Patent Publication Number: US-2021195757-A1

Title: Producing method of wiring circuit board and wiring circuit board sheet

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     The present application claims priority from Japanese Patent Application No. 2019-232710 filed on Dec. 24, 2019, the contents of which are hereby incorporated by reference into this application. 
     TECHNICAL FIELD 
     The present invention relates to a method for producing a wiring circuit board, and a wiring circuit board sheet. 
     BACKGROUND ART 
     Conventionally, a method for producing a flexible substrate for forming a wiring pattern in an insulating layer by a pattern forming method of an additive method or a subtractive method has been known. 
     For example, as a method for forming the wiring pattern by the subtractive method, a method in which an exposure mask having an opening portion of an equal length of a width of both end portions is provided on a photosensitive resist layer disposed on the surface of a metal layer so as to sequentially overlap end portions of the opening portion in a longitudinal direction, and the resist layer is repeatedly exposed has been proposed (ref. for example, Patent Document 1 below). 
     In Patent Document 1, by development after exposure, a resist pattern having a linear shape of the same width over the longitudinal direction is formed, and then, by etching the metal layer exposed from the resist pattern, a wiring pattern having a linear shape of the same width over the longitudinal direction is formed. 
     Prior Art Document 
     Patent Document 
     [Patent Document 1] Japanese Unexamined Patent Publication No. 2005-286207 
     SUMMARY OF THE INVENTION 
     Problems to be Solved by the Invention 
     However, when the exposure mask is moved in the longitudinal direction, the end portions of the opening portion in the exposure mask may deviate in a width direction. In this case, there is a request to measure an amount of deviation and adjust the arrangement of the mask based on the measured amount. 
     According to the method described in Patent Document 1, even when the shape caused by the above-described deviation in the wiring pattern that is finally formed can be observed, there is a problem that the above-described deviation of the mask cannot be measured. More specifically, a portion of the resist layer facing the exposure mask includes a portion exposed once and a portion exposed twice, and these portions cannot be distinguished by observing the shape of the wiring pattern described above. Therefore, the amount of deviation of the exposure mask cannot be accurately measured. Therefore, the arrangement of the exposure mask cannot be adjusted. 
     Furthermore, there is also a demand to accurately measure the deviation of the wiring pattern caused by the above-described deviation of the mask. 
     The present invention provides a wiring circuit board which can accurately measure an amount of deviation of a mask, can correct the arrangement of the mask, and can further measure the deviation of a wiring pattern, and a method for producing a wiring circuit board. 
     Solution to the Problems 
     The present invention (1) includes a method for producing a wiring circuit board including the steps of forming an elongated insulating layer, and forming a conductive layer elongated along the insulating layer find adjacent to the insulating layer in a thickness direction perpendicular to a longitudinal direction, wherein the conductive layer has an intermediate portion located between one end portion and the other end portion in the longitudinal direction, in the step of forming the conductive layer, an elongated photoresist is placed along the insulating layer on one side in the thickness direction of the insulating layer, the photoresist is exposed a plurality of times while a mask is sequentially arranged in the longitudinal direction, the photoresist is developed after exposure, a resist corresponding to the conductive layer is formed, and plating or etching is carried out using the resist, the mask has at least a pattern corresponding to the intermediate portion of the conductive layer, in the step of exposing the photoresist, in the photoresist, a portion facing the longitudinal other end portion of the mask at the time of the n-th time (n is a natural number) exposure is overlapped with a portion facing the longitudinal one end portion of the mask at the time of the [n+1]th time exposure, the longitudinal other end portion of the n-th time mask includes the pattern and a first mark, the longitudinal one end portion of the [n+1]th time mask includes the pattern and a second mark, and in the step of forming the conductive layer, one conductive mark portion is formed by the n-th time exposure of the photoresist through the first mark, formation of the resist by development of the photoresist after exposure, and plating or etching using the resist and another conductive mark portion adjacent to the one conductive mark portion when projected in the longitudinal direction is formed by the [n+1]th time exposure of the photoresist through the second mark, formation of the resist by development of the photoresist after exposure, and plating or etching using the resist. 
     In this method, a distance between the one conductive mark portion and the other conductive mark portion is measured, and tins distance is evaluated based on a distance between the first mark and the second mark in a projected surface when projected in the longitudinal direction in the mask, so that an amount of deviation between the longitudinal other end portion of the n-th time mask and the longitudinal one end portion of the [n+1]th time mask can be measured. 
     Therefore, it is possible to adjust the arrangement of the mask when the same step is carried out thereafter. 
     Furthermore, since it is possible to measure the amount of deviation of the mask described above, an amount of deviation between the longitudinal other end portion of the intermediate portion corresponding to the pattern of the n-th time mask and the longitudinal one end portion of the intermediate portion corresponding to the pattern of the [n+1]th time mask can be accurately measured. Therefore, the defectiveness of the conductive layer can be accurately determined. 
     The present invention (2) includes the method for producing a wiring circuit board described in (1), wherein one of the one conductive mark portion and the other conductive mark portion includes one portion and the other portion which are arranged to be opposed to each other at a distance in a direction perpendicular to the longitudinal direction and the thickness direction, and the other includes a middle portion which is arranged between one portion and the other portion and is separated from one portion and the other portion. 
     In this method, by measuring a distance between the middle portion and one portion, and a distance between the middle portion and the other portion, the amount of deviation between the longitudinal other end portion of the n-th time mask and the longitudinal one end portion of the [n+1]th time mask can be further accurately measured. 
     Therefore, it is possible to accurately adjust the arrangement of the mask when the same step is carried out thereafter. 
     Furthermore, the amount of deviation between the longitudinal other end portion of the intermediate portion corresponding to the pattern of the n-th time mask and the longitudinal one end portion of the intermediate portion corresponding to the pattern of the [n+1]th time mask can be further accurately measured. Therefore, the defectiveness of the conductive layer can be further accurately determined. 
     The present invention (3) includes the method for producing a wiring circuit board described in (1) or (2), wherein a plurality of measurement mark portions including the one conductive mark portion and the other conductive mark portion are arranged at intervals from each other in a direction perpendicular to the longitudinal direction and the thickness direction. 
     In this method, the plurality of measurement mark portions are arranged at intervals from each other in the perpendicular direction, it is possible to measure an amount of rotation when the [n+1]th time mask is rotated with respect to the n-th time mask. 
     The present invention (4) includes a method for producing a wiring circuit board including the steps of forming an elongated insulating layer, and forming a conductive layer elongated along the insulating layer and adjacent to the insulating layer in a thickness direction perpendicular to a longitudinal direction, wherein the insulating layer has an intermediate portion located between one end portion and the other end portion in the longitudinal direction, in the step of forming the insulating layer, an elongated photosensitive resin insulating layer is placed, the photosensitive resin insulating layer is exposed a plurality of times while a mask is sequentially arranged in the longitudinal direction, and the photosensitive resin insulating layer is developed after exposure, the mask has at least a pattern corresponding to the intermediate portion of the insulating layer, in the step of exposing the photosensitive resin insulating layer, in the photosensitive resin insulating layer, a portion facing the longitudinal other end portion of the mask at the time of the n-th time (n is a natural number) exposure is overlapped with a portion facing the longitudinal one end portion of the mask at the time of the [n+1]th time exposure, the longitudinal other end portion of the n-th time mask includes the pattern and a third mark, the longitudinal one end portion of the [n+1]th time mask includes the pattern and a fourth mark, and in the step of forming the insulating layer, one insulating mark portion is formed by the n-th time exposure of the photosensitive resin insulating layer through the third mark and development of the photosensitive resin insulating laser after exposure and another insulating mark portion adjacent to the one insulating mark portion when projected in the longitudinal direction is formed by the [n+1]th time exposure of the photosensitive resin insulating layer through the fourth mark and development of the photosensitive resin insulating layer after exposure. 
     In this method, a distance between the first insulating mark and the second insulating mark is measured, and this distance is evaluated based on a distance between the third mark and the fourth mark in a projected surface when projected in the longitudinal direction in the mask, so that an amount of deviation between the longitudinal other end portion of the n-th time mask and the longitudinal one end portion of the [n+1]th time mask can be measured. 
     Therefore, it is possible to adjust the arrangement of the mask when the same step is carried out thereafter. 
     Furthermore, live amount of deviation between the longitudinal other end portion of the intermediate portion corresponding to the pattern of the n-th time mask and the longitudinal one end portion of the intermediate portion corresponding to the pattern of the [n+1]th time mask can be accurately measured. Therefore, the defectiveness of the insulating layer can be accurately determined. 
     The present invention (5) includes a wiring circuit board sheet including an elongated support sheet, a base insulating layer extending in a longitudinal direction of the support sheet and disposed on one surface in a thickness direction of the support sheet, a conductive layer extending in the longitudinal direction and disposed on one surface in the thickness direction of the base insulating layer, and a plurality of areas partitioned in order in the longitudinal direction, wherein the conductive layer has an intermediate portion located between one end portion and the other end portion in the longitudinal direction, and a first measurement mark portion disposed at a boundary portion of the areas adjacent to each other in the longitudinal direction, configured to measure an amount of deviation of the intermediate portion at the boundary portion in a direction perpendicular to the thickness direction and the longitudinal direction, and independent from the conductive layer is included. 
     Since the wiring circuit board includes the first measurement mark portion, it is possible to measure the amount of deviation of the intermediate portion of the conductive layer and determine the defectiveness of the conductive layer. Therefore, the conductive layer of the wiring circuit board is excellent in reliability. 
     The present invention (6) includes the wiring circuit board sheet described in (5), wherein the base insulating layer has a second intermediate portion located between one end portion and the other end portion in the longitudinal direction, and a second measurement mark portion configured to measure an amount of deviation of the second intermediate portion at the boundary portion in the perpendicular direction and independent from the base insulating layer is included. 
     Since the wiring circuit board includes the second measurement mark portion, it is possible to measure the amount of deviation of the intermediate portion of the insulating layer and determine the defectiveness of the insulating layer. Therefore, the insulating layer of the wiring circuit board is excellent in reliability. 
     The present invention (7) includes the wiring circuit board sheet described in (6), wherein the first measurement mark portion and the second measurement mark portion overlap. 
     In the wiring circuit board, the configuration of the measurement mark portion becomes compact. Further, of the first measurement mark portion and the second measurement mark portion, when one is detected, the other can be easily detected. 
     Effect of the Invention 
     The method for producing a wiring circuit board of the present invention can accurately measure an amount of deviation of a mask, correct the arrangement of the mask, and further, measure the deviation of a wiring pattern. 
     In the wiring circuit board sheet of the present invention, it is possible to measure an amount of deviation of an intermediate portion of a conductive layer. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  shows a plan view of a wiring circuit board sheet of the present invention. 
         FIG. 2  shows a side cross-sectional view along an X-X of the wiring circuit board sheet shown in  FIG. 1 . 
         FIG. 3  shows a front cross-sectional view along a Y-Y of the wiring circuit board sheet shown in  FIG. 1 . 
         FIG. 4  shows an enlarged plan view of a measurement mark portion provided in the wiring circuit board sheet shown in  FIG. 1 . 
         FIGS. 5A to 5C  show process views of a method for producing the wiring circuit board sheet shown in  FIG. 1 . 
         FIG. 5A  illustrating a step of forming a base insulating layer, 
         FIG. 5B  illustrating a step of forming a conductive pattern, and 
         FIG. 5C  illustrating a step of forming a cover insulating layer. 
         FIGS 6A to 6B  show process views of a method for producing the wiring circuit board sheet shown in  FIG. 2 . 
         FIG. 6A  illustrating a step of forming a base insulating layer and 
         FIG. 6B  illustrating a step of forming a conductive pattern. 
         FIGS 7A to 7B  show process views of a method for producing the wiring circuit board sheet shown in  FIG. 3 ; 
         FIG. 7A  illustrating a step of forming a base insulating layer and an insulating measurement mark portion and 
         FIG. 7B  illustrating a step of forming a conductive pattern and a conductive measurement mark portion. 
         FIGS. 8A to 8C  show process views illustrating a step of exposing a photosensitive base precursor layer while moving a mask: 
         FIG. 8A  illustrating a step of disposing a first mask, 
         FIG. 8B  illustrating a step of disposing a second mask, and 
         FIG. 8C  illustrating a step of disposing a third mask. 
         FIGS. 9A to 9C  show a step of exposing a photosensitive base precursor layer through a mask, and show process cross-sectional views along a Z-Z line of  FIGS. 8A to 8C ; 
         FIG. 9A  illustrating a step of exposing the photosensitive base precursor layer through a first mask, 
         FIG. 9B  illustrating a step of exposing the photosensitive base precursor layer through a second mask, and 
         FIG. 9C  illustrating a step of developing the photosensitive base precursor layer to form an insulating measurement mark portion. 
         FIGS. 10A to 10C  show process views illustrating a step of exposing a photoresist while moving a mask; 
         FIG. 10A  illustrating a step of disposing a fourth mask, 
         FIG. 10B  illustrating a step of disposing a fifth mask, and 
         FIG. 10C  illustrating a step of disposing a sixth mask. 
         FIGS. 11A to 11D  show a step of exposing a photoresist through a mask, and show process cross-sectional views along a Z-Z line of  FIGS. 10A to 10C : 
         FIG. 11A  illustrating a step of exposing the photoresist through a fourth mask, 
         FIG. 11B  illustrating a step of exposing the photoresist through a fifth mask, 
         FIG. 11C  illustrating a step of developing the photoresist to form a plating resist, and 
         FIG. 11D  illustrating a step of forming a conductive measurement mark portion by plating using the plating resist. 
         FIG. 12A  shows a plan view of an embodiment in which a first light transmitting pattern of a first mask and a second mask deviates. 
         FIG. 12B  shows a plan view of an insulating measurement mark portion and a base insulating layer corresponding to  FIG 12A . 
         FIG. 13A  shows a plan view of an embodiment in which a fourth light shielding pattern of a fourth mask and a fifth mask deviates. 
         FIG. 13B  shows a plan view of a conductive measurement mark portion and a conductive pattern corresponding to  FIG. 13A . 
         FIGS. 14A to 14D  show a modified example of the production step shown in  FIGS. 11A to 11D , and show an embodiment of forming a conductive pattern and a conductive measurement mark portion by etching: 
         FIG. 14A  illustrating a step of exposing the photoresist through the fourth mask, 
         FIG. 14B  illustrating a step of exposing the photoresist through the fifth mask, 
         FIG. 14C  illustrating a step of developing the photoresist to form an etching resist, and 
         FIG. 14D  illustrating a step of forming a conductive measurement mark portion and a conductive pattern by etching using the etching resist. 
         FIGS. 15A to 15C  show a modified example of moving the same mask: 
         FIG. 15A  illustrating a step of disposing a fifth mask, 
         FIG. 15B  illustrating a step of moving the fifth mask, and 
         FIG. 15C  illustrating an embodiment for forming three measurement mark portions in each of both end portions in a width direction of a wiring circuit board sheet. 
         FIG. 16  shows a plan view of a wiring circuit board assembly sheet which is a modified example of a wiring circuit board sheet including a plurality of wiring circuit boards. 
         FIGS. 17A to 17C  show a modified example in which a light shielding mark is spaced apart from the end edge in a longitudinal direction of a mask: 
         FIG. 17A  illustrating a step of disposing a fourth mask, 
         FIG. 17B  illustrating a step of disposing a fifth mask, and 
         FIG. 17C  illustrating a step of producing a wiring circuit board sheet. 
         FIGS. 18A to 18C  show a modified example in which a conductive measurement mark portion includes only a first conductive mark: 
         FIG. 18A  illustrating a step of disposing a fourth mask, 
         FIG. 18B  illustrating a step of disposing a fifth mask, and 
         FIG. 18C  illustrating a step of producing a wiring circuit board sheet. 
         FIGS. 19A to 19C  show a modified example of having two third conductive marks: 
         FIG. 19A  illustrating a step of disposing a fourth mask, 
         FIG. 19B  illustrating a step of disposing a fifth mask, and 
         FIG. 19C  illustrating a step of producing a wiring circuit board sheet. 
         FIGS. 20A to 20C  show a modified example in which a conductive measurement mark portion has a double rectangular frame shape: 
         FIG. 20A  illustrating a step of disposing a fourth mask, 
         FIG. 20B  illustrating a step of disposing a fifth mask, and 
         FIG. 20C  illustrating a step of producing a wiring circuit board sheet. 
         FIGS. 21A to 21C  show a modified example in which a conductive measurement mark portion hits a double circular ring shape: 
         FIG. 21A  illustrating a step of disposing a fourth mask, 
         FIG. 21B  illustrating a step of disposing a fifth mask, and 
         FIG. 21C  illustrating a step of producing a wiring circuit board sheet. 
         FIGS. 22A to 22C  show a modified example in which a conductive measurement mark portion includes two U-shaped portions: 
         FIG. 22A  illustrating a step of disposing a fourth mask, 
         FIG. 22B  illustrating a step of disposing a fifth mask, and 
         FIG. 22C  illustrating a step of producing a wiring circuit board sheet. 
         FIGS. 23A to 23D  show a modified example in which the same mask is moved from one side to the other side in a longitudinal direction: 
         FIG. 23A  illustrating a step of disposing a mask in one end portion in the longitudinal direction of a photoresist, 
         FIG. 23B  illustrating a step of moving the same mask, 
         FIG. 23C  illustrating a step of moving the same mask, and 
         FIG. 23D  illustrating a plan view of a wiring circuit board sheet including a linear conductive pattern. 
     
    
    
     EMBODIMENT OF THE INVENTION 
     One Embodiment 
     One embodiment of a wiring circuit board sheet and a method for producing a wiring circuit board of the present invention is described with reference to  FIGS. 1 to 13B . 
     In  FIG 1 . in order to clearly show the shape of a conductive pattern  5  and a base insulating layer  9  (described later), a cover insulating layer  10  (described later) is omitted. Further, in  FIGS. 13A to 13B , in order to clearly show the arrangement of the conductive pattern  5  and a conductive measurement mark portion  18  (described later), the base insulating layer  9  is omitted. 
     As shown in  FIGS. 1 to 3 , a wiring circuit board sheet  1  has a predetermined thickness, and is a generally rectangular sheet when viewed from the top extending along a longitudinal direction (direction perpendicular to a thickness direction). The wiring circuit board sheet  1  includes one support sheet  2 , one wiring circuit board  3 , and a plurality of measurement mark portions  4 . 
     The support sheet  2  has the same shape as the wiring circuit board sheet  1  when viewed front the top. The support sheet  2  is not particularly limited as long as it can support (secure) the wiring circuit board  3  from the other side in the thickness direction. An example of the support sheet  2  includes a sheet having toughness, flexibility, and/or rigidity. Examples of the support sheet  2  include a metal plate, a resin sheet, and paper. An example of the metal plate includes a stainless steel plate. An example of the resin sheet includes a polyimide sheet. Further, the support sheet  2  is a single layer or a multilayer (laminate). A thickness of the support sheet  2  is not particularly limited. The thickness of the support sheet  2  is, for example, 5 μm or more, preferably 10 μm or more, and for example, 500 μm or less, preferably 200 μm or less. 
     The wiring circuit board  3  is disposed in the inner-side portion of the circumferential end portion in a plane direction (direction perpendicular to the thickness direction) in one surface in the thickness direction of the support sheet  2 . The wiring circuit board  3  has a generally rectangular flat plate shape extending along the longitudinal direction. 
     The wiring circuit board  3  includes the conductive pattern  5 . The conductive pattern  5  is disposed over the longitudinal direction in the wiring circuit board  3 . The conductive pattern  5  extends in the longitudinal direction. The conductive pattern  5  includes a conductive one end portion  6 , a conductive other end portion  7 , and a conductive intermediate portion  8  as one example of an intermediate portion. 
     The conductive one end portion  6  is located in one end portion in the longitudinal direction of the conductive pattern  5 . The conductive one end portion  6  includes, for example, a one-side terminal. In the wiring circuit board  3 , the plurality of one-side terminals are arranged to be adjacent to each other at a distance in the longitudinal direction and a width direction (one example of a direction perpendicular to the longitudinal direction and the thickness direction). Each of the plurality of one-side terminals has, for example, a generally rectangular land shape. 
     The conductive other end portion  7  is located in the other end portion in the longitudinal direction of the conductive pattern  5 . The conductive other end portion  7  includes, for example, an other-side terminal. In the wiring circuit board  3 , the plurality of other-side terminals are arranged to be adjacent to each other at a distance in the longitudinal direction and the width direction. Each of the plurality of other-side terminals has, for example, a generally rectangular land shape. 
     The conductive intermediate portion  8  is located in the intermediate portion in the longitudinal direction of the conductive pattern  5 . The conductive intermediate portion  8  is located between the conductive one end portion  6  and the conductive other end portion  7 . The conductive intermediate portion  8  extends in the longitudinal direction. The conductive intermediate portion  8  includes a narrower wire than the one-side terminal and the other-side terminal. The wire is continuous to the one-side terminal and the other-side terminal. Thus, the wire connects the one-side terminal to the other-side terminal in the longitudinal direction. In the wiring circuit board  3 , the plurality of wires are arranged to be adjacent to each other at a distance in the width direction. The plurality of wires are parallel with each other. Each of the plurality of wires has a generally linear shape when viewed from the top along the longitudinal direction. 
     A length in the longitudinal direction of the conductive pattern  5  is, for example, 300 mm or more, preferably, 600 mm or more, more preferably, 1000 mm or more, and for example, 10,000 mm or less. The length in the longitudinal direction of the conductive pattern  5  is a distance between one end edge of the conductive one end portion  6  and the other end edge of the conductive other end portion  7 . When the length in the longitudinal direction of the conductive pattern  5  is the above-described lower limit or more, the wiring circuit board  3  is suitable as an elongated wiring circuit board in which a transmission distance of an electric signal and/or the transmission distance of a power supply current are/is long. 
     A width of the wire in the conductive pattern  5  is, for example, 100 μm or less, preferably 90 μm or less, more preferably 80 μm or less, and for example, 5 μm or more. An interval between the wires adjacent to each other is, for example, 100 μm or less, preferably 90 μm or less, more preferably 80 μm or less, and for example, 5 μm or more. When the width and/or the interval are/is the above-described upper limit or less, it is suitable as the narrow wiring circuit board  3 . 
     An example of a material for the conductive pattern  5  includes a conductor. An example of the conductor includes copper. A thickness of the conductive pattern  5  is, for example, 5 μm or more and 100 μm or less. 
     The wiring circuit board  3  further includes the base insulating layer  9  and the cover insulating layer  10  as one example of an insulating layer adjacent to the conductive pattern  5  on the other side and one side in the thickness direction, respectively. Specifically, the wiring circuit board  3  includes the base insulating layer  9 , the conductive pattern  5  described above which is disposed on one surface in the thickness direction of the base insulating layer  9 , and the cover insulating layer  10  disposed on one surface in the thickness direction of the base insulating layer  9  so as to expose the one-side terminal and the other-side terminal of the conductive pattern  5  and cover one surface in the thickness direction and both side surfaces in the plane direction of the wire of the conductive pattern  5 . 
     The base insulating layer  9  is disposed on one surface in the thickness direction of the support sheet  2 . The base insulating layer  9  has the same outer shape as the wiring circuit board  3 . 
     The base insulating layer  9  integrally includes a base one end portion  11  as one example of one end portion, a base other end portion  12  as one example of the other end portion, and a base intermediate portion  13  as one example of a second intermediate portion. The base one end portion  11  includes the conductive one end portion  6  when viewed from the top. The base other end portion  12  includes the conductive other end portion  7  when viewed from the top. The base intermediate portion  13  includes the conductive intermediate portion  8  when viewed from the top. 
     An example of a material for the base insulating layer  9  includes a resin having insulating properties. An example of the resin includes polyimide. A thickness of the base insulating layer  9  is, for example, 3 μm or more and 50 μm or less. 
     As shown in  FIGS. 2 and 5C , the cover insulating layer  10  includes a cover one end portion  14 , a cover other end portion  15 , and a cover intermediate portion  16 . The cover one end portion  14  is included in the base one end portion  11  when viewed from the top. The cover other end portion  15  is included in the base other end portion  12  when viewed from the top. The cover intermediate portion  16  is included in the base intermediate portion  13  when viewed from the top. An example of a material for the cover insulating layer  10  includes a resin having insulating properties. An example of the resin includes polyimide. A thickness of the cover insulating layer  10  is, for example, 3 μm or more and 50 μm or less. 
     As shown in  FIGS. 1 and 3 , the measurement mark portion  4  is disposed in both end portions in the width direction on one surface in the thickness direction of the support sheet  2 . 
     The plurality of (two) measurement mark portions  4  in one end portion in the width direction of the support sheet  2  are spaced apart from each other in the longitudinal direction. 
     The plurality of (two) measurement mark portions  4  in the other end portion in the width direction of the support sheet  2  are spaced apart from each other in the longitudinal direction. 
     In the wiring circuit board sheet  1 , the two measurement mark portions  4  which are oppositely disposed in the width direction define a boundary  20  of sheet areas  19  adjacent to each other in the longitudinal direction. The boundary  20  is a line segment passing through one measurement mark portion  4  and the other measurement mark portion  4 . The boundary  20  is along the width direction. In  FIGS. 1 and 5A to 5C , the boundary  20  is shown by a phantom line, and in the actual wiring circuit board sheet  1 , the outer shape of the boundary  20  may not be clearly visually recognized. 
     Further, a peripheral region including the boundary  20  is referred to as a boundary portion  21 . The measurement mark portion  4  is located in the boundary portion  21 . 
     Then, each (one) sheet area  19  is partitioned by the plurality of (two) boundaries  20  spaced apart in the longitudinal direction. The plurality of (three) sheet areas  19  are sequentially partitioned in the longitudinal direction. In the wiring circuit board sheet  1 , one wiring circuit board  3  is disposed over the plurality of (three) continuous sheet areas  19 . 
     As shown in  FIGS. 1 and 5C , for example, the three sheet areas  19  described above are referred to as a first sheet area  19 A, a second sheet area  19 B, and a third sheet area  19 C in order from one side toward the other side in the longitudinal direction. In this case, the conductive one end portion  6 , the base one end portion  11 , and the cover one end portion  14  are disposed in the first sheet area  19 A. The conductive other end portion  7 , the base other end portion  12 , and the cover other end portion  15  are disposed in the third sheet area  19 C. Meanwhile, the conductive intermediate portion  8 , the base intermediate portion  13 , and the cover intermediate portion  16  are disposed over the first sheet area  19 A to the third sheet area  19 C (all of the plurality of sheet areas  19 ). 
     As shown in  FIG. 4 , the measurement mark portion  4  includes an insulating measurement mark portion  17  as one example of a second measurement mark portion, and a conductive measurement mark portion  18  as one example of a first measurement mark portion. 
     The insulating measurement mark portion  17  is disposed at the outside in the width direction of the base insulating layer  9  at a distance. The insulating measurement mark portion  17  is independent from the base insulating layer  9 . 
     The insulating measurement mark portion  17  sequentially includes a first insulating mark  22  as one example of one portion, a third insulating mark  24  as one example of a middle portion, and a second insulating mark  23  as one example of the other portion from one side toward the other side in the width direction. The first insulating mark  22 , the third insulating mark  24 , and the second insulating mark  23  are spaced apart from each other in the width direction. The first insulating mark  22 , the third insulating mark  24 , and the second insulating mark  23  are overlapped with each other when projected in the width direction. 
     Thus, the first insulating mark  22  and the second insulating mark  23  are arranged to be opposed to each other at a distance in the width direction. The third insulating mark  24  is disposed between the first insulating mark  22  and the second insulating mark  23 . The third insulating mark  24  is spaced apart from the first insulating mark  22  and the second insulating mark  23 . 
     Each of the first insulating mark  22 , the third insulating mark  24 , and the second insulating mark  23  has a generally linear shape when viewed from the top along the longitudinal direction of the base insulating layer  9 . 
     The first insulating mark  22  and the second insulating mark  23  are one example of one insulating mark portion. The third insulating mark  24  is one example of another insulating mark portion. 
     The conductive measurement mark portion  18  is disposed at the outside in the width direction of the conductive pattern  5  at a distance. The conductive measurement mark portion  18  is electrically independent from the conductive pattern  5 . 
     The conductive measurement mark portion  18  sequentially includes a first conductive mark  25  as one example of one portion, a third conductive mark  27  as one example of a middle portion, and a second conductive mark  26  as one example of the other portion from one side toward the other side in the width direction. Each of the first conductive mark  25 , the third conductive mark  27 , and the second conductive mark  26  is included in each of the first insulating mark  22 , the third insulating mark  24 , and the second insulating mark  23 , respectively when viewed from the top. The first conductive mark  25  and the second conductive mark  26  are arranged to be opposed to each other at a distance in the width direction. The third conductive mark  27  is disposed between the first conductive mark  25  and the second conductive mark  26 . The third conductive mark  27  is spaced apart from the first conductive mark  25  and the second conductive mark  26 . 
     Specifically, the first conductive mark  25  is along the longitudinal direction of the conductive pattern  5 , and has a generally smaller linear shape than the first insulating mark  22  when viewed from the top. The length in the longitudinal direction of the first conductive mark  25  is shorter than that of the first insulating mark  22 . When projected in the width direction, the first conductive mark  25  is not overlapped with both end portions in the longitudinal direction of the first insulating mark  22 . 
     The third conductive mark  27  is parallel with the first conductive mark  25 , and has a generally smaller linear shape than the third insulating mark  24  when viewed from the top. The length in the longitudinal direction of the third conductive mark  27  is shorter than that of the third insulating mark  24 . When projected in the width direction, the third conductive mark  27  is not overlapped with both end portions in the longitudinal direction of the third insulating mark  24 . 
     The second conductive mark  26  is parallel with the first conductive mark  25 , and has a generally smaller linear shape than the second insulating mark  23  when viewed from the top. The length in the longitudinal direction of the second conductive mark  26  is shorter than that of the second insulating mark  23 . When projected in the width direction, the second conductive mark  26  is not overlapped with both end portions in the longitudinal direction of the second insulating mark  23 . 
     The first conductive mark  25  and the second conductive mark  26  are one example of one conductive mark portion. The third conductive mark  27  is one example of another conductive mark portion. 
     Next, a method for producing the wiring circuit hoard sheet  1  is described. 
     As shown in  FIGS. 2 to 3 and 6A to 7B , the method includes a first step of preparing the support sheet  2 , a second step of forming the base insulating layer  9  and the insulating measurement mark portion  17  (ref.  FIGS. 6A and 7A ), a third step of measuring an amount of deviation of masks  29 ,  30 , and  31  (ref:  FIGS. 4 and 12B ), a fourth step of forming the conductive pattern  5  and the conductive measurement mark portion  18  (ref.  FIGS. 6B and 7B ), a fifth step of measuring an amount of deviation of masks  39 ,  40 , and  41  (ref:  FIGS. 4 and 13B ), and a sixth step of forming the cover insulating layer  10  (ref.  FIGS. 2 to 3 ). In one embodiment, the first to the sixth steps are carried out in sequence. 
     First Step 
     In the first step, the elongated support sheet  2  is prepared. 
     Second step 
     As shown in  FIGS. 6A and 7A , subsequently, in the second step, the base insulating layer  9  and the insulating measurement mark portion  17  are formed by photolithography. 
     In the photolithography, first, as shown in  FIG. 9A , a photosensitive base precursor layer  28  as one example of a photosensitive resin insulating layer is disposed on the entire one surface in the thickness direction of the support sheet  2 . Specifically, a varnish of a photosensitive resin is applied to one surface in the thickness direction of the support sheet  2 , and then, dried to form the elongated photosensitive base precursor layer  28 . 
     Subsequently, as shown in  FIGS. 8A to 9C , the photosensitive base precursor layer  28  is exposed a plurality of times (three times) while the three masks  29 ,  30 , and  31  are sequentially arranged in the longitudinal direction, and the photosensitive base precursor layer  28  after exposure is developed. 
     As shown in  FIGS. 8A to 8C , the three masks  29 ,  30 , and  31  are the first mask  29 , the second mask  30 , and the third mask  31 , respectively. Each of the first mask  29 , the second mask  30 , and the third mask  31  has a generally rectangular outer shape when viewed from the top. 
     As shown in  FIGS. 8A and 9A , the first mask  29  includes a first light transmitting pattern  32 , a first light transmitting mark  33 , and a second light transmitting mark  34 . 
     The first light transmitting pattern  32  corresponds to the base one end portion  11  and the base intermediate portion  13  shown in  FIG. 5A . The longitudinal other end edge of the first light transmitting pattern  32  is included in the longitudinal other end edge of the first mask  29 . The first light transmitting pattern  32  extends from the longitudinal other end edge of the first mask  29  to the middle in the longitudinal direction toward one side. 
     As shown in  FIG. 8A , the first light transmitting mark  33  corresponds to the first insulating mark  22  shown in  FIG. 5A . The second light transmitting mark  34  corresponds to the second insulating mark  23  shown in  FIG. 5A . 
     The first light transmitting mark  33  and the second light transmitting mark  34  are disposed in the longitudinal other end portion of the first mask  29 . Each of the longitudinal other end edges of the first light transmitting mark  33  and the second light transmitting mark  34  is included in the longitudinal other end edge of the first mask  29 . Each of the first light transmitting mark  33  and the second light transmitting mark  34  extends from the longitudinal other end edge of the first mask  29  to the middle in the longitudinal direction toward one side. A shape of the first light transmitting mark  33  and the second light transmitting mark  34  is the same as that of the first insulating mark  22  and the second insulating mark  23  shown in  FIG. 5A . Further, both the first light transmitting mark  33  and the second light transmitting mark  34  are disposed in both end portions in the width direction of the first mask  29 . 
     As shown in  FIGS. 8B and 9B , the second mask  30  includes a second light transmitting pattern  35 , a third light transmitting mark  36 , the first light transmitting mark  33 , and the second light transmitting mark  34 . 
     The second light transmitting pattern  35  corresponds to the base intermediate portion  13  shown in  FIG. 5A . The second light transmitting pattern  35  extends from one end edge to the other end edge in the longitudinal direction of the second mask  30 . 
     The third light transmitting mark  36  shown in  FIG. 8B  corresponds to the third insulating mark  24  shown in  FIG. 5A . The third light transmitting mark  36  is disposed in the longitudinal one end portion of the second mask  30 . The longitudinal one end edge of the third light transmitting mark  36  is included in the longitudinal one end edge of the second mask  30 . The third light transmitting mark  36  extends from the longitudinal one end edge of the second mask  30  to the middle in the longitudinal direction toward the other side. A shape of the third light transmitting mark  36  is the same as that of the third insulating mark  24 . The third light transmitting mark  36  is disposed in both end portions in the width direction of the second mask  30 . 
     The first light transmitting mark  33  and the second light transmitting mark  34  (ref:  FIG. 8A ) in the second mask  30  shown in  FIG. 8B  have the same configuration (shape, arrangement, etc.) as the first light transmitting mark  33  and the second light transmitting mark  34  in the first mask  29 . 
     Further, in the second mask  30 , the third light transmitting mark  36  is offset with the first light transmitting mark  33  and the second light transmitting mark  34  when projected in the longitudinal direction. Specifically, the third light transmitting mark  36  is located between the first light transmitting mark  33  and the second light transmitting mark  34  when projected in the longitudinal direction. 
     When projected in the longitudinal direction, a width direction distance L 1  between the first light transmitting mark  33  and the third light transmitting mark  36 , and a width direction length L 2  between the third light transmitting mark  36  and the second light transmitting mark  34  are a length that serves as a reference for measurement of the amount of deviation to be described later. That is, the width direction length L 1  and L 2  are not dependent on the amount of deviation to be described later. That is, the width direction length L 1  and L 2  are an inherent amount in the second mask  30 . 
     As shown in  FIG. 8C , the third mask  31  includes a third light transmitting pattern  37  and the third light transmitting mark  36 . 
     The third light transmitting pattern  37  corresponds to the base other end portion  12  and the base intermediate portion  13  shown in  FIG. 5A . The third light transmitting pattern  37  extends from the longitudinal one end edge of the third mask  31  to the middle in the longitudinal direction toward the other end edge. 
     The third light transmitting mark  36  in the third mask  31  has the same configuration (shape, arrangement, etc.) as the third light transmitting mark  36  in the second mask  30 . 
     In the three masks  29 ,  30 , and  31  described above, each of the light transmitting pattern and the light transmitting mark is a light transmitting portion that transmits light in the next exposure. In the three masks  29 ,  30 , and  31 , a portion other than the light transmitting portion is a light shielding portion for blocking light. 
     Then, as shown in  FIGS. 8A and 9A , in this photolithography, first, the first mask  29  is disposed on one side in the thickness direction of the longitudinal one end portion of the photosensitive base precursor layer  28 . Subsequently, the photosensitive base precursor laser  28  is exposed through the first mask  29  (first exposure). Then, a latent image  38  corresponding to the first light transmitting pattern  32 , the first light transmitting mark  33 , and the second light transmitting mark  34  is formed in the photosensitive base precursor layer  28 . The latent image  38  is formed by irradiating light transmitting through the light transmitting pattern and the light transmitting mark to the photosensitive base precursor layer  28 . 
     Then, as shown in  FIGS. 8B and 9B , in this photolithography, instead of the first mask  29 , the second mask  30  is disposed on one side in the thickness direction of the photosensitive base precursor layer  28 . The second mask  30  is disposed on the other side in the longitudinal direction with respect to the arrangement portion of the first mask  29 , and at that time, the longitudinal one end portion of the second mask  30  is disposed with respect to the photosensitive base precursor layer  28  so as to overlap in the thickness direction with an opposing portion  55  facing the longitudinal other end portion of the first mask  29  in the photosensitive base precursor laser  28 . Subsequently, the photosensitive base precursor layer  28  is exposed through the second mask  30  (second exposure). Then, the latent image  38  corresponding to the second light transmitting pattern  35 , the third light transmitting mark  36 , the first light transmitting mark  33 , and the second light transmitting mark  34  is formed in the photosensitive base precursor laser  28 . 
     In the latent image  38 , the opposing portion  55  corresponding to the first light transmitting pattern  32  is overlapped with the portion facing the second light transmitting pattern  35 . 
     On the other hand, the latent image  38  (ref:  FIG. 9A ) corresponding to the first light transmitting mark  33  and the second light transmitting mark  34  at the time of the first exposure is not overlapped with (is offset with) the latent image  38  (ref:  FIG. 9B ) corresponding to the third light transmitting mark  36  at the time of the second exposure. Specifically, the latent image  38  (ref.  FIG. 9A ) corresponding to the first light transmitting mark  33  and the second light transmitting mark  34  at the time of the first exposure, and the latent image  38  (ref:  FIG. 9B ) corresponding to the third light transmitting mark  36  at the time of the second exposure are spaced apart from each other in the width direction. 
     Thus, in the boundary portion  21  between the first sheet area  19 A and the second sheet area  19 B, the latent image  38  formed using the third light transmitting mark  36  by the present exposure is added to the latent image  38  formed using the first light transmitting mark  33  and the second light transmitting mark  34  by the previous exposure. 
     Thereafter, as shown in  FIG. 8C , in this method, instead of the second mask  30 , the third mask  31  is disposed on one side in the thickness direction of the photosensitive base precursor layer  28 . The third mask  31  is disposed on the other side in the longitudinal direction with respect to the arrangement portion of the second mask  30 , and at that time, the longitudinal one end portion of the third mask  31  is disposed with respect to the photosensitive base precursor layer  28  so as to overlap in the thickness direction with the opposing portion  55  facing the longitudinal other end portion of the second mask  30  in the photosensitive base precursor layer  28 . Subsequently, the photosensitive base precursor layer  28  is exposed through the third mask  31 . Then, the latent image  38  corresponding to the third light transmitting pattern  37  and the third light transmitting mark  36  is formed in the photosensitive base precursor layer  28 . 
     As shown in  FIG. 8C , in the latent image  38 , the opposing portion  55  corresponding to the second light transmitting pattern  35  is overlapped with the portion facing the third light transmitting pattern  37 . 
     On the other hand, the latent image  38  (ref.  FIG. 8B ) corresponding to the first light transmitting mark  33  and the second light transmitting mark  34  at the time of the second exposure is not overlapped with (is offset, with) the latent image  38  (ref:  FIG 8C ) corresponding to the third light transmitting mark  36  at the time of the third exposure. Specifically, the latent image  38  (ref:  FIG 8B ) corresponding to the first light transmitting mark  33  and the second light transmitting mark  34  at the time of the second exposure, and the latent image  38  (ref  FIG. 8C ) corresponding to the third light transmitting mark  36  at the time of the third exposure are spaced apart from each other in the width direction. Thus, in the boundary portion  21  between the second sheet area  19 B and the thud sheet area  19 C, the latent image  38  formed using the thud light transmitting mark  36  by the present exposure is added to the latent image  38  formed using the first light transmitting mark  33  and the second light transmitting mark  34  by the previous exposure. 
     Thereafter, the photosensitive base precursor layer  28  in which the latent image  38  described above is formed is developed and heated, if necessary. 
     Thus, as shown in  FIG. 5A , the base insulating layer  9  and the insulating measurement mark portion  17  are formed at the same time. 
     Third Step 
     Thereafter, an amount of deviation of the masks  29 ,  30 , and  31  shown in  FIGS. 8A to 8C  is measured. 
       FIG. 12A  shows an embodiment in which in the boundary portion  21  between the first sheet area  19 A and the second sheet area  19 B, the first light transmitting pattern  32  of the first mask  29 , and the second light transmitting pattern  35  of the second mask  30  deviate. Further.  FIG. 12B  shows the base insulating layer  9  and the insulating measurement mark portion  17  formed by the first mask  29  and the second mask  30  described above. 
     As shown in  FIG. 12B , first, in the third step, the insulating measurement mark portion  17  in the boundary portion  21  between the first sheet area  19 A and the second sheet area  19 B is detected. 
     Subsequently, a width direction distance L 11  between the first insulating mark  22  and the third insulating mark  24  in the insulating measurement mark portion  17  is measured. Then, the distance L 11  is compared with the width direction distance L 1  (ref:  FIG. 8B ) (known) between the first light transmitting mark  33  and the third light transmitting mark  36 . As shown in  FIG 12A , a difference between the distance L 11  and the width direction distance L 1  is obtained as a width direction deviation of the longitudinal other end portion of the first light transmitting pattern  32  of the first mask  29  with the longitudinal one end portion of the second light transmitting pattern  35  of the second mask  30 . As shown in  FIG. 12B , this deviation corresponds to a deviation between the end edge in the width direction of the base intermediate portion  13  of the first sheet area  19 A and the end edge in the width direction of the base intermediate portion  13  of the second sheet area  19 B in the opposing portion  55  of the photosensitive base precursor layer  28 . 
     At the same time, a width direction distance L 12  between the third insulating mark  24  and the second insulating mark  23  is measured. Then, the distance L 12  is compared with the width direction length L 2  (ref:  FIG. 8B ) (known) between the third light transmitting mark  36  and the second light transmitting mark  34 . As shown in  FIG. 12A , a difference between the distance L 12  and the width direction length L 2  is obtained as a width direction deviation of the longitudinal other end portion of the first light transmitting pattern  32  of the first mask  29  with the longitudinal one end portion of the second light transmitting pattern  35  of the second mask  30 . As shown in  FIG. 12B , this deviation corresponds to a deviation between the end edge in the width direction of the base intermediate portion  13  of the first sheet area  19 A and the end edge in the width direction of the base intermediate portion  13  of the second sheet area  19 B. 
     The measurement described above is carried out in the insulating measurement mark portion  17  in both end portions in the width direction, and also carried out in the insulating measurement mark portion  17  of the boundary portion  21  between the second sheet area  19 B and the third sheet area  19 C. 
     Thereafter, the position in the width direction of the masks  29 ,  30 , and  31  with respect to the photosensitive base precursor layer  28  in which the formation of the base insulating layer  9  is scheduled next is adjusted based on the deviation of the masks  29 ,  30 , and  31 . 
     When the deviation of the base intermediate portion  13  described above is within the range of tolerances, the following fourth step or later is carried out. On the other hand, when the deviation of the end edge in the width direction of the base intermediate portion  13  is outside the range of tolerances, the following fourth step and later is not carried out and excluded from a production target (production line). That is, when the wiring circuit board sheet  1  is a defective component, the following fourth step and later is not carried out and excluded from the production target (production line). Thus, it is possible to direct a material for the conductive pattern  5  in the fifth step, and a material for the cover insulating layer  10  in the sixth step to the production of a non-defective conductive pattern  5  and cover insulating layer  10 . 
     Fourth Step 
     In the fourth step, as shown in  FIGS. 5B and 7B , the conductive pattern  5  and the conductive measurement mark portion  18  are formed. 
     In the fourth step, first, as shown in  FIG. 11A , a seed film  50  is formed on the surfaces (including one surface in the thickness direction) of the support sheet  2 , the base insulating layer  9 , and the insulating measurement mark portion  17 . 
     Subsequently, as shown in  FIGS. 11A to 11C , a plating resist  51  is formed by photolithography. 
     In the photolithography, as shown in  FIG. 11A , first, a photoresist  49  is disposed on the surface of the seed film  50 . Specifically, a photosensitive dry film resist is laminated on the surface of the seed film  50  to form the photoresist  49  on the entire surface of the seed film  50 . 
     Thereafter, as shown in  FIGS. 10A to 11B , the photoresist  49  is exposed a plurality of times while the three masks  39 ,  40 , and  41  are sequentially arranged in the longitudinal direction. 
     As shown in  FIGS. 10A to 10C , the three masks  39 ,  40 , and  41  are the fourth mask  39 , the fifth mask  40 , and the sixth mask  41 , respectively. Each of the fourth mask  39 , the fifth mask  40 , and the sixth mask  41  has a generally rectangular outer shape when viewed from the top. 
     As shown in  FIG. 10A , the fourth mask  39  includes a fourth light shielding pattern  42 , a fourth light shielding mark  43 , and a fifth light shielding mark  44 . 
     The fourth light shielding pattern  42  corresponds to the conductive one end portion  6  and the conductive intermediate portion  8  shown in  FIG. 5B . The longitudinal other end edge of the fourth light shielding pattern  42  is included m the longitudinal other end edge of the fourth mask  39 . The fourth light shielding pattern  42  extends from the longitudinal other end edge of the fourth mask  39  to the middle in the longitudinal direction toward one side. 
     The fourth light shielding mark  43  shown in  FIG. 10A  corresponds to the first conductive mark  25  shown in  FIG. 5B . The fifth light shielding mark  44  corresponds to the second conductive mark  26  shown in  FIG. 5B . 
     The fourth light shielding mark  43  and the fifth light shielding mark  44  are disposed in the longitudinal other end portion of the fourth mask  39 . Each of the longitudinal other end edges of the fourth light shielding mark  43  and the fifth light shielding mark  44  is included in the longitudinal other aid edge of the fourth mask  39 . Each of the fourth light shielding mark  43  and the fifth light shielding mark  44  extends from the longitudinal other end edge of the fourth mask  39  to the middle in the longitudinal direction toward one side. A shape of the fourth light shielding mark  43  and the fifth light shielding mark  44  is the same as that of the first conductive mark  25  and the second conductive mark  26  shown in  FIG. 5B . Further, both the fourth light shielding mark  43  and the fifth light shielding mark  44  are disposed in both end portions in the width direction of the fourth mask  39 . 
     As shown in  FIG. 10B , the fifth mask  40  includes a fifth light shielding pattern  45 , a sixth light shielding mark  46 , the fourth light shielding mark  43 , and the fifth light shielding mark  44 . Furthermore, the fifth mask  40  includes a protective portion  52 . 
     The fifth light shielding pattern  45  corresponds to the conductive intermediate portion  8  shown in  FIG. 5B . The fifth light shielding pattern  45  extends from one end edge to the other end edge in the longitudinal direction of the second mask  30 . 
     The sixth light shielding mark  46  shown in  FIG. 10B  corresponds to the third conductive mark  21  shown in  FIG. 5B . The sixth light shielding mark  46  is disposed in the longitudinal one end portion of the fifth mask  40 . The longitudinal one end edge of the sixth light shielding mark  46  is included in the longitudinal one end edge of the fifth mask  40 . The sixth light shielding mark  46  extends from the longitudinal one end edge of the fifth mask  40  to the middle in tire longitudinal direction toward the other side. A shape of the sixth light shielding mark  46  is the same as that of the third conductive mark  27 . 
     The fourth light shielding mark  43  and the fifth light shielding mark  44  in the fifth mask  40  have the same configuration (shape, arrangement, etc.) as the fourth light shielding mark  43  and the fifth light shielding mark  44  in the fourth mask  39 . 
     Further, in the fifth mask  40 , the sixth light shielding mark  46  is offset with the fourth light shielding mark  43  and the fifth light shielding mark  44  when projected in the longitudinal direction. Specifically, the sixth light shielding mark  46  is located between the fourth light shielding mark  43  and the fifth light shielding mark  44  when projected in the longitudinal direction. 
     When projected in the longitudinal direction, a width direction distance L 3  between the fourth light shielding mark  43  and the sixth light shielding mark  46 , and a width direction length L 4  between the sixth light shielding mark  46  and the fifth light shielding mark  44  are a length that serves as a reference for measurement of the amount of deviation to be described later. That is, the width direction length L 3  and L 4  are not dependent on the amount of deviation to be described later. That is, the width direction length L 3  and L 4  are an inherent amount in the fifth mask  40 . 
     The protective portion  52  is disposed on both sides in the width direction of the sixth light shielding mark  46  in the longitudinal one end portion of the fifth mask  40 . Specifically, the two protective portions  52  are a light shielding portion including a pattern obtained by sliding the fourth light shielding mark  43  and the fifth light shielding mark  44  described above on one side in the longitudinal direction (parallel movement). 
     As shown in  FIG. 10C , the sixth mask  41  includes a sixth light shielding pattern  47  and the sixth light shielding mark  46 . Furthermore, the sixth mask  41  includes the protective portion  52 . 
     The sixth light shielding pattern  47  corresponds to the conductive other end portion  7  and the conductive intermediate portion  8  shown in  FIG 5B . The sixth light shielding pattern  47  extends from the longitudinal one end edge of the sixth mask  41  to the middle in the longitudinal direction toward the other side. The sixth light shielding mark  46  in the sixth mask  41  has the same configuration (shape, arrangement, etc.) as the sixth light shielding mark  46  in the fifth mask  40 . 
     The configuration of the protective portion  52  is the same as that of the protective portion  52  of the fifth mask  40 . 
     In the three masks  30 ,  40 , and  41  described above, each of the light shielding pattern, the light shielding mark, and the protective portion is a light shielding portion for blocking light in the next exposure. In the three masks  39 ,  40 , and  41 , a portion other than the light shielding portion is a light transmitting portion that transmits light. 
     Then, as shown in  FIGS. 10A and 11A , in this photolithography, first, the fourth mask  39  is disposed on one side in the thickness direction of the longitudinal one end portion of the photoresist  49 . Subsequently, the photoresist  49  is exposed through the fourth mask  39  (first exposure). Then, as shown in  FIG. 11A , a latent image  48  corresponding to the fourth light shielding pattern  42 , the fourth light shielding mark  43 , and the fifth light shielding mark  44  is formed in the photoresist  49 . The latent image  48  is an inverted pattern of a portion irradiated by light transmitting through the light transmitting portion other than the light shielding pattern and the light shielding mark in the photoresist  49 . A pattern in which light is blocked by the light shielding pattern and the light shielding mark is formed in the photoresist  49 . 
     Then, as shown in  FIGS. 10B and 11C , in this photolithography, instead of the fourth mask  39 , the fifth mask  40  is disposed on one side in the thickness direction of the photoresist  49 . The fifth mask  40  is disposed on the other side in the longitudinal direction with respect to the arrangement portion of the fourth mask  39 , and at that time, the longitudinal one end portion of the fourth mask  39  is disposed with respect to the photoresist  49  so as to overlap in the thickness direction with the opposing portion  55  facing the longitudinal other end portion of the fourth mask  39  in the photoresist  49 . Subsequently, the photoresist  49  is exposed through the fifth mask  40  (second exposure). Then, the latent image  48  corresponding to the fifth light shielding pattern  45 , the fourth light shielding mark  43 , the fifth light shielding mark  44 , and the sixth light shielding mark  46  is formed. 
     In the latent image  48 , the opposing portion  55  corresponding to the fourth light shielding pattern  42  is overlapped with the portion facing the fifth light shielding pattern  45 . 
     On the other hand, the latent image  48  (ref:  FIG. 11A ) corresponding to the fourth light shielding mark  43  and the fifth light shielding mark  44  at the time of the first exposure is not overlapped with (is offset with) the latent image  48  (ref:  FIG. 11B ) corresponding to the sixth light shielding mark  46  at the tune of the second exposure. Specifically, the latent image  48  (ref:  FIG. 11A ) corresponding to the fourth light shielding mark  43  and the fifth light shielding mark  44  at the time of the first exposure, and the latent image  48  (ref:  FIG. 11B ) corresponding to the sixth light shielding mark  46  at the time of the second exposure are spaced apart from each other in the width direction. Thus, in the boundary portion  21  between the first sheet area  19 A and the second sheet area  19 B, the latent image  48  formed using the sixth light shielding mark  46  by the present exposure is added to the latent image  48  formed using the fourth light shielding mark  43  and the fifth light shielding mark  44  by the previous exposure. 
     The latent image  48  corresponding to the fourth light shielding mark  43 , the fifth light shielding mark  44 , and the sixth light shielding mark  46  is formed in the photoresist  49 . 
     The protective portion  52  of the fifth mask  40  includes the latent image  48  formed in the photoresist  49  by the fourth light shielding mark  43  and the fifth light shielding mark  44  of the fourth mask  39  at the time of the first exposure. Therefore, light is not irradiated to the latent image  48  described above even by the second exposure through the fifth mask  40 . That is, the latent image  48  corresponding to the fourth light shielding mark  43  and the fifth light shielding mark  44  at the time of the first exposure is also protected by the second exposure through the fifth mask  40 . 
     Thereafter, as shown in  FIG. 10C , in this photolithography, instead of the fifth mask  40 , the sixth mask  41  is disposed on one side in the thickness direction of the photoresist  49 . The sixth mask  41  is disposed on the other side in the longitudinal direction with respect to the arrangement portion of the fifth mask  40 , and at that time, the longitudinal one end portion of the sixth mask  41  is disposed with respect to the photoresist  49  so as to overlap in the thickness direction with the opposing portion  55  facing the longitudinal other end portion of the fifth mask  40  in the photoresist  49 . Subsequently, the photoresist  49  is exposed through die sixth mask  41 . Then, the latent image  48  corresponding to the sixth light shielding pattern  47  and the sixth light shielding mark  46  is formed. 
     In the latent image  48 , the opposing portion  55  corresponding to the fifth light shielding pattern  45  is overlapped with the portion facing the sixth light shielding pattern  47 . 
     On the other hand, the latent image  48  corresponding to the fourth light shieling mark  43  and the fifth light shielding mark  44  at the time of the second exposure is not overlapped with (is offset with) the latent image  48  (not shown) corresponding to the sixth light shielding mark  46  at the time of the third exposure. Specifically, the latent image  48  corresponding to the fourth light shieling mark  43  and the fifth light shielding mark  44  at the time of the second exposure, and the latent image  48  corresponding to the sixth light shielding mark  46  at the time of the third exposure are spaced apart from each other in the width direction. Thus, in the boundary portion  21  between the second sheet area  19 B and the third sheet area  19 C, the latent image  48  formed using the sixth light shielding mark  46  by the present exposure is added to the latent image  48  formed using the fourth light shielding mark  43  and the fifth light shielding mark  44  by the previous exposure. 
     The protective portion  52  of the sixth mask  41  includes the latent image  48  formed in the photoresist  49  by the fourth light shielding mark  43  and the fifth light shielding mark  44  of the fifth mask  40  at the time of the second exposure. Therefore, light is not irradiated to the latent image  48  described above even by the third exposure through the sixth mask  41 . That is, the latent image  48  corresponding to the fourth light shielding mark  43  and the fifth light shielding mark  44  at the time of the second exposure is also protected by the third exposure through the sixth mask  41 . 
     Thereafter, the photoresist  49  in which the latent image  48  described above is formed is developed and heated, if necessary. 
     Thus, as shown in  FIG. 11C , the plating resist  51  of the inverted pattern of the conductive pattern  5 , the first conductive mark  25 , the second conductive mark  26 , and the third conductive mark  27  (ref:  FIG. 11D ) is formed. 
     As shown in  FIG. 11D , thereafter, the conductive pattern  5 , the first conductive mark  25 , the second conductive mark  26 , and the third conductive mark  27  are formed using the plating resist  51  by plating for supplying electric power to the seed film  50 . 
     Subsequently, as shown in  FIG. 3 , the plating resist  51  and the seed film  50  located on the other side in the thickness direction thereof are removed. 
     Thus, the conductive pattern . 5  and the conductive measurement mark portion  18  are formed at the same time. 
     Fifth Step 
     Thereafter, the amount of deviation of the masks  39 ,  40 , and  41  shown in  FIGS. 10A to 10C  is measured. 
       FIG. 13A  shows an embodiment in which in the boundary portion  21  between the first sheet area  19 A and the second sheet area  19 B, the fourth light shielding pattern  42  of the fourth mask  39 , and the fifth light shielding pattern  45  of the fifth mask  40  deviate. Further,  FIG. 13B  shows the conductive pattern  5  and the conductive measurement mark portion  18  formed by the fourth mask  39  and the fifth mask  40  described above. 
     As shown in  FIG. 13B , first, in the fifth step, the conductive measurement mark portion  18  in the boundary portion  21  between the first sheet area  19 A and the second sheet area  19 B is detected. Specifically, as shown in  FIG. 4 , since the conductive measurement mark portion  18  is located in the insulating measurement mark portion  17 , when the insulating measurement mark portion  17  is detected, the conductive measurement mark portion  18  can be easily detected. 
     Subsequently, a width direction distance L 13  between the first conductive mark  25  and the third conductive mark  27  in the conductive measurement mark portion  18  is measured. Then, the distance L 13  is compared with the width direction distance L 3  (ref:  FIG. 10B ) between the fourth light shielding mark  43  and the sixth light shielding mark  46 . As shown in  FIG. 13A , a difference between the distance L 13  and the width direction distance L 3  is obtained as a width direction deviation of the longitudinal other end portion of the fourth light shielding pattern  42  of the fourth mask  39  with the longitudinal one end portion of the fifth light shielding pattern  45  of the fifth mask  40 . As shown in  FIG. 13B , this deviation corresponds to a deviation between the end edge in the width direction of the conductive intermediate portion  8  of the first sheet area  19 A and the end edge m the width direction of the conductive intermediate portion  8  of the second sheet area  19 B in the opposing portion  55  of the photoresist  49 . 
     At the same time, a width direction distance L 14  between the third conductive mark  27  and the second conductive mark  26  is measured. Then, the distance L 14  is compared with the width direction length L 4  (ref:  FIG. 10B ) between the sixth light shielding mark  46  and the fifth light shielding mark  44 . As shown in  FIG. 13A , a difference between the distance L 14  and the width direction length L 4  is obtained as a width direction deviation of the longitudinal other end portion of the fourth light shielding pattern  42  of the fourth mask  39  with the longitudinal one end portion of the fifth light shielding pattern  45  of the fifth mask  40 . As shown in  FIG. 13B , this deviation corresponds to a deviation between the end edge in the width direction of the conductive intermediate portion  8  of the first sheet area  19 A and the end edge in the width direction of the conductive intermediate portion  8  of the second sheet area  19 B. 
     The measurement described above is carried out in the conductive measurement mark portion  18  in both end portions in the width direction, and also earned out in the conductive measurement mark portion  18  of the boundary portion  21  between the second sheet area  19 B and the third sheet area  19 C. 
     Thereafter, the position in the width direction of the masks  39 ,  40 , and  41  with respect to the photoresist  49  in which the formation of the conductive pattern  5  is scheduled next is adjusted based on the deviation of the masks  39 ,  40 , and  41 . 
     When the deviation of the conductive intermediate portion  8  described above is within the range of tolerances, the following sixth step is carried out. On the other hand, when the deviation of the conductive intermediate portion  8  is outside the range of tolerances, the following sixth step is not carried out and excluded from a production target (production line). That is, when the wiring circuit board sheet  1  is a defective component, the following sixth step is not carried out and excluded from the production target (production line). Thus, it is possible to direct a material for the cover insulating layer  10  in the sixth step to the production of a non-defective cover insulating layer  10 . 
     Sixth Step 
     As shown in  FIGS. 2 and 5C , the cover insulating layer  10  is formed on one surface in the thickness direction of the base insulating layer  9  so as to cover a wire of the conductive pattern  5 . 
     Thus, the wiring circuit board sheet  1  including the support sheet  2 , the wiring circuit board  3 , and the plurality of measurement mark portions  4  is obtained 
     Function and Effect of One Embodiment 
     Then, in this method, as shown in  FIG 4 , the distance L 13  between the first conductive mark  25  and the third conductive mark  27  is measured, and the distance L 13  is compared with the distance L 3  ( FIG. 10B ) between the fourth light shielding mark  43  and the sixth light shielding mark  46  in the projected surface when projected in the longitudinal direction. 
     By determining the difference between the distance L 13  and the distance L 1 , it is possible to measure the amount of deviation between the longitudinal other end portion of the fourth mask  39  and the longitudinal one end portion of the fifth mask  40 . 
     Therefore, thereafter, it is possible to adjust the arrangement of the masks  39 ,  40 , and  41  when the same fourth step is carried out. 
     Furthermore, the amount of deviation between the longitudinal other end portion of the conductive intermediate portion  8  corresponding to the fourth light shielding pattern  42  of the fourth mask  39  and the longitudinal one end portion of the conductive intermediate portion  8  corresponding to the fourth light shielding pattern  42  of the fifth mask  40  can be accurately measured. The amount of deviation between the longitudinal other end portion of the conductive intermediate portion  8  corresponding to the fourth light shielding pattern  42  of the fifth mask  40  and the longitudinal one end portion of the conductive intermediate portion  8  corresponding to the fourth light shielding pattern  42  of the sixth mask  41  can be also accurately measured in the same manner as described above. 
     In this method, by measuring both the distance L 13  between the first conductive mark  25  and the third conductive mark  27 , and the width direction distance L 12  between the third insulating mark  24  and the second insulating mark  23 , the amount of deviation between the longitudinal other end portion of the fourth mask  39  and the longitudinal one end portion of the fifth mask  40  can be accurately measured. Therefore, the amount of deviation between the longitudinal other end portion of the conductive intermediate portion  8  corresponding to the fifth light shielding pattern  45  of the fourth mask  39  and the longitudinal one end portion of the conductive intermediate portion  8  corresponding to the fifth light shielding pattern  45  of the fifth mask  40  can be more accurately measured. The amount of deviation between the longitudinal other end portion of the conductive intermediate portion  8  corresponding to the fourth light shielding pattern  42  of the fifth mask  40  and the longitudinal one end portion of the conductive intermediate portion  8  corresponding to the fourth light shielding pattern  42  of the sixth mask  41  can be also more accurately measured in the same manner as described above. Therefore, it is possible to accurately determine the defectiveness of the conductive pattern  5 . 
     Furthermore, in this method, in one boundary portion  21 , the plurality of (two) conductive measurement mark portions  18  are spaced apart from each other in the width direction, so that, for example, by comparing the distance L 13  of the conductive measurement mark portion  18  on one side in the width direction with the distance L 13  of the conductive measurement mark portion  18  on the other side in the width direction, the rotation and the amount of rotation of the fifth mask  40  with respect to the position obtained by parallel movement (sliding) of the fourth mask  39  toward the other side in the longitudinal direction can be measured. 
     Further, in this method, the distance L 11  between the first insulating mark  22  and the third insulating mark  24  is measured, and the distance L 11  is compared with the distance L 1  between the first light transmitting mark  33  and the third light transmitting mark  36  in the projected surface when projected in the longitudinal direction. By determining the difference between the distance L 11  and the distance L 1 , the amount of deviation between the longitudinal other end portion of the first mask  29  and the longitudinal one end portion of the second mask  30  can be measured. 
     Therefore, it is possible to adjust the arrangement of the masks  29 ,  30 , and  31  when the same second step is carried out. 
     Furthermore, the amount of deviation between the longitudinal other end portion of the base intermediate portion  13  corresponding to tire first light transmitting pattern  32  of the first mask  29  and the longitudinal one end portion of the base intermediate portion  13  corresponding to the first light transmitting pattern  32  of the second mask  30  can be accurately measured. The amount of deviation between the longitudinal other end portion of the base intermediate portion  13  corresponding to the second light transmitting pattern  35  of the second mask  30  and the longitudinal one end portion of the base intermediate portion  13  corresponding to the third light transmitting pattern  37  of the third mask  31  can be also accurately measured. 
     Since the wiring circuit board  3  includes the conductive measurement mark portion  18 , it is possible to measure the amount of deviation of the conductive intermediate portion  8  of the conductive pattern  5  and accurately determine the defectiveness of the conductive pattern  5 . Therefore, in the wiring circuit board sheet  1 , the conductive pattern  5  is excellent in reliability. 
     Since the wiring circuit board  3  includes the insulating measurement mark portion  17 , it is possible to measure the amount of deviation of the base intermediate portion  13  of the base insulating layer  9  and accurately determine the defectiveness of the base insulating layer  9 . Therefore, in the wiring circuit board sheet  1 , the base insulating layer  9  is excellent in reliability. 
     Furthermore, in the wiring circuit board  3 , since the conductive measurement mark portion  18  is overlapped with the insulating measurement mark portion  17 , the configuration of the measurement mark portion  4  becomes compact. Further, of the insulating measurement mark portion  17  and the conductive measurement mark portion  18 , when one is detected, the other can be easily detected. 
     Modified Examples 
     Next, modified examples of one embodiment are described in the following modified examples, the same reference numerals are provided for members and steps corresponding to each of those in the above-described one embodiment, and their detailed description is omitted. One embodiment and each of the modified examples can be appropriately used in combination. Furthermore, the modified examples can achieve the same function and effect as that of the above-described one embodiment unless otherwise specified. 
     In  FIGS. 17A to 22C , in order to clearly show the arrangement and shape of the conductive measurement mark portion  18 , the insulating measurement mark portion  17  and the base insulating layer  9  are omitted. 
     In one embodiment, the third step is carried out before the fourth step. Alternatively, the third step can be also carried out after the fourth step. For example, the third step is carried out after the fourth step and simultaneously with the fifth step. 
     Or, for example, the third step and the fifth step can be also carried out simultaneously after the sixth step. 
     In one embodiment, the first conductive mark  25  and the second conductive mark  26  are formed and thereafter, the third conductive mark  27  is formed. They may be formed in the reversed order. 
     In this modified example, though not shown, the measurement mark portion  4  includes a cover insulating measurement mark that is the same layer as the cover insulating layer  10 . 
     Further, the insulating measurement mark portion  17  and the conductive measurement mark portion  18  may deviate from each other when viewed from the top. Preferably, the insulating measurement mark portion  17  is overlapped with the conductive measurement mark portion  18 . By this configuration, the configuration of the measurement mark portion  4  becomes compact. Further, of the insulating measurement mark portion  17  and the conductive measurement mark portion  18 , when one is detected, the other can be easily detected. 
     In the modified example, the measurement mark portion  4  includes only one of the insulating measurement mark portion  17  and the conductive measurement mark portion  18 . 
     In one embodiment, the conductive pattern  5  and the conductive measurement mark portion  18  are formed by plating. On the other hand, in the modified example, as shown in  FIGS. 14A to 14D , the conductive pattern  5  and the conductive measurement mark portion  18  are formed by etching. In the modified example, for example, an etching resist  61  is formed from the photoresist  49 . and a conductive sheet  60  is etched using the etching resist  61 . 
     Specifically, first, as shown in  FIG. 14A , the conductive sheet  60  is attached to the surfaces of the support sheet  2 , the base insulating layer  9 , and the insulating measurement mark portion  17  through an adhesive that is not shown. Subsequently, the photoresist  49  is laminated on one surface in the thickness direction of the conductive sheet  60 . 
     The photoresist  49  is exposed a plurality of times while the masks  39 ,  40 , and  41  are sequentially arranged. In the masks  39 ,  40 , and  41 , the light shielding patterns  42 ,  45 ,  47 , and the light shielding marks  43 ,  44 ,  46  shown in  FIGS. 10A to 11B  turn to be light transmitting patterns  62 ,  65 ,  67  and light transmitting marks  63 ,  64 ,  67 . The masks  39 ,  40 , and  41  do not include a protective portion. 
     Each of the light transmitting patterns  62 ,  65 , and  67  and each of the light transmitting marks  63 ,  64 , and  66  have the same shape and arrangement as each of the light shielding patterns  42 ,  45 , and  47  and each of the light shielding marks  43 ,  44 , and  46  of one embodiment. The fourth mask  39  includes the fourth light transmitting pattern  62 , the fourth light transmitting mark  63 , and the fifth light transmitting mark  64 . The fifth mask  40  includes the fifth light transmitting pattern  65  and the sixth light transmitting mark  66 . The sixth mask  41  includes the sixth light transmitting pattern  67  and the sixth light transmitting mark  66 . 
     In the first exposure using the fourth mask  39 , the latent image  48  by irradiation of light transmitting through the fourth light transmitting pattern  62 , the fourth light transmitting mark  63 , and the fifth light transmitting mark  64  is formed in the photoresist  49 . 
     In the second exposure using the fifth mask  40 , the latent image  48  by irradiation of light transmitting through the sixth light transmitting pattern  65  is newly formed in the photoresist  49 . 
     As shown in  FIG. 14C , the photoresist  49  is developed to form the etching resist  61 . 
     Thereafter, as shown in  FIG. 14D , by etching the conductive sheet  60  exposed from the etching resist  61 , the conductive measurement mark portion  18  and the conductive pattern  5  are formed. 
     Thereafter, as shown in  FIG. 7B , the etching resist  61  is removed. 
     Further, in the modified example, as shown in  FIGS. 15A to 15C , the photoresist  49  is exposed a plurality of times while the same mask is sequentially arranged in the longitudinal direction. That is, the photoresist  49  is exposed a plurality of times while the same mask used only for the formation of the conductive intermediate portion  8 , that is, other than the mask used for the formation of the conductive one end portion  6  and the conductive other end portion  7  of the conductive pattern  5  is sequentially arranged in the longitudinal direction. 
     Specifically, after the second exposure (ref:  FIG. 15A ), as shown in  FIG. 15B , the fifth mask  40  used in the second exposure is slid (moved) toward the other side in the longitudinal direction. At this time, the sliding fifth mask  40  is overlapped with the opposing portion  55  described above in the photoresist  49 . 
     In this modified example, the photoresist  49  is exposed four times through the mask, and in each of both end portions in the width direction of the wiring circuit board sheet  1 , the three measurement mark portions  4  are formed. 
     Although not shown, the photoresist  49  is exposed twice through the fifth mask  40 , and in each of both end portions in the width direction of the wiring circuit board sheet  1 , the one measurement mark portion  4  can be formed. The number of exposures may be five times or more. 
     That is, the number of exposures is referred to as “n+1” (n is a natural number), and the number of measurement mark portions  4  in each of both end portions in the width direction of the wiring circuit board sheet  1  is referred to as “n” (n is a natural number). 
     Further, though not shown, the measurement mark portion  4  can be formed only in one end portion in the width direction of the support sheet  2 . 
     Preferably, the measurement mark portion  4  is formed in both end portions in the width direction of the support sheet  2 . This allows the rotation of the mask and its amount to be measured. 
     As shown in  FIG. 16 , a wiring circuit board assembly sheet  90  in which the plurality of wiring circuit boards  3  are supported by the one support sheet  2  may be used instead of the wiring circuit board sheet  1 . The plurality of wiring circuit boards  3  are arranged to be adjacent to each other at a distance in the width direction. 
     The arrangement of the measurement mark portion  4  is not limited to the end portion in the width direction of the support sheet  2 . Although not shown, for example, the arrangement of the measurement mark portion  4  may be the central portion in the width direction. Although not shown, for example, the arrangement of the measurement mark portion  4  may be between the wiring circuit boards  3  adjacent to each other in the width direction. 
     As shown in  FIGS. 17A to 17C , the fourth light shielding mark  43 , the fifth light shielding mark  44 , and the sixth light shielding mark  46  are spaced apart from both end edges in the longitudinal direction of the masks  39 ,  40 , and  41 . 
     Specifically, the fourth light shielding mark  43  and the fifth light shielding mark  44  are spaced apart front the longitudinal other end edge in each of the fourth mask  39  and the fifth mask  40 . 
     The sixth light shielding mark  46  is spaced apart front the longitudinal one end edge in each of the fifth mask  40  and the sixth mask  41 . 
     As shown in  FIG 18C , the conductive measurement mark portion  18  (one example of a first measurement mark portion) does not include the second conductive mark  26  (one example of the other portion, ref:  FIG. 4 ), and can also include only the first conductive mark  25  (one example of one portion). 
     Each of the fourth mask  39  and the fifth mask  40  does not include the fifth light shielding mark  44  (ref:  FIGS. 10A to 10B ), and includes the fourth light shielding mark  43 . 
     As shown in  FIGS. 19A to 19B , the number of the sixth light shielding mark  46  may be two. The two sixth light shielding marks  46  are arranged to be adjacent to each other at a distance in the width direction. 
     As shown in  FIG. 19C , the conductive measurement mark portion  18  includes the two third conductive marks  27  corresponding to the two sixth light shielding marks  46 . 
     As shown in  FIG. 20C , the conductive measurement mark portion  18  has a double rectangular frame shape when viewed from the top. The conductive measurement mark portion  18  includes a first portion  71  and a second portion  72 . 
     The first portion  71  has a rectangular frame shape when viewed from the top. The first portion  71  includes the first conductive mark  25 , the second conductive mark  26 , and two first connecting pieces  73  connecting both end edges in the longitudinal direction of these. 
     The second portion  72  is disposed at the inside of the first portion  71  so as to be surrounded by the first portion  71 . The second portion  72  has a rectangular frame shape when viewed from the top. The second portion  72  includes the two third conductive marks  27 , and two second connecting pieces  74  connecting both end edges in the longitudinal direction of these. 
     As shown in  FIGS. 20A to 20B , the fourth mask  39  and the fifth mask  40  include one light shielding mark  81  corresponding to the first portion  71  find including the fourth light shielding mark  43  and the fifth light shielding mark  44  (ref:  FIGS. 10A to 10B ) in the longitudinal other end portion. 
     The fifth mask  40  includes another light shielding mark  82  corresponding to the second portion  72  and including the two sixth light shielding marks  46  in the longitudinal one end portion. 
     As shown in  FIG. 21C , the conductive measurement mark portion  18  has a double circular ring shape when viewed from the top. The conductive measurement mark portion  18  includes the first portion  71  and the second portion  72 . 
     The first portion  71  has a circular ring shape when viewed from the top. The first portion  71  integrally includes the first conductive mark  25  in a semicircular arc shape when viewed from the top and the second conductive mark  26  in a semicircular arc shape when viewed from the top. 
     The second portion  72  includes one third conductive mark  27  in a semicircular arc shape when viewed from the top and another third conductive mark  27  in a semicircular arc shape when viewed from the top. 
     As shown in  FIG. 22C , the conductive measurement mark portion  18  includes a first U-shaped portion (first square U-shaped portion)  75 , and a second U-shaped portion (second square U-shaped portion)  76  so as to deviate in the width direction. 
     The first U-shaped portion  75  has a shape that opens toward the other side in the longitudinal direction. The first U-shaped portion  75  integrally includes two first opposing pieces  77  as one example of a first conductive mark, and a first connecting piece  78 . The two first opposing pieces  77  are spaced apart from each other in the width direction, each extending in the longitudinal direction. The first connecting piece  78  connects the longitudinal one end edges of the two first opposing pieces  77 . 
     The second U-shaped portion  76  has a shape that opens toward one side in the longitudinal direction. The second U-shaped portion  76  integrally includes two second opposing pieces  70  as one example of a second conductive mark, and a second connecting piece  80 . The two second opposing pieces  79  are spaced apart from each other in the width direction, each extending in the longitudinal direction. The second connecting piece  80  connects the longitudinal other end edges of the two second opposing pieces  79 . 
     As shown in  FIGS. 22A to 22B , the fourth mask  39  and the fifth mask  40  include one light shielding mark  81  corresponding to the first U-shaped portion  75  and including the fourth light shielding mark  43  and the fifth light shielding mark  44  in the longitudinal other end portion. 
     The fifth mask  40  includes another light shielding mark  82  corresponding to the second U-shaped portion  76  and including the two sixth light shielding marks  46  in the longitudinal one end portion. 
     In  FIGS. 15A to 15C , the mask forming the conductive one end portion  6  and the mask forming the conductive other end portion  7  are different from the mask forming the conductive intermediate portion  8 . Alternatively, for example, as shown in  FIGS. 23A to 23C , they may be all the same mask. 
     A mask  53  used in the exposure in the fourth step includes the fourth light shielding pattern  42 . The fourth light shielding pattern  42  extends from one end edge to the other end edge in the longitudinal direction of the mask  53 . A width of the fourth light shielding pattern  42  is the same over the longitudinal direction. The fourth light shielding pattern  42  has a generally linear shape when viewed from the top. 
     As shown in  FIG. 23A , the mask  53  is disposed on one side in the thickness direction of die longitudinal one end portion of the photoresist  49 , and subsequently, the photoresist  49  is exposed through the mask  53  (first exposure). 
     As shown in  FIG. 23B , then, the mask  53  used in the first exposure is slid (moved) toward the other side in the longitudinal direction, and subsequently, the photoresist  49  is exposed through the mask  53  (second exposure). 
     As shown in  FIG. 23C , thereafter, the mask  53  used in the second exposure is further slid (moved) toward the other side in the longitudinal direction, and subsequently, the photoresist  49  is exposed through the mask  53  (third exposure). 
     That is, in the fourth step, the same mask  53  is used in all exposures. 
     As shown in  FIG 23D , thus, the plurality of linear conductive patterns  5  extending along the longitudinal direction are formed. 
     The longitudinal one end portion of the conductive pattern  5  is referred to as a one-side terminal of the same width as the conductive intermediate portion  8 . A first mark portion  118  disposed on both sides in the width direction of the one-side terminal includes the third conductive mark  27 , and does not include the first conductive mark  25  and the second conductive mark  26 . Therefore, the first mark portion  118  is not used for measuring the deviation of the mask  53  during the sliding of the mask  53 . 
     The longitudinal other end portion of the conductive pattern  5  is referred to as the other-side terminal of the same width as the conductive intermediate portion  8 . A second mark portion  119  disposed on both sides in the width direction of the other-side terminal includes the first conductive mark  25  and the second conductive mark  26 , and does not include the third conductive mark  27 . Therefore, the second mark portion  119  is not used for measuring the deviation of the mask  53  during the sliding of the mask  53   
     While the illustrative embodiments of the present invention are provided in the above description, such is for illustrative purpose only and it is not to be construed as limiting the scope of the present invention. Modification and variation of the present invention that will be obvious to those skilled in the art is to be covered by the following claims. 
     DESCRIPTION OF SYMBOLS 
     
         
           1  Wiring circuit board sheet 
           2  Support sheet 
           3  Wiring circuit board 
           4  Measurement mark portion 
           5  Conductive pattern 
           6  Conductive one end portion 
           7  Conductive other end portion 
           8  Conductive intermediate portion 
           9  Base insulating layer 
           10  Cover insulating layer 
           11  Base one end portion 
           12  Base other end portion 
           13  Base intermediate portion 
           17  Insulating measurement mark portion 
           18  Conductive measurement mark portion 
           19  Sheet area 
           21  Boundary portion 
           22  First insulating mark 
           23  Second insulating mark 
           24  Third insulating mark 
           25  First conductive mark 
           26  Second conductive mark 
           27  Thud conductive mark 
           28  Photosensitive base precursor layer 
           29  First mask 
           30  Second mask 
           31  Third mask 
           32  First light transmitting pattern 
           33  First light transmitting mark 
           34  Second light transmitting mark 
           35  Second light transmitting pattern 
           36  Third light transmitting mark 
           37  Third light transmitting pattern 
           39  Fourth mask 
           40  Fifth mask 
           41  Sixth mask 
           42  Fourth light shielding pattern 
           43  Fourth light shielding mark 
           44  Fifth light shielding mark 
           45  Fifth light shielding pattern 
           46  Sixth light shielding mark 
           47  Sixth light shielding pattern 
           49  Photoresist 
           53  Mask 
           55  Opposing portion 
           62  Fourth light transmitting pattern 
           63  Fourth light transmitting mark 
           64  Fifth light transmitting mark 
           65  Sixth light transmitting pattern 
           66  Fifth light shielding pattern 
           77  First opposing piece 
           79  Second opposing piece 
           90  Wiring circuit board assembly sheet