Source: http://www.google.com/patents/US7541823?ie=ISO-8859-1&dq=oakley+D523,461
Timestamp: 2014-09-22 17:48:40
Document Index: 15176253

Matched Legal Cases: ['art 25', 'art 25', 'art: 4', 'art: 3', 'art: 4', 'art: 4']

Patent US7541823 - Circuit board checker and circuit board checking method - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsThe present invention provides an inspection apparatus for circuit board for conducting electrical inspection by electrically connecting inspection object electrodes of the circuit board to a plurality of inspection electrodes formed in accordance with a pattern corresponding to the inspection object...http://www.google.com/patents/US7541823?utm_source=gb-gplus-sharePatent US7541823 - Circuit board checker and circuit board checking methodAdvanced Patent SearchPublication numberUS7541823 B2Publication typeGrantApplication numberUS 11/770,135Publication dateJun 2, 2009Filing dateJun 28, 2007Priority dateJan 17, 2003Fee statusPaidAlso published asEP1585374A1, US7279914, US20060043991, US20080012593, WO2004077904A1Publication number11770135, 770135, US 7541823 B2, US 7541823B2, US-B2-7541823, US7541823 B2, US7541823B2InventorsSugiro Shimoda, Kiyoshi KimuraOriginal AssigneeJsr CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (9), Classifications (10), Legal Events (1) External Links: USPTO, USPTO Assignment, EspacenetCircuit board checker and circuit board checking methodUS 7541823 B2Abstract The present invention provides an inspection apparatus for circuit board for conducting electrical inspection by electrically connecting inspection object electrodes of the circuit board to a plurality of inspection electrodes formed in accordance with a pattern corresponding to the inspection object electrodes through an anisotropically conductive sheet, wherein each of an upper-side board-compressing member and a lower-side board-compressing member respectively arranged on an upper side and lower side of the inspection object circuit board is provided on upper-side base plate and lower-side base plate supported by a plurality of supports of support-infixing plates, and an upper-side supporting point and a lower-side supporting point corresponds to the respective supports on the respective base plates are arranged at positions different from each other on a plane of projection in a thickness-wise direction of the upper-side board-compressing member and lower-side board-compressing member when the inspection apparatus is seen through from above, whereby being capable of conducting the inspection high in reliability even to the circuit board small in such as size of the inspection object electrodes, and an inspection process for circuit board.
1. An inspection apparatus for circuit board for measuring an electric resistance of an inspection object circuit board by electrically connecting a pair of inspection electrodes formed of an electrode for current supply and an electrode for voltage measurement arranged in relation separated from each other to each of a plurality of inspection object electrodes formed on the inspection object circuit board, through an anisotropically conductive sheet, comprising:
wherein the upper-side board-compressing member and the lower-side board-compressing member each have plural pairs of inspection electrodes and are respectively provided on base plates supported by a plurality of supports infixed into support-infixing plates, and upper-side supporting points correspond to the upper-side supports on the upper-side base plate related to the upper-side board-compressing member and lower-side supporting points correspond to the lower-side supports on the lower-side base plate related to the lower-side board-compressing member are arranged at positions different from each other on a plane of projection in a thickness-wise direction of the upper-side board-compressing member and the lower-side board-compressing member when the inspection apparatus is seen through from above, and
wherein the upper-side supporting points and the lower-side supporting points are formed in a lattice on the upper-side base plate and on the lower-side base plate, respectively, and on the plane of projection in the thickness-wise direction of the upper-side board-compressing member and the lower-side board-compressing member, only one of the lower-side supporting points is arranged within an upper-side unit region partitioned by adjacent 4 of the upper-side supporting points, and only one of the upper-side supporting points is arranged within a lower-side unit region partitioned by adjacent 4 of the lower-side supporting points.
2. The inspection apparatus for circuit board according to claim 1, wherein the upper-side base plate and the lower-side base plate are pressed, respectively, by the upper-side supports and the lower-side supports, thereby bringing about a measurable state that the inspection object circuit board is compressed by the upper-side board-compressing member and the lower-side board-compressing member to carry out the measurement of the electric resistance.
3. The inspection apparatus for circuit board according to claim 1, wherein, in a measurable state, a complex stack composed of the inspection object circuit board, and the upper-side board-compressing member and the lower-side board-compressing member for compressing the inspection object circuit board is deformed by shifting in the thickness-wise direction together with the upper-side base plate and the lower-side base plate, at positions, over a whole body, respectively pressed by the upper-side supports and the lower-side supports in accordance with the upper-side supporting points and the lower-side supporting points.
4. The inspection apparatus for circuit board according to claim 3, wherein, in a measurable state, a gap in the thickness-wise direction of the complex stack between a tip level in the upper-side support and a tip level in the lower-side support is smaller than a total thickness of the complex stack, the upper-side base plate and the lower-side base plate.
5. The inspection apparatus for circuit board according to claim 1, wherein a thickness of each of the upper-side base plate and the lower side base plate is at most 5 mm.
6. The inspection apparatus for circuit board according to claim 1, wherein clearances between adjacent ones of the upper-side supporting points related to the upper-side unit region, and between adjacent ones of the lower-side supporting points related to the lower-side unit region are each 10 to 100 mm.
7. The inspection apparatus for circuit board according to claim 1, wherein the upper-side base plate and the lower-side base plate are each composed of a glass fiber-reinforced epoxy resin and have a thickness of 2 to 5 mm.
8. An inspection process for circuit board, comprising:
using the inspection apparatus for circuit board according to claim 1, and
in a measurable state that the inspection object circuit board is compressed by the upper-side board-compressing member and the lower-side board-compressing member by pressing the upper-side base plate and the lower-side base plate by the upper-side supports and the lower-side supports, respectively, deforming a complex stack composed of the inspection object circuit board and the upper-side board-compressing member and the lower-side board-compressing member for compressing the inspection object circuit board by shifting in the thickness-wise direction together with the upper-side base plate and the lower-side base plate, at positions, over a whole body, respectively pressed by the upper-side supports and the lower-side supports in accordance with the upper-side supporting points and the lower-side supporting points, so as to carry out the measurement of the electric resistance.
CROSS-REFERENCE TO RELATED APPLICATIONS This application is a Divisional of and claims the benefit of priority under 35 U.S.C. � 120 from U.S. Ser. No. 10/542,366, filed Jul. 14, 2005 now U.S. Pat No. 7,279,914, which claims the benefit of priority under 35 U.S.C. � 120 from Application Serial No. PCT/JP04/00242 filed Jan. 15, 2004, and under 35 U.S.C. � 119 from Japanese Patent Application priority documents 2003-010074 filed in Japan on Jan. 17, 2003, 2003-203846 filed in Japan on Jul. 30, 2003, the entire contents of each of which are incorporated by reference herein.
TECHNICAL INVENTION The present invention relates to an inspection apparatus for circuit board and an inspection process for circuit board.
BACKGROUND ART In electrical inspection of a circuit board, it is conducted to measure an electric resistance between electrodes of an inspection object circuit board (hereinafter also referred to as �circuit board to be inspected�).
In the measurement of an electric resistance of a circuit board, there has heretofore been adopted, for example, a means in which probes PA and PD for current supply and probes PB and PC for voltage measurement are pressed against and brought into respective contact with 2 inspection object electrodes 81 and 82 (hereinafter also referred to as �electrodes to be inspected�), which have been electrically connected to each other in a circuit board 80 to be inspected, as illustrated in FIG. 15, a current is supplied between the proves PA and PD for current supply from a power supply device 83 in this state, and a voltage signal detected by the probes PB and PC for voltage measurement at this time is processed in an electric signal processor 84, thereby determining an electric resistance value between the electrodes 81 and 82 to be inspected.
In such an inspection apparatus (hereinafter also referred to as �first conventional apparatus�) 90, the upper-side board-compressing member 91A and lower-side board-compressing member 91B are respectively provided on base plates 96A and 96B supported by a plurality of supports 94A and 94B respectively infixed into flat plate-like support-infixing plates 95A and 95B and vertically extending from the support-infixing plates 95A and 95B, and as illustrated in FIG. 17, supporting points 97A formed by the supports 94A on the base plate 96A and supporting points 97B formed by the supports 94B on the base plate 96B on a plane M4 of projection in a thickness-wise direction of the base plates 96A, 96B when the first conventional apparatus 90 is seen through from above are located at the same positions. In FIG. 17, the supporting points (hereinafter also referred to as �upper-side supporting points�) 97A related to the upper-side board-compressing member 91A and the supporting points (hereinafter also referred to as �lower-side supporting point�) 97B related to the lower-side board-compressing member 91B are indicated by a black circle and a white circle, respectively.
In this inspection apparatus (hereinafter also referred to as �second conventional apparatus�) 100, anisotropically conductive sheets 103 are provided on the respective surfaces of the circuit boards 102 and 107 for inspection. In FIG. 18, reference numeral 108 designates electrode devices electrically connected to the respective circuit boards 102 and 107 for inspection and a circuit board for inspection of a tester (not illustrated), and reference numeral 109 designates anisotropically conductive sheet.
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 a light-weight inspection apparatus for circuit board capable of conducting electrical inspection of a circuit board with high reliability even when the inspection object circuit board has inspection object electrodes small in size and pitch or clearance.
According to the present invention, there is thus provided an inspection apparatus for circuit board for conducting electrical inspection of an inspection object circuit board by electrically connecting inspection object electrodes of the inspection object circuit board to a plurality of inspection electrodes formed in accordance with a pattern corresponding to the inspection object electrodes through an anisotropically conductive sheet, which comprises:
EFFECTS OF THE INVENTION According to the inspection apparatus for circuit board of the present invention, points of application of the pressing force by the upper-side supports and points of application of the pressing force by the lower-side supports are formed at positions different from one another on the plane of projection in the thickness-wise direction of the upper-side board-compressing member and lower-side board-compressing member in the measurable state, and the complex stack, in which the inspection object circuit board is compressed, is, as it were, forcedly deformed together with the base plates in accordance with the upper-side supporting points and lower-side supporting points forming the points of application, thereby inhibiting the pressing force from concentrating on the points of application. As a result, since the pressure distribution in the inspection object circuit board is uniformed, a state that all the inspection object electrodes in the inspection object circuit board have been evenly electrically connected to inspection electrodes corresponding to each of the inspection object electrodes can be attained, so that the electrical inspection of the circuit board can be conducted with high accuracy.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates the construction of an exemplary inspection apparatus for circuit board according to the present invention together with an inspection object circuit board.
DESCRIPTION OF CHARACTERS 1 Inspection object circuit board,
22 Proximal part,
BEST MODE FOR CARRYING OUT THE INVENTION The mode for carrying out the present invention will hereinafter be described in detail.
This inspection apparatus (hereinafter also referred to as �first inspection apparatus�) 10 is used for conducting electrical inspection of a circuit board by measuring electric resistance between electrodes in the circuit board. In this inspection apparatus, an upper-side board-compressing member 30 arranged on an upper side of an inspection object circuit board (circuit board to be inspected) 1 and provided with an anisotropically conductive sheet 33 on its front surface (lower surface in FIG. 1), and a lower-side board-compressing member 50 arranged on a lower side of the circuit board 1 to be inspected and provided with an anisotropically conductive sheet 53 on its front surface (upper surface in FIG. 1) are arranged so as to be vertically opposed to each other.
The upper-side board-compressing member 30 is provided on a front surface (lower surface in FIG. 1) of an upper-side base plate 21 supported by a plurality (4 supports are illustrated in FIG. 1) of upper-side supports 22 infixed into a flat plate-like upper-side support-infixing plate 23 composed of, for example, a laminate (trade name: �SUMILITE�, product of SUMITOMO BAKELITE Co., Ltd.) of a phenol resin containing a fine thread cloth and vertically extending from the upper-side support-infixing plate 23.
The lower-side board-compressing member 50 is provided on a front surface (upper surface in FIG. 1) of a lower-side base plate 25 supported by a plurality (3 supports are illustrated in FIG. 1) of lower-side supports 26 infixed into a flat plate-like lower-side support-infixing plate 27 composed of, for example, a laminate (trade name: �SUMILITE�, product of SUMITOMO BAKELITE Co., Ltd.) of a phenol resin containing a fine thread cloth and vertically extending from the lower-side support-infixing plate 27.
The upper-side supporting point 21A related to the upper-side board-compressing member 30 and the lower-side supporting point 25B related to the lower-side board-compressing member 50 are arranged at different positions on a plane of projection (hereinafter also referred to as �specific plane of projection�) in a thickness-wise direction of the upper-side board-compressing member 30 and lower-side board-compressing member 50 when the first inspection apparatus 10 is seen through from above (from above in FIG. 1).
The degree of flexibility required of the upper-side base plate 21 and lower-side base plate 25 (hereinafter also referred to as �specific base plates�) is as follows.
In the embodiment illustrated, �the thickness of the lower-side base plate 25� indicates a thickness of a portion where the projected part 25A is formed. The projected height of this projected part 25A is preferably 0.5 to 5 mm.
In this description, the term �measurable state�means a state that the circuit board 1 to be inspected is compressed between, for example, the upper-side board-compressing member 30 and the lower-side board-compressing member 50, whereby the anisotropically conductive sheet is pressed in the thickness-wise direction thereof.
As the silicone rubber, is preferred that obtained by crosslinking or condensing liquid silicone rubber. The liquid silicone rubber preferably has a viscosity not higher than 105 poises as measured at a shear rate of 101 sec and may be any of condensation type, addition type and those containing a vinyl group or hydroxyl group. As specific examples thereof, may be mentioned dimethyl silicone raw rubber, methylvinyl silicone raw rubber and methylphenylvinyl silicone raw rubber.
Liquid silicone rubber having vinyl groups at both terminals thereof is obtained by subjecting a cyclic siloxane such as octamethylcyclotetrasiloxane to anionic polymerization in the presence of a catalyst, using, for example, dimethyldivinylsiloxane 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.
A flowable sheet-forming material is prepared by dispersing conductive particles in a polymeric substance-forming material, which will become an elastic polymeric substance by a curing treatment, and conducting a defoaming treatment by pressure reduction as needed. This sheet-forming material prepared in such a manner is poured into a molding cavity of a mold for molding of an anisotropically conductive sheet to form a sheet-forming material layer in a state that the conductive particles have been dispersed. For example, a pair of electromagnets are then arranged on an upper surface and a lower surface of the mold, and the electromagnets are operated, thereby applying a parallel magnetic field to the sheet-forming material layer in its thickness-wise direction to orient the conductive particles dispersed in the sheet-forming material layer so as to align in the thickness-wise direction. In this state, the sheet-forming material layer is subjected to a curing treatment, thereby producing an anisotropically conductive sheet with the conductive particles oriented in the elastic polymeric substance so as to align in the thickness-wise direction.
The uneven distribution type anisotropically conductive sheets making up the first inspection apparatus 10 can be produced in the following manner. For example, a mold for molding of anisotropically conductive sheet, which is composed of a top force and a bottom force each having a form of a substantially flat plate as a whole and corresponding to each other, and has the construction that a material layer filled into a molding cavity between the top force and the bottom force can be cured by heating while applying a magnetic field to the material layer, is provided.
The first inspection apparatus 10 is so constructed that in such a measurable state, a gap (hereinafter also referred to as �gap between upper-side and low-side supports�) in the thickness-wise direction of the complex stack 19 between a tip level (hereinafter also referred to as �upper-side level�) in the upper-side support 22 and a tip level (hereinafter also referred to as �lower-side level�) in the lower-side support 26 is smaller than the total thickness of the complex stack 19, the upper-side base plate 21 and the lower-side base plate 25.
In the above, �the thickness of the complex stack 19� means the total thickness of the upper-side board-compressing member 30, the circuit board 1 to be inspected and the lower-side board-compressing member 50.
In the above, �the gap between upper-side and lower-side supports� means a clearance between a boundary surface (hereinafter also referred to as �upper-side boundary surface�) M2 between the upper-side support 22 and the upper-side base plate 21 located on the upper-side level and a boundary surface (hereinafter also referred to as �lower-side boundary surface�) M3 between the lower-side support 26 and the lower-side base plate 25 located on the lower-side level in a direction perpendicular to the thickness-wise direction of the complex stack 19 when the upper-side boundary surface M2 is located above the lower-side boundary surface M3 in FIG. 12. Accordingly, in this description, the case where the positional relation between the upper-side boundary surface M2 and the lower-side boundary surface M3 is reversed is regarded as a state that there is no gap between upper-side and lower-side supports.
According to the above-described first inspection apparatus 10, in the measurable state, points of application of the pressing force by the upper-side supports 22 and points of application of the pressing force by the lower-side supports 26 are formed in the form of a lattice at positions different from one another on the specific plane M1 of projection, and the complex stack 19, in which the circuit board 1 to be inspected is compressed, is, as it were, forcedly deformed together with the upper-side base plate 21 and lower-side base plate 25 in accordance with the upper-side supporting points 21A and lower-side supporting points 25B forming the points of application so as to form a regular wave shape, thereby inhibiting the pressing force from concentrating on the points of application. As a result, since the pressure distribution in the circuit board 1 to be inspected is uniformed, a state that all the electrodes (upper-side electrodes 2 to be inspected and lower-side electrodes 3 to be inspected) to be inspected in the circuit board 1 to be inspected have been evenly electrically connected to their corresponding electrodes for current supply and electrodes for voltage measurement can be attained, so that the electric resistance of the circuit board can be measured with high accuracy.
This inspection apparatus (hereinafter also referred to as �second inspection apparatus�) is used for conducting electrical inspection of a circuit board, on both surfaces of which inspection object electrodes (electrodes to be inspected) have been formed. In this inspection apparatus, an upper-side board-compressing member 60 arranged on an upper side of an inspection object circuit board (circuit board to be inspected) 1 and having a plurality of inspection electrodes 62A formed in accordance with a pattern corresponding to upper-side electrodes 2 to be inspected of the circuit board 1 to be inspected and provided with an anisotropically conductive sheet 33 on its front surface (lower surface in FIG. 13) and, a lower-side board-compressing member 65 arranged on a lower side of the circuit board 1 to be inspected and having a plurality of inspection electrodes 67A formed in accordance with a pattern corresponding to lower-side electrodes 3 to be inspected of the circuit board 1 to be inspected and provided with an anisotropically conductive sheet 53 on its front surface (upper surface in FIG. 13) are arranged so as to be vertically opposed to each other.
Example 1 An inspection apparatus (hereinafter also referred to as �Inspection Apparatus (1)�) for circuit board of the following conditions, which is adapted to an inspection section of a rail-carried type automatic circuit board inspection machine �STARREC V5� (manufactured by NIDEC-READ CORPORATION) was produced in accordance with the construction shown in FIG. 1.
(1) Upper-Side Adaptor: [Circuit Board for Inspection]
Conductive particles: material: nickel particles plated with gold, average particle diameter: 20 μm, content: 18% by volume Elastic polymeric substance: Material: silicone rubber, hardness: 40 Electric resistance in thickness-wise direction in measurable state: 0.1 Ω Ratio of electric resistance value in thickness-wise direction to electric resistance value in plane direction: 1,000 or higher (2) Upper-Side Inspection Head: [Inspection Pin]
Material: glass fiber-reinforced epoxy resin material �FR-4� Dimensions: 200 mm by 346 mm by 1.9 mm in thickness (3) Upper-Side Base Plate:
Material: glass fiber-reinforced epoxy resin material �FR-4� Dimensions: 200 mm by 346 mm by 4.0 mm in thickness Mass: 0.5 kg (4) Upper-Side Support:
Material: brass Dimensions: outer diameter of tip part: 4 mm, overall length: 67 mm Clearance between adjacent upper-side supports: Lateral direction in FIG. 1 (hereinafter also referred to as �lateral direction� merely): 32.25 mm, Direction (hereinafter also referred to as �vertical direction� merely) perpendicular to lateral direction: 24.75 mm (5) Lower-Side Adaptor [Circuit Board for Inspection]
Dimensions of electrodes for current supply: 0.06 mm by 0.15 mm
Dimensions of electrodes for voltage measurement: 0.06mm by 0.15 mm Clearance between electrode for current supply and electrode for voltage measurement: 90 μm Dimensions of terminal electrodes: 0.4 mm in diameter Material of base material: glass fiber-reinforced epoxy resin Maximum thickness: 1.0 mm [Anisotropically Conductive Sheet]
Dimensions: 100 mm by 110 mm by 0.1 mm in thickness Conductive particles: material: nickel particles plated with gold, average particle diameter: 20 μm, content: 18% by volume Elastic polymeric substance: material: silicone rubber, hardness: 40 Electric resistance in thickness-wise direction in measurable state: 0.1Ω Ratio of electric resistance value in thickness-wise direction to electric resistance value in plane direction: 1,000 or higher (6) Lower-Side Inspection Head: [Inspection Pin]
Material: glass fiber-reinforced epoxy resin material �FR-4� Dimensions: 100 mm by 338 mm by 1.9 mm in thickness [Alignment Movable Plate]
Dimensions: 100 mm by 338 mm by 2.95 mm in thickness (7) Lower-Side Base Plate:
Material: glass fiber-reinforced epoxy resin material �FR-4� Dimensions: 100 mm by 338 mm by 6.0 mm in thickness Projected height of projected part: 3.0 mm Mass: 0.4 kg (8) Lower-Side Support:
Material: brass Dimensions: outer diameter of tip part: 4 mm, overall length: 65 mm Clearance between adjacent lower-side supports: Lateral direction: 32.25 mm, Vertical direction: 24.75 mm (9) Upper-Side Supporting Points and Lower-Side Supporting Points:
Clearance between adjacent upper-side supporting points: Lateral direction: 32.25 mm, Vertical direction: 24.75 mm Length (clearance c in FIG. 4) of diagonal line in upper-side unit region: about 41 mm Clearance between adjacent lower-side supporting points: Lateral direction: 32.25 mm, Vertical direction: 24.75 mm Length of diagonal line in lower-side unit region: about 41 mm Clearance (d in FIG. 4) between lower-side supporting point and upper-side supporting point located within upper-side unit region: about 20 mm In Inspection Apparatus (1), a non-defective circuit board having the following specification was used as a circuit board to be inspected to conduct performance tests (measurement of minimum pressing pressure and determination of durability of anisotropically conductive sheets) in accordance with the following respective methods. The measured results of the minimum pressing pressure are shown in Table 1, and the determined results of the durability of anisotropically conductive sheets are shown in Table 2.
The Inspection Apparatus (1) produced was installed in an inspection section of a rail-carried type automatic circuit board inspection machine �STARREC V5�, and the non-defective circuit board provided was then set in Inspection Apparatus (1). The pressing pressure of the rail-carried type automatic circuit board inspection machine �STARREC V5� was changed stepwise within a range of 100 to 250 kgf, and a conduction resistance value as to the electrodes to be inspected of the non-defective circuit board when a current of 1 mA was applied to the electrode for current supply in each pair of inspection electrodes was measured by the electrode for voltage measurement for 10 times every pressing pressure conditions.
An inspection point (hereinafter referred to as �NG inspection point�) at which the conduction resistance value measured reached 100Ω or higher was judged to be defective conduction to calculate out a proportion (hereinafter referred to as �proportion of NG inspection points�) of the number of the NG inspection points to the total number of inspection points. The lowest pressing pressure under which the proportion of NG inspection points was 0.01% or lower was regarded as a minimum pressing pressure.
Since the number of the upper-side electrodes to be inspected in the non-defective circuit board is 7,312, the number of the lower-side electrodes to be inspected is 3,784, and the measurement is conducted 10 times every pressing pressure conditions, �the proportion of NG inspection points� specifically indicates a proportion of the NG inspection points to the inspection points of 110,960 calculated out by an equation (7,312+3,784)�10=110,960 (the same shall apply hereinafter).
The Inspection Apparatus (1) produced was installed in an inspection section of a rail-carried type automatic circuit board inspection machine �STARREC V5�, and the non-defective circuit board provided was then set in Inspection Apparatus (1). After pressurization was conducted prescribed times against the non-defective circuit board under conditions of a pressing pressure of 130 kgf by the rail-carried type automatic circuit board inspection machine �STARREC V5�, a conduction resistance value as to electrodes to be inspected of the non-defective circuit board when a current of 1 mA was applied to the electrode for current supply in each pair of inspection electrodes was measured 10 times in total by the electrode for voltage measurement under conditions of a pressing pressure of 130 kgf. An inspection point (NG inspection point) at which the conduction resistance value measured reached 100 Ω or higher was judged to be defective conduction to calculate out a proportion (proportion of NG inspection points) of the number of the NG inspection points to the total number of inspection points.
Comparative Example 1 An inspection apparatus (hereinafter also referred to as �Comparative Inspection Apparatus (1)�) for circuit board having the same construction as Inspection Apparatus (1) except that the thickness of the upper-side base plate was set to 10.0 mm, the thickness of the lower-side base plate was set to 13.0 mm, the outer diameter of the tip part of each of the upper-side supports and lower-side supports was set to 6.0 mm, the clearances in the lateral direction between upper-side supports and between lower-side supports were each set to 32.25 mm, the clearances in the vertical direction were each set to 24.75 mm, and the upper-side supporting points and lower-side supporting points were arranged in the following manner was produced.
Proportion of NG Inspection Points (%)
Example 2 An inspection apparatus (hereinafter also referred to as �Inspection Apparatus (2)�) for circuit board of the following conditions, which is adapted to an inspection section of a rail-carried type automatic circuit board inspection machine �STARREC V5� (manufactured by NIDEC-READ CORPORATION) was produced in accordance with the construction shown in FIG. 13.
Dimensions: 110 mm by 110 mm by 0.1 mm in thickness Conductive particles: material: nickel particles plated with gold, average particle diameter: 20 μm, content: 18% by volume Elastic polymeric substance: material: silicone rubber, hardness: 40 (2) Upper-Side Inspection Head:
Material: brass Dimensions: outer diameter of tip part: 4 mm, overall length: 67 mm Clearance between adjacent upper-side supports: lateral direction: 32.25 mm vertical direction: 24.75 mm (5) Lower-Side Adaptor
Dimensions: 100 mm by 110 mm by 0.1 mm in thickness Conductive particles: material: nickel particles plated with gold, average particle diameter: 20 μm, content: 18% by volume Elastic polymeric substance: material: silicone rubber, hardness: 40 (6) Lower-Side Inspection Head:
Clearance between adjacent upper-side supporting points: Lateral direction: 32.25 mm, Vertical direction: 24.75 mm Length of diagonal line in upper-side unit region: about 41 mm Clearance between adjacent lower-side supporting points: Lateral direction: 32.25 mm, Vertical direction: 24.75 mm Length of diagonal line in lower-side unit region: about 41 mm Clearance between lower-side supporting point and upper-side supporting point located within upper-side unit region: about 20 mm In Inspection Apparatus (2), the non-defective circuit board used in Example 1 was used as a circuit board to be inspected to conduct a performance test in the same manner as in the measurement of the minimum pressing pressure in Example 1 except that the conduction resistance value when a current of 1 mA was applied to an inspection electrode in the measurement of the minimum pressing pressure in Example 1 was measured in the inspection electrode, and to conduct another performance test in the same manner as in the determination of the durability of the anisotropically conductive sheets in Example 1 except that the conduction resistance value when a current of 1 mA was applied to an inspection electrode in the determination of the durability of the anisotropically conductive sheets in Example 1 was measured in the inspection electrode, the pressing pressure conditions of 130 kgf was changed to 150 kgf, and the pressing pressure conditions of 150 kgf was changed to 180 kgf. The measured results of the minimum pressing pressure are shown in Table 3, and the determined results of the durability of anisotropically conductive sheets are shown in Table 4.
Comparative Example 2 An inspection apparatus (hereinafter also referred to as �Comparative Inspection Apparatus (2)�) for circuit board having the same construction as Inspection Apparatus (2) except that the thickness of the upper-side base plate was set to 10.0 mm, the thickness of the lower-side base plate was set to 13.0 mm, the outer diameter of the tip part of each of the upper-side supports and lower-side supports was set to 6.0 mm, the clearances in the lateral direction between upper-side supports and between lower-side supports were each set to 32.25 mm, and the clearances in the vertical direction were each set to 24.75 mm was produced.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS4968931Nov 3, 1989Nov 6, 1990Motorola, Inc.Apparatus and method for burning in integrated circuit wafersUS5477160Aug 6, 1993Dec 19, 1995Fujitsu LimitedModule test cardUS6297652 *Feb 22, 2000Oct 2, 2001Jsr CorporationElectric resistance measuring apparatus and method for circuit boardUS6720787 *Sep 24, 2001Apr 13, 2004Jsr CorporationAnisotropically conductive sheet, production process thereof and applied product thereofJP2000074965A Title not availableJP2001148260A Title not availableJPH05341007A Title not availableJPH07105741A Title not availableJPS59214235A Title not available* Cited by examinerClassifications U.S. Classification324/754.11, 324/763.01International ClassificationG01R31/26, G01R31/02, G01R1/073, G01R31/28, H05K3/00Cooperative ClassificationG01R31/2808, G01R1/07335European ClassificationG01R1/073B2C2Legal EventsDateCodeEventDescriptionNov 22, 2012FPAYFee paymentYear of fee payment: 4RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google