus for circuit boards by the rail-conveying type automatic circuit board inspection machine �STARREC V5�. A pressurizing operation was then conducted against the circuit board for evaluation under conditions of a press load of 150 kgf. In this state, a current of 1 mA was applied between the connecting electrodes of the wiring board for connection in the upper-side adaptor and the connecting electrodes of the wiring board for connection in the lower-side adaptor to measure an electric resistance value as to the circuit board for evaluation, and the pressurization against the circuit board for evaluation was then released. This operation for measuring the electric resistance value was conducted 10 times in total. Thereafter, the circuit board for evaluation was conveyed out of the inspection region of the inspection apparatus for circuit boards. This process was conducted on 100 circuit boards for evaluation to determine the number of times (hereinafter referred to as �the number of conveyance errors�) where the anisotropically conductive elastomer sheet (a) separated from the wiring board for connection and adhered to the circuit board for evaluation when the circuit board for evaluation was conveyed out of the inspection region of the inspection apparatus for circuit boards. The results are shown in Table 1
Comparative Example 1 In the inspection apparatus for circuit boards produced in Example 1, the following anisotropically conductive elastomer sheet (b) was used in place of the anisotropically conductive elastomer sheet (a) to construct an inspection apparatus for circuit boards, and the test of connection stability and the test of separating tendency were conducted on this inspection apparatus in the same manner as in Example 1. The results are shown in Table 1.
After a frame-like spacer having a rectangular opening of 120 mm�200 mm and a thickness of 0.08 mm was arranged on a molding surface of the other surface-side molding member, a molding material prepared in the same manner as in Example 1 was applied to within the opening of the spacer, and one surface-side molding member was arranged on this molding material in such a manner that the molding surface thereof comes into contact with the molding material.
In the above-described process, polyester resin sheets (products of Toray Industries, Inc.; trade name �Mat Lumirror S10�) having a thickness of 0.1 mm were used as the one surface-side molding member and the other surface-side molding member with the glossy surfaces (surface roughness: 0.04 μm) thereof used as the molding surfaces.
The thus-obtained anisotropically conductive elastomer sheet had a surface roughness of 0.13 μm on one surface thereof and a surface roughness of 0.12 μm on the other surface thereof and contained the conductive particles in a proportion of 12% in terms of a volume fraction. This anisotropically conductive elastomer sheet is referred to as �anisotropically conductive elastomer sheet (b)�.
Press load (kgf)
errors (time)
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS4740657 *Feb 12, 1987Apr 26, 1988Hitachi, Chemical Company, LtdPolymeric core coated with thin metal layer; particlesUS5109596 *Nov 13, 1989May 5, 1992Mania Gmbh & Co.Adapter arrangement for electrically connecting flat wire carriersUS5317255 *Feb 11, 1992May 31, 1994Soken International Consultants Co., Ltd.Electric inspection unit using anisotropically electroconductive sheetUS5818700 *Sep 24, 1996Oct 6, 1998Texas Instruments IncorporatedMicroelectronic assemblies including Z-axis conductive filmsUS6447308 *Oct 31, 2001Sep 10, 2002Paricon Technologies CorporationMethod and device for increasing elastomeric interconnection robustnessUS7059874 *Mar 18, 2003Jun 13, 2006Paricon Technologies, Inc.Anisotropic conductive elastomer based electrical interconnect with enhanced dynamic rangeJP2000294043A Title not availableJP2003077560A Title not availableJPH11111064A Title not available* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS7731517 *Nov 25, 2008Jun 8, 2010Physical Optics CorporationInherently sealed electrical connectorUS8469741Apr 29, 2009Jun 25, 20133M Innovative Properties CompanyStretchable conductive connectorUS8700118Apr 29, 2009Apr 15, 20143M Innovative Properties CompanyBiomedical sensor systemWO2009134823A2 *Apr 29, 2009Nov 5, 20093M Innovative Properties CompanyStretchable conductive connector* Cited by examinerClassifications U.S. Classification324/755.08, 439/66, 439/91, 324/763.01International ClassificationH01R4/58, G01R1/06, G01R31/28, H01R13/24, G01R31/02, H01R11/01Cooperative ClassificationH01R2201/20, G01R31/2808, H01R12/523, H01R13/2414European ClassificationG01R31/28B4B, H01R9/09F3, H01R13/24A1Legal EventsDateCodeEventDescriptionSep 14, 2011FPAYFee paymentYear of fee payment: 4Mar 3, 2008ASAssignmentOwner name: JSR CORPORATION, JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KIMURA, KIYOSHI;SHIMODA, SUGIRO;REEL/FRAME:020586/0989Effective date: 20060719RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google