Wired circuit board with adhesive sheet and method for producing same

Abstract

To provide a wiring circuit board with an adhesive sheet that can separate the wiring circuit board from the adhesive sheet and smoothly mount such wiring circuit board in a narrow area and a manufacturing method of the same.SOLUTION: A wiring circuit board with an adhesive sheet 1 includes a wiring circuit board 2 including a base insulating layer 8, a conductor layer 9 disposed on one side in the thickness direction of the base insulating layer 8, and a cover insulating layer 10 disposed on one side in the thickness direction of the base insulating layer 8 so as to cover the conductor layer 9 and an adhesive sheet 2 disposed either on one side or on the other side of the wiring circuit board 2 in the thickness direction.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a wired circuit board with an adhesive sheet and a method for producing the same. [Background technology]

[0002] 2. Description of the Related Art Wired circuit board holding sheets in which a wired circuit board is held by a sheet are conventionally known.

[0003] For example, a wired circuit board holding sheet has been proposed that includes a wired circuit board, a joint portion, and a sheet that holds the wired circuit board via the joint portion (see, for example, Patent Document 1 below). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2007-012713 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the wired circuit board holding sheet described in Patent Document 1, the joint portion is cut to separate the wired circuit board from the sheet. The wired circuit board separated from the sheet has a cut piece (a piece) of the joint portion. Therefore, when the wired circuit board is mounted in a small space, there is a problem that the cut piece of the joint portion becomes an obstacle.

[0006] The present invention provides a wired circuit board with an adhesive sheet, which allows the wired circuit board to be separated from the adhesive sheet and smoothly mounted in a small area, and a method for producing the same. [Means for solving the problem]

[0007] The present invention (1) includes a wiring circuit board with an adhesive sheet, the wiring circuit board including a base insulating layer, a conductor layer arranged on one thickness-wise surface of the base insulating layer, and a cover insulating layer arranged on one thickness-wise surface of the base insulating layer so as to cover the conductor layer, and an adhesive sheet arranged on either one or the other thickness-wise surface of the wiring circuit board.

[0008] In the case of the wired circuit board with the adhesive sheet, the wired circuit board without the above-mentioned pieces (cut pieces) can be obtained simply by peeling the wired circuit board from the adhesive sheet. Therefore, the wired circuit board can be smoothly mounted in a small area.

[0009] The present invention (2) includes the wired circuit board with an adhesive sheet according to (1), wherein the wired circuit board has a length of 300 mm or more.

[0010] However, when the wired circuit board has a length of 300 mm or more, when the board is held by a sheet via joint portions, it is unavoidable to provide many joint portions, which increases the number of pieces described above, and as a result, the above-mentioned problems become apparent.

[0011] However, from this wired circuit board with adhesive sheet, a wired circuit board without the above-mentioned pieces (cut pieces) can be obtained. Therefore, even if the wired circuit board is long, it can be smoothly mounted in a small area.

[0012] The present invention (3) includes the wired circuit board with adhesive sheet according to (1) or (2), further comprising a reinforcing substrate surrounding the wired circuit board at a distance in a planar direction perpendicular to the thickness direction of the wired circuit board, and the adhesive sheet includes the wired circuit board and the reinforcing substrate when projected in the thickness direction, is continuous in the planar direction, and is disposed on a surface of the reinforcing substrate on the same side as the surface of the wired circuit board.

[0013] This wired circuit board with adhesive sheet further comprises a reinforcing substrate that is included in the adhesive sheet and continues in the planar direction when projected in the thickness direction, and therefore the adhesive sheet corresponding to the reinforcing substrate can be reinforced, and therefore the wired circuit board can be peeled off smoothly and reliably from the adhesive sheet.

[0014] The present invention (4) includes the wired circuit board with a pressure-sensitive adhesive sheet according to (3), in which the reinforcing substrate includes a reinforcing conductor layer.

[0015] In this wired circuit board with adhesive sheet, the reinforcing substrate includes a reinforcing conductor layer, so that the adhesive sheet corresponding to the reinforcing substrate can be further reinforced, and the wired circuit board can be peeled off from the adhesive sheet more smoothly and reliably.

[0016] The present invention (5) includes the wired circuit board with an adhesive sheet according to (4), in which the reinforcing conductor layer has a generally lattice shape in plan view.

[0017] In this wired circuit board with an adhesive sheet, the reinforcing conductor layer has a generally lattice shape when viewed from above, so that the adhesive sheet corresponding to the reinforcing substrate can be uniformly reinforced while reducing material costs.

[0018] The present invention (6) includes the wired circuit board with an adhesive sheet according to any one of (1) to (5), further comprising a metal support layer disposed on the other thickness-wise surface of the base insulating layer.

[0019] In this pressure-sensitive adhesive sheet-attached wired circuit board, since the wired circuit board further comprises a metal supporting layer, a wired circuit board with excellent toughness can be obtained.

[0020] The present invention (7) includes a method for manufacturing a wired circuit board with an adhesive sheet, comprising: a first step of forming a base insulating layer, a conductor layer, and a cover insulating layer in order toward one thickness direction on one thickness direction side of a support sheet to form a wired circuit board on the one thickness direction side of the support sheet; a second step of contacting a second support sheet with the one thickness direction side of the wired circuit board; and a third step of removing a portion of the support sheet corresponding to the wired circuit board.

[0021] In this method of manufacturing a wired circuit board with an adhesive sheet, a wired circuit board is formed on one thickness-wise side of a support sheet, a second support sheet is brought into contact with one thickness-wise side of the wired circuit board, and the portion of the support sheet that corresponds to the wired circuit board is removed, thereby providing a wired circuit board that does not have the above-mentioned pieces (remnants) through a simple method.

[0022] The present invention (8) includes the method for producing a wired circuit board with an adhesive sheet according to (7), further comprising a fourth step of removing the support sheet in the third step, and adhering an adhesive sheet to the other surface in the thickness direction of the wired circuit board after the third step, and a fifth step of removing the second support sheet after the fourth step.

[0023] In this method for producing a wiring circuit board with an adhesive sheet, the adhesive sheet is adhered to the other surface in the thickness direction of the wiring circuit board, and then the support sheet is removed. Therefore, by separating the wiring circuit board from the adhesive sheet, a wiring circuit board without the above-mentioned pieces (cut pieces) can be easily obtained.

[0024] The present invention (9) includes the method for producing a wired circuit board with an adhesive sheet according to (7), in which the second support sheet is an adhesive sheet.

[0025] In this method for manufacturing a wired circuit board with an adhesive sheet, one thickness direction side of the wired circuit board can be reliably reinforced by the second support sheet, which is an adhesive sheet, and in the subsequent third step, the support sheet is removed, so that the wired circuit board can be obtained simply and reliably.

[0026] The present invention (10) includes the method for producing a wired circuit board with a pressure-sensitive adhesive sheet according to any one of (7) to (9), wherein in the third step, a portion of the support sheet surrounding the wired circuit board is removed.

[0027] In this method for producing a wired circuit board with a pressure-sensitive adhesive sheet, the wired circuit board can be reliably separated from the outer portion of the support sheet.

[0028] The present invention (11) includes the method for producing a wired circuit board with an adhesive sheet described in (10), in which in the third step, a metal support layer is formed from the metal sheet to be placed on the other thickness-wise surface of the base insulating layer.

[0029] In this method for producing a wired circuit board with an adhesive sheet, a metal supporting layer is formed on the other surface of the base insulating layer in the thickness direction, so that a wired circuit board with excellent toughness can be obtained.

[0030] The present invention (12) includes the method for producing a wired circuit board with an adhesive sheet according to (10) or (11), further comprising a sixth step of transferring the wired circuit board from the adhesive sheet to a second adhesive sheet.

[0031] In this method for producing a wired circuit board with an adhesive sheet, in the sixth step, the wired circuit board is transferred from the adhesive sheet to the second adhesive sheet. Therefore, by separating the wired circuit board from the second adhesive sheet, a wired circuit board that does not have the above-mentioned pieces (cut pieces) can be easily obtained.

[0032] The present invention (13) includes the method for producing a wired circuit board with a pressure-sensitive adhesive sheet according to any one of (7) to (12), wherein the wired circuit board has a length of 300 mm or more.

[0033] However, when the wired circuit board has a length of 300 mm or more, when it is held by a sheet via joint portions, it becomes unavoidable to provide many joint portions, which increases the number of pieces described above, and therefore significantly increases the effort required to cut the pieces.

[0034] However, in this method for producing a wired circuit board with an adhesive sheet, a wired circuit board is obtained that does not have the above-mentioned pieces (offcuts), so even if the wired circuit board has a length of 300 mm or more, it can be produced by separating it from the adhesive sheet by the simple method of peeling it from the adhesive sheet.

[0035] The present invention (14) includes the method for producing a wired circuit board with an adhesive sheet according to any one of (7) to (13), in which in the first step, a reinforcing substrate is formed on one thickness-wise surface of the support sheet so as to surround the wired circuit board at a distance, and in the second step, the second support sheet is brought into contact with one surface of the reinforcing substrate.

[0036] In this method for producing a wired circuit board with an adhesive sheet, in the second step, the second support sheet is brought into contact with one surface of the reinforcing substrate, so that the second support sheet corresponding to the reinforcing substrate can be reinforced. Effect of the Invention

[0037] According to the wired circuit board with a pressure-sensitive adhesive sheet of the present invention, the wired circuit board can be smoothly mounted in a small area.

[0038] According to the method for producing a wired circuit board with a pressure-sensitive adhesive sheet of the present invention, a wired circuit board having no cut pieces can be obtained by a simple method. [Brief description of the drawings]

[0039] [Figure 1] FIG. 1 shows a plan view of a first embodiment of a wired circuit board with a pressure-sensitive adhesive sheet of the present invention. [Diagram 2]2A to 2F are cross-sectional views of the manufacturing process for the wired circuit board with the adhesive sheet shown in FIG. 1, in which FIG. 2A shows a first step of forming a wired circuit board on one thickness-wise surface of a support sheet, FIG. 2B shows a second step of contacting a second support sheet with one thickness-wise surface of the wired circuit board, FIG. 2C shows a third step of removing the support sheet, FIG. 2D shows a fourth step of adhering an adhesive sheet to one thickness-wise surface of the wired circuit board, FIG. 2E shows a fifth step of removing the second support sheet, and FIG. 2F shows a step of peeling the wired circuit board from the adhesive sheet. [Diagram 3] 3A to 3C are manufacturing process diagrams further explaining the process of forming the wired circuit board shown in FIG. 2A, where FIG. 3A shows the process of preparing a support sheet, FIG. 3B shows the process of forming a base insulating layer, and FIG. 3C shows the process of forming a conductor layer. [Figure 4] 4A and 4B show a catheter equipped with the printed circuit board shown in FIG. 1 and FIG. 2F, where FIG. 4A is a cross-sectional view along the longitudinal direction, and FIG. 4B is a cross-sectional view along line XX in FIG. 4A. [Diagram 5] 5A and 5B show a modified example of the wired circuit board with the adhesive sheet shown in FIG. 1 (an embodiment in which the reinforcing conductor layer has a generally lattice shape in plan view), with FIG. 5A showing a plan view and FIG. 5B showing a cross-sectional view. [Figure 6] FIG. 6 shows a modified example of the wired circuit board with an adhesive sheet shown in FIG. 1 (an embodiment in which the wired circuit board with an adhesive sheet includes a plurality of wired circuit boards), with FIG. 6A showing a plan view and FIG. 6B showing a cross-sectional view. [Figure 7] 7A to 7C are cross-sectional views of the manufacturing process of a second embodiment of the present invention, in which FIG. 7A shows a second step of adhering an adhesive sheet to one thickness-wise surface of a wiring circuit board, FIG. 7B shows a third step of removing the support sheet, and FIG. 7C shows a step of peeling the wiring circuit board from the adhesive sheet. [Figure 8] Figures 8A to 8D are cross-sectional views of the manufacturing process of a third embodiment of the present invention, in which Figure 8A shows a process of placing two photoresists respectively on a support sheet and a wiring circuit board, Figure 8B shows a process of exposing the first photoresist to form a latent image, Figure 8C shows a process of removing the second photoresist, and Figure 8D shows a second process of adhering an adhesive sheet to one thickness-wise surface of the wiring circuit board. [Figure 9] Figures 9E to 9H are cross-sectional views of the manufacturing process of the third embodiment of the present invention, following Figure 8D, in which Figure 9E shows a process of developing a first photoresist to form an etching resist, Figure 9F shows a process of removing the portion of the support sheet surrounding the wired circuit board by etching, Figure 9G shows a process of removing the etching resist, and Figure 9H shows a process of peeling the wired circuit board from the adhesive sheet. [Figure 10] 10A and 10B are cross-sectional views of the manufacturing process illustrating the sixth step of the fourth embodiment of the present invention, in which FIG. 10A shows a step of adhering a second adhesive sheet to the other thickness-wise surface of the wiring circuit board, and FIG. 10B shows a step of peeling the wiring circuit board from the adhesive sheet. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0040] A first embodiment of a wired circuit board with a pressure-sensitive adhesive sheet of the present invention will be described in order with reference to Fig. 1 to Fig. 4B. In Fig. 1, a cover insulating layer 10 (described later) is omitted in order to clearly show the shape of a conductor layer 9 (described later). Also, a reinforcing conductor layer 14 (described later) is omitted in order to clearly show the relative positions of a wired circuit board 3 (described later) and a reinforcing substrate 4 (described later).

[0041] 1 and 2E, the wired circuit board 1 with the adhesive sheet has a predetermined thickness and has a substantially sheet shape (including a plate shape) extending in a plane direction perpendicular to the thickness direction. Specifically, the wired circuit board 1 with the adhesive sheet has a substantially rectangular shape in plan view, with a long length in a first direction included in the plane direction and a short length in a second direction included in the plane direction and perpendicular to the first direction.

[0042] The wired circuit board 1 with an adhesive sheet includes an adhesive sheet 2, a wired circuit board 3, and a reinforcing substrate 4.

[0043] The adhesive sheet 2 has a predetermined thickness and has the same shape in plan view as the wired circuit board 1 with the adhesive sheet. The adhesive sheet 2 is flexible, and may be wound together with the wired circuit board 3 and the reinforcing substrate 4. The adhesive sheet 2 includes the wired circuit board 3 and the reinforcing substrate 4 in plan view. The adhesive sheet 2 is continuous in the surface direction. The adhesive sheet 2 has, for example, a supporting substrate (not shown) and an adhesive layer (not shown) disposed on one surface in the thickness direction. Examples of the supporting substrate include metal and resin. The adhesive layer is formed into a thin layer from a known adhesive (pressure-sensitive adhesive). As a result, at least one surface in the thickness direction of the adhesive sheet 2 has adhesiveness (slight tack). The thickness of the adhesive sheet 2 is not particularly limited, and is, for example, 10 μm or more, preferably 20 μm or more, and, for example, 200 μm or less, preferably 150 μm or less.

[0044] The adhesive strength (90 degree peel adhesion) of the adhesive sheet 2 to a polyimide plate at 25° C. is, for example, 0.05 (N / 20 mm) or more, preferably 0.1 (N / 20 mm) or more, and for example, 1 (N / 20 mm) or less, preferably 0.5 (N / 20 mm) or less. If the adhesive strength of the adhesive sheet 2 is equal to or greater than the above-mentioned lower limit, the adhesive sheet 2 can reliably adhere to the wiring circuit board 3 and the reinforcing substrate 4. If the adhesive strength of the adhesive sheet 2 is equal to or less than the above-mentioned upper limit, the wiring circuit board 3 can be easily peeled off from the adhesive sheet 2.

[0045] The wired circuit board 3 has flexibility. The wired circuit board 3 is included in the adhesive sheet 2 in a plan view. Specifically, the wired circuit board 3 is disposed in a first direction intermediate portion and a second direction intermediate portion of the adhesive sheet 2 in a plan view. The wired circuit board 3 has a predetermined thickness and has a generally rectangular shape in a plan view that is long in the first direction and short in the second direction. The wired circuit board 3 has both end faces in the first direction and both end faces in the second direction, and these end faces are specifically flat and do not include the above-mentioned pieces (cut pieces).

[0046] The other thickness-wise surface of the wired circuit board 3 contacts one thickness-wise surface of the adhesive sheet 2. Specifically, the other thickness-wise surface of the wired circuit board 3 adheres to (contacts) one thickness-wise surface of the adhesive sheet 2. In other words, the adhesive sheet 2 is disposed on the other thickness-wise surface (the surface on the other side) of the wired circuit board 3.

[0047] The dimensions of the wired circuit board 3 are not particularly limited, and the length (length in the first direction) L of the wired circuit board 3 is, for example, 30 mm or more, preferably 300 mm or more, more preferably 600 mm or more, even more preferably 800 mm or more, particularly preferably 1,000 mm or more, and for example, 6,000 mm or less, preferably 4,000 mm or less. If the length L of the wired circuit board 3 is the above-mentioned lower limit or more, it can be mounted in a long electronic device.

[0048] The width (length in the second direction) W of the wired circuit board 3 is, for example, 50 mm or less, preferably 25 mm or less, more preferably 15 mm or less, and for example, 0.01 mm or more. The ratio (W / L) of the width (length in the second direction) W to the length (length in the first direction) L of the wired circuit board 3 is, for example, 0.03 or less, preferably 0.01 or less, more preferably 0.005 or less, and for example, 0.00002 or more. If the width W is equal to or less than the above-mentioned upper limit, the wired circuit board 3 can be disposed in a narrow area. If the width ratio (W / L) is equal to or less than the above-mentioned upper limit, the wired circuit board 3 can be mounted in a long electronic device and in a narrow interior.

[0049] The wired circuit board 3 includes a base insulating layer 8, a conductor layer 9, and a cover insulating layer 10. The wired circuit board 3 preferably does not include an optical waveguide, and includes only the base insulating layer 8, the conductor layer 9, and the cover insulating layer 10.

[0050] The base insulating layer 8 has the same shape in a plan view as the wired circuit board 3. The base insulating layer 8 forms the other surface in the thickness direction of the wired circuit board 3. Examples of materials for the base insulating layer 8 include insulating resins such as polyimide. The thickness of the base insulating layer 8 is, for example, 3 μm or more and 50 μm or less.

[0051] The conductor layer 9 is disposed on one surface in the thickness direction of the base insulating layer 8. The conductor layer 9 integrally includes a plurality of wirings 11 extending in a first direction and a plurality of terminals 12 continuous with both ends of the plurality of wirings 11 in the first direction. Examples of materials for the conductor layer 9 include conductors such as copper. The thickness of the conductor layer 9 is, for example, 5 μm or more and 100 μm or less.

[0052] The cover insulating layer 10 is disposed on one surface in the thickness direction of the base insulating layer 8 so as to cover the wiring 11 and expose the terminals 12. The portion of the cover insulating layer 10 that covers the wiring 11 forms one surface in the thickness direction of the wired circuit board 3. Examples of materials for the cover insulating layer 10 include insulating resins such as polyimide. The thickness of the cover insulating layer 10 is, for example, 1 μm or more and 30 μm or less.

[0053] The reinforcing substrate 4 is contained in the adhesive sheet 2 in a plan view, and is disposed around the wiring circuit board 3 with a gap therebetween. The reinforcing substrate 4 is continuous along the circumferential direction of the wiring circuit board 3, and specifically has a generally rectangular frame shape in a plan view. The adhesive sheet 2 is disposed on the other thickness direction surface of the reinforcing substrate 4, which is on the same side as the other thickness direction surface of the wiring circuit board 3. In short, the other thickness direction surface of the reinforcing substrate 4 adheres to (contacts) one thickness direction surface of the adhesive sheet 2.

[0054] The reinforcing substrate 4 includes a reinforcing base layer 13, a reinforcing conductor layer 14, and a reinforcing cover layer 15. The reinforcing base layer 13, the reinforcing conductor layer 14, and the reinforcing cover layer 15 are each formed as the same layer as the above-mentioned base insulating layer 8, the conductor layer 9, and the cover insulating layer 10 of the wired circuit board 3, respectively.

[0055] Specifically, the reinforcing base layer 13 forms the other thickness-wise surface of the reinforcing substrate 4. The reinforcing base layer 13 has the same shape in a plan view as the reinforcing substrate 4. The material and thickness of the reinforcing base layer 13 are the same as those of the base insulating layer 8.

[0056] The reinforcing conductor layer 14 is included in the reinforcing base layer 13 in a planar view. Specifically, the reinforcing conductor layer 14 has a band shape narrower than the reinforcing base layer 13 in a planar view. The reinforcing conductor layer 14 is disposed on one surface in the thickness direction of the reinforcing base layer 13. The material and thickness of the reinforcing conductor layer 14 are the same as those of the conductor layer 9.

[0057] The reinforcing cover layer 15 is disposed on one thickness-wise surface and a side surface of the reinforcing conductor layer 14, and on a portion of one thickness-wise surface of the reinforcing base layer 13 that does not overlap with the reinforcing conductor layer 14. The reinforcing cover layer 15 forms one thickness-wise surface of the reinforcing substrate 4. The material and thickness of the reinforcing cover layer 15 are the same as those of the cover insulating layer 10.

[0058] The width W1 of the reinforcing substrate 4 is the distance between the inner surface and the outer surface of the reinforcing substrate 4, and is specifically, for example, 0.1 mm or more, preferably 0.5 mm or more, and for example, 50 mm or less, preferably 30 mm or less.

[0059] In the pressure-sensitive adhesive sheet 2, in a plan view, the region between the wired circuit board 3 and the reinforcing substrate 4 is defined as an isolation region 5. The isolation region 5 separates the wired circuit board 3 and the reinforcing substrate 4. The wired circuit board 3 and the reinforcing substrate 4 are not disposed in the isolation region 5. The outer peripheral surface of the wired circuit board 3 and the inner peripheral surface of the reinforcing substrate 4 face the isolation region 5. Furthermore, from the isolation region 5, one thickness-wise surface of the pressure-sensitive adhesive sheet 2 corresponding thereto is exposed to one thickness-wise side.

[0060] The width W2 of the isolation region 5 is the distance between the outer peripheral surface of the wired circuit board 3 and the inner peripheral surface of the reinforcing substrate 4, and is specifically, for example, 10 μm or more, preferably 20 μm or more, and for example, 2000 μm or less, preferably 1000 μm or less. If the width W2 of the isolation region 5 is equal to or greater than the above-mentioned lower limit, the wired circuit board 3 can be smoothly peeled off from the adhesive sheet 2. If the width W2 of the isolation region 5 is equal to or less than the above-mentioned upper limit, the adhesive sheet 2 can be reliably reinforced when the wired circuit board 3 is peeled off from the adhesive sheet 2.

[0061] Next, a method for producing the wired circuit board 1 with an adhesive sheet of the first embodiment will be described. This method includes a first step to a fifth step (see Figs. 2A to 2E). In this method, the first step to the fifth step are carried out in this order. [1st step] In the first step, as shown in Fig. 2A, a base insulating layer 8, a conductor layer 9, and a cover insulating layer 10 are formed in this order toward one side in the thickness direction on one surface in the thickness direction of a support sheet 17. At the same time, a reinforcing base layer 13, a reinforcing conductor layer 14, and a reinforcing cover layer 15 are formed in this order toward one side in the thickness direction. In this way, a wired circuit board 3 and a reinforcing board 4 are simultaneously manufactured on one surface in the thickness direction of the support sheet 17.

[0062] First, as shown in FIG. 3A, a support sheet 17 is prepared. The support sheet 17 is not particularly limited as long as it can support (secure) the adhesive sheet 2 and the wiring circuit board 3 from the other side in the thickness direction, and examples thereof include sheets having toughness, flexibility, rigidity, and the like. Examples of the support sheet 17 include metal plates such as stainless steel plates, resin sheets (including photosensitive resin sheets) such as polyimide sheets (non-adhesive sheets), and paper. From the viewpoint of ensuring excellent toughness and excellent rigidity, the support sheet 17 is preferably a metal sheet, and more preferably a stainless steel sheet. The support sheet 17 is a single layer or multiple layers (laminate). The thickness of the support sheet 17 is not particularly limited, and is, for example, 5 μm or more, preferably 15 μm or more, and, for example, 5,000 μm or less, preferably 500 μm or less.

[0063] Next, as shown in FIG. 3B, a photosensitive resin varnish is applied to one thickness direction surface of the support sheet 17, and the base insulating layer 8 and the reinforcing base layer 13 are simultaneously formed by photolithography. Next, as shown in FIG. 3C, the conductor layer 9 and the reinforcing conductor layer 14 are formed on one thickness direction surface of the base insulating layer 8 and the reinforcing base layer 13 by an additive method, a subtractive method, or the like. Thereafter, a photosensitive resin varnish is applied to one thickness direction surface of the conductor layer 9 and the reinforcing base layer 13, one thickness direction surface of the base insulating layer 8 exposed from the conductor layer 9, one thickness direction surface of the reinforcing base layer 13 exposed from the reinforcing conductor layer 14, and one thickness direction surface of the support sheet 17 exposed from the base insulating layer 8 and the reinforcing base layer 13, and the cover insulating layer 10 and the reinforcing cover layer 15 are simultaneously formed by photolithography, as shown in FIG. 2A.

[0064] Thereby, in the first step, the wired circuit board 3 and the reinforcing board 4 are simultaneously formed on one surface of the support sheet 17 in the thickness direction. [Second process] In the second step, as shown in FIG. 2B, second support sheet 18 is brought into contact with one surface in the thickness direction of wired circuit board 3 and reinforcing substrate 4.

[0065] 2A, second support sheet 18 is not particularly limited as long as it is a sheet that can support (secure) wired circuit board 3 and reinforcing substrate 4 from one side in the thickness direction, and examples thereof include a sheet (plate) similar to support sheet 17. As second support sheet 18, preferably, a resin sheet is used, more preferably, a resin sheet for resist, and even more preferably, from the viewpoint of easily removing second support sheet 18 in the fifth step (see FIG. 2F), a photosensitive resin sheet is used, and particularly preferably, a photosensitive dry film resist (specifically, a photosensitive dry film resist before exposure to light).

[0066] As shown in FIG. 2B, if second support sheet 18 is a flexible, conformable resin sheet, in the second step, second support sheet 18 comes into contact with the peripheral side surfaces of wired circuit board 3 and reinforcing substrate 4 and one thickness-wise surface of adhesive sheet 2 surrounding wired circuit board 3 and reinforcing substrate 4. [3rd step] In the third step, as shown in Fig. 2C, the support sheet 17 is removed. The method for removing the support sheet 17 is not particularly limited, and examples thereof include peeling and etching. By removing the support sheet 17, the other thickness direction side of the wiring circuit board 3, the other thickness direction side of the reinforcing substrate 4, and the other thickness direction side of the adhesive sheet 2 around the wiring circuit board 3 are exposed on the other thickness direction side. The other thickness direction sides of the wiring circuit board 3 and the reinforcing substrate 4 and the other thickness direction side of the adhesive sheet 2 are, for example, flush with each other.

[0067] In bottom view, the wired circuit board 3 and the reinforcing substrate 4 are spaced apart from each other. However, the second support sheet 18 supports them from at least one side in the thickness direction. Preferably, the second support sheet 18 supports the wired circuit board 3 and the reinforcing substrate 4 from both sides in the surface direction. Therefore, the wired circuit board 3 and the reinforcing substrate 4 do not detach from the second support sheet 18. In other words, the wired circuit board 3 and the reinforcing substrate 4 are held by the second support sheet 18. [4th step] 2D, the adhesive sheet 2 is adhered to the other thickness-wise surfaces of the wiring circuit board 3, the reinforcing substrate 4, and the second support sheet 18. One thickness-wise surface of the adhesive sheet 2 is brought into contact with the other thickness-wise surfaces of the wiring circuit board 3, the reinforcing substrate 4, and the second support sheet 18. [5th ​​step] 2E, the second support sheet 18 is removed. Methods for removing the second support sheet 18 include peeling, etching (wet etching, etc.), and the like.

[0068] This results in the wired circuit board 3 and the reinforcing substrate 4 being supported on one thickness-wise surface of the adhesive sheet 2. In other words, a wired circuit board 1 with an adhesive sheet is manufactured, which includes the wired circuit board 3, the reinforcing substrate 4, and the adhesive sheet 2 disposed on the other thickness-wise surfaces of the wired circuit board 3 and the reinforcing substrate 4.

[0069] In addition, when viewed in a plan view, there is a gap between the wired circuit board 3 and the reinforcing substrate 4, but since the adhesive sheet 2 supports the wired circuit board 3 and the reinforcing substrate 4 together from the other side in the thickness direction, the wired circuit board 3 and the reinforcing substrate 4 do not detach from the adhesive sheet 2.

[0070] Thereafter, as shown in Fig. 2F, the wired circuit board 3 is peeled off from the adhesive sheet 2. Specifically, when peeled off, the wired circuit board 3 moves to one side in the thickness direction relative to the adhesive sheet 2, as shown by the arrow in Fig. 2F.

[0071] The wired circuit board 3 is mounted on another electronic device. The electronic device is not particularly limited, and preferably includes a catheter.

[0072] A catheter mounted with a printed circuit board will be described with reference to Figs. 4A and 4B. The catheter 51 includes a printed circuit board 3, an electronic component 52 electrically connected to a terminal 12 of the printed circuit board 3, and a catheter tube 53 accommodating them. The catheter tube 53 has a long tubular shape. Preferably, the catheter tube 53 has a cylindrical shape. In a cross-sectional view along a direction perpendicular to the long direction, the maximum distance D between two inner surfaces on a line passing through the center of gravity of the catheter tube 53 (preferably, the inner diameter) is, for example, 50 mm or less, preferably 30 mm or less, more preferably 20 mm or less, and for example, 1 mm or more. If the maximum distance D is equal to or less than the above-mentioned upper limit, the catheter 51 can reduce the load on the human body.

[0073] (Functions and Effects of the First Embodiment) 2F, the wired circuit board 1 with the adhesive sheet can be obtained without any cut pieces (fragments) simply by peeling the wired circuit board 3 from the adhesive sheet 2. Therefore, the wired circuit board 3 can be smoothly mounted in a small area.

[0074] However, when the wired circuit board 3 has a length L of 300 mm or more and has the above-mentioned pieces (remnants), when the board is held by a sheet via joint parts, it becomes unavoidable to provide many joint parts, which increases the number of the above-mentioned pieces, and as a result, the above-mentioned problems become apparent.

[0075] However, a wired circuit board 3 that does not have the above-mentioned pieces (cut pieces) can be obtained from this wired circuit board 1 with an adhesive sheet. Therefore, even if the wired circuit board 3 is long, it can be smoothly mounted in a small area.

[0076] Moreover, when projected in the thickness direction, this wired circuit board 1 with adhesive sheet further includes a reinforcing substrate 4 that is included in the adhesive sheet 2 and continues in the planar direction. Therefore, the adhesive sheet 2 corresponding to the reinforcing substrate 4 can be reinforced. Therefore, the wired circuit board 3 can be peeled off from the adhesive sheet 2 smoothly and reliably.

[0077] In this wired circuit board 1 with adhesive sheet, the reinforcing substrate 4 includes a reinforcing conductor layer 14, which further reinforces the adhesive sheet 2 corresponding to the reinforcing substrate 4, and the wired circuit board 3 can be peeled off from the adhesive sheet 2 more smoothly and reliably.

[0078] In the manufacturing method of the wired circuit board 1 with an adhesive sheet, as shown in FIG. 2A, the wired circuit board 3 is formed on one thickness-wise surface of the support sheet 17, and then, as shown in FIG. 2B, a second support sheet 18 is brought into contact with one thickness-wise surface of the wired circuit board 3, and thereafter, as shown in FIG. 2C, the support sheet 17 is removed, thereby providing a wired circuit board 3 that does not have the above-mentioned pieces (cut pieces).

[0079] Furthermore, as shown in Fig. 2D, the adhesive sheet 2 is adhered to the other surface in the thickness direction of the wiring circuit board 3, and then the second support sheet 18 is removed as shown in Fig. 2E. Therefore, by peeling the wiring circuit board 3 from the adhesive sheet 2, the wiring circuit board 3 that does not have the above-mentioned pieces (cut pieces) can be easily obtained.

[0080] However, when the wired circuit board 3 has a length L of 300 mm or more, the number of the above-mentioned pieces increases, and therefore the labor required for cutting the pieces increases significantly.

[0081] However, in the manufacturing method of this wired circuit board 1 with adhesive sheet, a wired circuit board 3 that does not have the above-mentioned pieces (offcuts) is obtained, so that even if the wired circuit board 3 has a length L of 300 mm or more, the wired circuit board 3 can be manufactured by separating it from the adhesive sheet 2 by the simple method of peeling it from the adhesive sheet 2.

[0082] In the second step of this method, as shown in FIG. 2B, second support sheet 18 is brought into contact with one side of reinforcing substrate 4. Thereafter, as shown in FIG. 2C, even if support sheet 17 is removed in the step of FIG. 3, second support sheet 18, whose periphery is reinforced by reinforcing substrate 4, can reliably support wired circuit board 3.

[0083] In this method, in the second step shown in Fig. 2B, if the second support sheet 18 is flexible and has conformability, it covers both side surfaces of the wired circuit board 3, and can also cover the peripheral side surfaces of the terminals 12 (not shown in Fig. 2B) exposed from the cover insulating layer 10. Therefore, even when a stripping solution or an etching solution is used in the third step shown in Fig. 2C, the peripheral side surfaces of the terminals 12 can be protected from the stripping solution or the etching solution. Therefore, this wired circuit board 3 has excellent reliability.

[0084] <Modification> In the following modifications, the same components and steps as those in the first embodiment are given the same reference numerals, and detailed description thereof will be omitted. In addition, each modification can achieve the same effects as those in the first embodiment, unless otherwise specified. Furthermore, the first embodiment and its modifications can be appropriately combined.

[0085] 5A and 5B, the reinforcing conductor layer 14 has a generally lattice shape in plan view, which makes it possible to reduce material costs while uniformly reinforcing the adhesive sheet 2 corresponding to this reinforcing substrate 4.

[0086] The shape of the reinforcing conductor layer 14 in plan view is not limited to the above, and may be, for example, a honeycomb shape, a triangular shape, a dot shape, or the like, although not shown.

[0087] The adhesive sheet-attached wired circuit board 1 includes one wired circuit board 3, but may include a plurality of wired circuit boards 3, for example, as shown in FIG.

[0088] 6, the multiple wired circuit boards 3 are spaced apart in the first and second directions. The reinforcing substrate 4 is disposed continuously around each of the multiple wired circuit boards 3. Specifically, the reinforcing substrate 4 has a generally lattice shape in plan view.

[0089] In the third step of the first embodiment, as shown in Fig. 2C, the entire support sheet 17 is removed. In a modified example (not shown), only a portion of the support sheet 17 corresponding to the wired circuit board 3 is removed. More specifically, in this modified example, the portions of the support sheet 17 corresponding to the reinforcing substrate 4 and the isolation region 5 are left, and the portion corresponding to the wired circuit board 3 is removed. That is, in the present invention, it is sufficient to remove at least the portion of the support sheet 17 corresponding to the wired circuit board 3 in the third step.

[0090] The reinforcing substrate 4 includes the reinforcing base layer 13, the reinforcing conductor layer 14, and the reinforcing cover layer 15, but may include only one of the three layers, or may include only two of the three layers. Preferably, the reinforcing substrate 4 includes one to three layers including at least the reinforcing conductor layer 14. Specifically, the reinforcing substrate 4 may include one layer including only the reinforcing conductor layer 14, two layers including the reinforcing conductor layer 14 and the reinforcing base layer 13, two layers including the reinforcing conductor layer 14 and the reinforcing cover layer 15, or three layers including the reinforcing base layer 13, the reinforcing conductor layer 14, and the reinforcing cover layer 15. If the reinforcing substrate 4 includes at least the reinforcing conductor layer 14, the pressure-sensitive adhesive sheet 2 corresponding to the reinforcing substrate 4 can be further reinforced, and the wiring circuit board 3 can be more smoothly and reliably peeled off from the pressure-sensitive adhesive sheet 2.

[0091] Although not shown, the wired circuit board 1 with the adhesive sheet does not have to include the reinforcing substrate 4. Preferably, as in the first embodiment, the wired circuit board 1 with the adhesive sheet includes the reinforcing substrate 4. In the first embodiment, the adhesive sheet 2 corresponding to the reinforcing substrate 4 can be reinforced. Therefore, the wired circuit board 3 can be peeled off from the adhesive sheet 2 smoothly and reliably. [Second embodiment] In the second embodiment, the same reference numerals are used for the same components and steps as those in the first embodiment and its modified examples, and detailed descriptions thereof will be omitted. In addition, the second embodiment can achieve the same effects as those in the first embodiment and its modified examples, unless otherwise specified. Furthermore, the first embodiment, its modified examples, and the second embodiment can be appropriately combined.

[0092] In the second embodiment, as shown in Figures 7A and 7B, an adhesive sheet 2 is used as a second support sheet 18, and the first to third steps are performed in order, while the fourth and fifth steps of the first embodiment are not performed. [1st step] 2A, in the first step, in the second embodiment, as in the first embodiment, a base insulating layer 8, a conductor layer 9, and a cover insulating layer 10 are formed in order toward one thickness direction side on one thickness direction surface of a support sheet 17. In addition, a reinforcing base layer 13, a reinforcing conductor layer 14, and a reinforcing cover layer 15 are formed in order toward one thickness direction side on one thickness direction surface of the support sheet 17. In this way, a wired circuit board 3 and a reinforcing board 4 are simultaneously manufactured on one thickness direction surface of the support sheet 17. [Second process] 7A, the adhesive sheet 2 is brought into contact with one thickness-wise surface of the wiring circuit board 3 and the reinforcing substrate 4. Specifically, the other thickness-wise surface of the adhesive sheet 2 is adhered to one thickness-wise surface of the wiring circuit board 3 and the reinforcing substrate 4. [3rd step] In a third step, as shown in FIG. 7B, the support sheet 17 is removed.

[0093] Thus, the assembly includes the wired circuit board 3, the reinforcing substrate 4, and the adhesive sheet 2 on one surface of the wired circuit board 3 and the reinforcing substrate 4 in the thickness direction.

[0094] Thereafter, as shown in Fig. 7C, the wired circuit board 3 is peeled off from the adhesive sheet 2. Specifically, as shown by the arrow in Fig. 7C, the wired circuit board 3 moves to the other side in the thickness direction relative to the adhesive sheet 2.

[0095] (Effects of the second embodiment) In the second embodiment, as shown in Fig. 7A, the adhesive sheet 2 is adhered to the other surface in the thickness direction of the wiring circuit board 3, and then the support sheet 17 is removed as shown in Fig. 7B. Therefore, by separating the wiring circuit board 3 from the adhesive sheet 2, the wiring circuit board 3 without the above-mentioned pieces (offcuts) can be easily obtained. In addition, since the fourth and fifth steps are not performed, the number of steps can be reduced. Furthermore, since the second support sheet 18 is not used, the manufacturing cost can be reduced.

[0096] On the other hand, in the second embodiment, as shown in Fig. 7B, the adhesive sheet 2 adheres to one surface in the thickness direction of the wiring circuit board 3. Therefore, when the wiring circuit board 3 is peeled off from the adhesive sheet 2, adhesive residue may remain on one surface in the thickness direction of the terminals 12 (not shown in Fig. 7B), which may reduce the electrical connection reliability of the terminals 12. On the other hand, in the first embodiment, as shown in Fig. 2E, the adhesive sheet 2 adheres to the other surface in the thickness direction of the wiring circuit board 3. Therefore, even if adhesive residue remains on the other surface in the thickness direction of the base insulating layer 8 when the wiring circuit board 3 is peeled off from the adhesive sheet 2, the above-mentioned decrease in connection reliability of the terminals 12 (not shown in Fig. 2E) can be suppressed. [Third embodiment] In the third embodiment, the same reference numerals are used for the same members and steps as those in the first embodiment, its modified example, and the second embodiment, and detailed descriptions thereof will be omitted. In addition, the third embodiment can achieve the same effects as those in the first embodiment, its modified example, and the second embodiment, unless otherwise specified. Furthermore, the first embodiment, its modified example, the second embodiment, and the third embodiment can be appropriately combined.

[0097] 9H, the wired circuit board 3 is a wired circuit board with a metal support layer that further includes a metal support layer 20. This wired circuit board 3 includes the metal support layer 20, a base insulating layer 8, a conductor layer 9, and a cover insulating layer 10. The wired circuit board 3 preferably does not include an optical waveguide, and includes only the metal support layer 20, the base insulating layer 8, the conductor layer 9, and the cover insulating layer 10.

[0098] The metal support layer 20 is disposed on the other thickness-wise surface of the base insulating layer 8. The metal support layer 20 is included in the base insulating layer 8 in bottom view, and is smaller than the base insulating layer 8. Therefore, the metal support layer 20 exposes the peripheral end portion on the other thickness-wise surface of the base insulating layer 8. The metal support layer 20 forms the other thickness-wise surface of the wiring circuit board 3. Examples of materials for the metal support layer 20 include metals, and preferably stainless steel from the viewpoint of ensuring excellent toughness. The thickness of the metal support layer 20 is, for example, 5 μm or more and 100 μm or less.

[0099] The reinforcing substrate 4 further includes a reinforcing metal support layer 26. The reinforcing substrate 4 includes the reinforcing metal support layer 26, a reinforcing base layer 13, a reinforcing conductor layer 14, and a reinforcing cover layer 15.

[0100] The reinforcing metal support layer 26 is included in the reinforcing base layer 13 in a plan view. The reinforcing metal support layer 26 forms the other surface in the thickness direction of the reinforcing substrate 4. The inner end surface of the reinforcing metal support layer 26 that faces the metal support layer 20 is disposed outward from the inner end surface of the reinforcing base layer 13 that faces the base insulating layer 8 when projected in the thickness direction. The reinforcing metal support layer 26 is formed as the same layer as the metal support layer 20.

[0101] A method for producing a wired circuit board 1 with an adhesive sheet, which includes a metal supporting layer 20 and a reinforcing metal supporting layer 26, will be described with reference to FIG. 2A and FIGS. 8A to 9H.

[0102] In this method, the first to third steps are carried out in this order. [1st step] 2A, in the first step, similarly to the first step of the first embodiment, a base insulating layer 8, a conductor layer 9, and a cover insulating layer 10 are formed in order toward one thickness direction side on one thickness direction surface of a support sheet 17. At the same time, a reinforcing base layer 13, a reinforcing conductor layer 14, and a reinforcing cover layer 15 are formed in order toward one thickness direction side on one thickness direction surface of the support sheet 17. In this way, a wired circuit board 3 and a reinforcing board 4 are manufactured on one thickness direction surface of the support sheet 17.

[0103] In the first step, the support sheet 17 is preferably a metal plate, more preferably a stainless steel plate, for forming the metal support layer 20 and the reinforcing metal support layer 26. [Second process] In the second step, as in the second step of the second embodiment, the adhesive sheet 2 is brought into contact with one surface in the thickness direction of the wired circuit board 3 and the reinforcing substrate 4, as shown in FIG. 8D. [3rd step] In the third step, as shown in FIG. 9E, the portion of the support sheet 17 surrounding the wired circuit board 3 is removed. This exposes the isolated region 5 of the support sheet 17 toward the other side in the thickness direction. For example, the support sheet 17 is etched using an etching resist 24 (see FIG. 8A). The etching resist 24 has the same pattern as the metal support layer 20 and the reinforcing metal support layer 26. The etching resist 24 is formed by photolithography of the photoresist 21.

[0104] To form the etching resist 24, for example, first, after the first step and before the second step, two photoresists 21 are placed on the support sheet 17, the wired circuit board 3, and the reinforcing substrate 4, respectively, as shown in Fig. 8A. Specifically, the first photoresist 21A is placed on the other thickness-wise surface of the support sheet 17. The second photoresist 21B is placed on one thickness-wise surface of the wired circuit board 3 and the reinforcing substrate 4.

[0105] 8B, the first photoresist 21A is exposed to light through a photomask (not shown) by photolithography to form a latent image consisting of the portions to remain 22 and the portions to be removed 23. On the other hand, the second photoresist 21B is not exposed to light. Therefore, the second photoresist 21B becomes the portions to be removed 23. If the photoresist 21 is a negative type, the portions to remain 22 are exposed portions, and the portions to be removed 23 are unexposed portions.

[0106] Next, as shown in Fig. 8C, only the second photoresist 21B is removed by development. Specifically, the first photoresist 21A is left undeveloped, and the second photoresist 21B is removed by development. Then, in a third step, as shown in Fig. 8D, an adhesive sheet 2 is placed on one thickness-wise surface of the wiring circuit board 3 and the reinforcing substrate 4 on which the second photoresist 21B was placed.

[0107] 9E, the first photoresist 21A is developed to form an etching resist 24. In the development of the first photoresist 21A, the portions to be removed 23 are removed, and the portions to be left 22 remain to become the etching resist 24.

[0108] Thereafter, as shown in FIG. 9F, the support sheet 17 exposed from the etching resist 24 is etched to form the metal support layer 20 and the reinforcing metal support layer 26.

[0109] This results in the wired circuit board 3 and the reinforcing substrate 4 being supported on the other thickness-wise surface of the adhesive sheet 2. In other words, a wired circuit board 1 with an adhesive sheet is manufactured, which includes the wired circuit board 3, the reinforcing substrate 4, and the adhesive sheet 2 disposed on one thickness-wise surface of the wired circuit board 3 and the reinforcing substrate 4.

[0110] Thereafter, as shown by the arrow in FIG. 9H, wired circuit board 3 is moved toward the other side in the thickness direction relative to adhesive sheet 2, whereby wired circuit board 3 is peeled off from adhesive sheet 2.

[0111] (Effects of the third embodiment) In this wired circuit board 1 with an adhesive sheet and its manufacturing method, since the wired circuit board 3 further includes the metal supporting layer 20, it is possible to obtain a wired circuit board 3 with excellent toughness.

[0112] Furthermore, in this method, as shown in FIG. 9F, the portion of support sheet 17 surrounding wired circuit board 3 is removed, so that wired circuit board 3 can be reliably separated from the portion of support sheet 17 outside that portion. [Fourth embodiment] In the fourth embodiment, the same reference numerals are used for the same members and steps as those in the first embodiment, its modified example, the second embodiment, and the third embodiment, and detailed description thereof will be omitted. Furthermore, the first embodiment, its modified example, the second embodiment, and the third embodiment can achieve the same effects as those of the first embodiment, its modified example, the second embodiment, and the third embodiment, unless otherwise specified. Furthermore, the first embodiment, its modified example, and the second to fourth embodiments can be appropriately combined.

[0113] In the fourth embodiment, the wired circuit board 3 produced in the third embodiment and shown in FIG. 9G is transferred together with the reinforcing substrate 4 to a second adhesive sheet 25 as shown in FIGS. 10A and 10B (sixth step).

[0114] 10A, second adhesive sheet 25 is brought into contact with (adhered to) the other thickness-wise surfaces of wired circuit board 3 and reinforcing substrate 4. Second adhesive sheet 25 has a similar structure to adhesive sheet 2. However, the adhesive strength of second adhesive sheet 25 is greater than that of adhesive sheet 2.

[0115] Thereafter, as shown in FIG. 10B, adhesive sheet 2 is peeled off from one surface in the thickness direction of wired circuit board 3 and reinforcing substrate 4.

[0116] This results in the wired circuit board 3 and the reinforcing substrate 4 being supported on one thickness-wise surface of the second adhesive sheet 25. In other words, a wired circuit board 1 with an adhesive sheet is manufactured, which includes the wired circuit board 3, the reinforcing substrate 4, and the second adhesive sheet 25 disposed on the other thickness-wise surface thereof.

[0117] As indicated by the imaginary lines and arrows in FIG. 10B, wired circuit board 3 is moved toward one side in the thickness direction relative to second adhesive sheet 25, whereby wired circuit board 3 is peeled off from second adhesive sheet 25.

[0118] (Functions and Effects of the Fourth Embodiment) In this method, in the sixth step, the wired circuit board 3 is transferred from the adhesive sheet 2 to the second adhesive sheet 25. Therefore, by separating the wired circuit board 3 from the second adhesive sheet 25 as shown by the imaginary line and arrow in FIG. 10B, a wired circuit board 3 that does not have the above-mentioned pieces (cut pieces) can be easily obtained.

[0119] In the third embodiment, as shown in Fig. 9G, the wiring circuit board 3 (cover insulating layer 10) is adhered to the other surface in the thickness direction of the adhesive sheet 2, and then the wiring circuit board 3 is moved to the other side in the thickness direction to obtain the wiring circuit board 3. In contrast, in the fourth embodiment, the wiring circuit board 3 (metal support layer 20) is adhered to one surface in the thickness direction of the adhesive sheet 2, and then the wiring circuit board 3 is moved to one side in the thickness direction to obtain the wiring circuit board 3. Therefore, the third or fourth embodiment is appropriately selected depending on the usage situation of the wiring circuit board 3, with regard to whether the wiring circuit board 3 is adhered to one surface or the other surface in the thickness direction of the adhesive sheet 2, or whether the wiring circuit board 3 is moved to one side or the other side in the thickness direction. [Explanation of symbols]

[0120] 1 Wiring circuit board with adhesive sheet 2 Adhesive Sheet 3 Wiring circuit board 4 Reinforcement substrate 7 Reinforcement substrate 8 Base insulation layer 9 Conductor Layer 10 Cover insulation layer 14 Reinforcing conductor layer 17 Support Sheet 18 Second Support Sheet 20 Metal support layer 25 Second adhesive sheet L Length (wiring circuit board)

Claims

1. a wired circuit board including a base insulating layer, a conductor layer disposed on one surface in a thickness direction of the base insulating layer, and a cover insulating layer disposed on the one surface in the thickness direction of the base insulating layer so as to cover the conductor layer; a reinforcing substrate surrounding the entire outer peripheral surface of the wiring circuit board at a distance in a plane direction perpendicular to the thickness direction of the wiring circuit board; an adhesive sheet disposed on either one surface or the other surface of the wiring circuit board in a thickness direction; Equipped with the pressure-sensitive adhesive sheet includes the wiring circuit board and the reinforcing substrate when projected in the thickness direction, is continuous in the plane direction, and is disposed on a surface of the reinforcing substrate on the same side as one of the surfaces on one and the other sides in the thickness direction of the wiring circuit board; a width of an isolation region, which is a distance between an outer peripheral surface of the wired circuit board and an inner peripheral surface of the reinforcing substrate, is 10 μm or more and 2000 μm or less; The reinforcing substrate includes a reinforcing conductor layer.

2. The wired circuit board with an adhesive sheet according to claim 1 , wherein the wired circuit board has a length of 300 mm or more.

3. The adhesive layer according to claim 1 , wherein the reinforcing conductor layer has a generally lattice shape in a plan view. Wiring circuit board with adhesive sheet.

4. The wired circuit board with adhesive sheet according to any one of claims 1 to 3, further comprising a metal support layer disposed on the other surface in the thickness direction of the base insulating layer.

5. a first step of forming a base insulating layer, a conductor layer, and a cover insulating layer in this order toward one side in the thickness direction on one surface of a support sheet in the thickness direction to form a wiring circuit board on the one surface of the support sheet in the thickness direction, and forming a reinforcing substrate on the one surface of the support sheet in the thickness direction so as to surround the entire outer periphery of the wiring circuit board at a distance therefrom; a second step of contacting a second support sheet with one surface in the thickness direction of the wired circuit board and contacting the second support sheet with one surface in the thickness direction of the reinforcing substrate; a third step of removing a portion of the support sheet corresponding to the wired circuit board; Equipped with 2. A method for producing a wired circuit board with an adhesive sheet, wherein the reinforcing substrate includes a reinforcing conductor layer.

6. In the third step, the support sheet is removed, a fourth step of adhering an adhesive sheet to the other surface in the thickness direction of the wired circuit board after the third step; a fifth step of removing the second support sheet after the fourth step; The method for producing a wired circuit board with an adhesive sheet according to claim 5 , further comprising:

7. A sixth step of transferring the wiring circuit board from the adhesive sheet to a second adhesive sheet. The method for producing a wired circuit board with an adhesive sheet according to claim 6, further comprising:

8. The method for producing a wired circuit board with an adhesive sheet according to claim 5 , wherein the second support sheet is an adhesive sheet.

9. 9. The method for producing a wired circuit board with an adhesive sheet according to claim 5, wherein in the third step, a portion of the support sheet surrounding the wired circuit board is removed.

10. The support sheet is a metal sheet, 9. The method for producing a wired circuit board with an adhesive sheet according to claim 8, wherein in the third step, a metal support layer is formed from the metal sheet, the metal support layer being disposed on the other surface in the thickness direction of the base insulating layer.

11. The method for producing a wired circuit board with an adhesive sheet according to any one of claims 5 to 10, wherein the wired circuit board has a length of 300 mm or more.

Images