Tensile flexible circuit board

Abstract

The utility model discloses a tensile flexible circuit board, which belongs to the technical field of flexible circuit boards, and comprises a flexible circuit board main body used for signal transmission and power supply, the flexible circuit board main body comprises a conductive layer and an insulating base material layer, and the conductive layer is installed on the upper surface of the insulating base material layer through a hot pressing process; the reinforcing ribs are bonded on the lower surface of the insulating base material layer through the glue layer, the structure is simple, convenience and practicability are achieved, the tensile property of the flexible circuit board body can be improved, the reinforcing pieces are bonded at the corners of the side faces of the insulating base material layer, the flexible circuit board body can be prevented from being torn from the corners, the tensile property of the device is further improved, and the service life of the device is prolonged. And the bottom and the side edge of the insulating substrate layer are only partially reinforced, so that the overall size and weight are not greatly influenced, the device is relatively light and thin, and is convenient to use and process, and the use cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to flexible circuit board technical field, concretely is a kind of tensile flexible circuit board. BACKGROUND

[0002] Flexible circuit board is the technology that the United States developed in the 70s of last century for developing space rocket technology, is a kind of printed circuit with high reliability, excellent flexure, which is made of polyester film or polyimide substrate, by embedding circuit design on bendable thin plastic sheet, a large number of precision components are embedded in narrow and limited space, to form bendable flexible circuit. This kind of circuit can be bent, folded, light in weight, small in size, good in heat dissipation, easy to install, and breaks through the traditional interconnection technology. In the structure of flexible circuit, the material is insulating film, conductor and adhesive.

[0003] Through the search, in the prior art, Chinese patent publication number: CN219313490U discloses a kind of flexible circuit board, it is related to circuit board technical field, including first connecting part, the first connecting part one end fixed mounting has bending part, the bending part one end is fixed with second connecting part, the surface of the bending part is fixedly installed with connecting line, the both ends of the connecting line are fixedly installed with gold finger, the surface of the first connecting part and second connecting part is fixedly installed with first velcro. In the utility model, in the process of transporting flexible circuit board, the second velcro on the protection plate can be pressed against the first velcro, at this time, the first velcro and the second velcro are mutually adhered, at this time, the protection plate can be fixed, so that in the process of transporting flexible circuit board, gold finger can be prevented from being damaged due to friction, reduce the transportation loss of flexible circuit board, while after transportation, protection plate can be recycled in batches, reduce cost, and practicality is higher.

[0004] But the device still has the following defects:

[0005] Flexible circuit board has the characteristics of light and thin, soft, which also leads to the disadvantage that flexible circuit board is easy to be torn, at present, many flexible circuit boards are connected by the way of ribbon cable insertion with buckle or the way of gold finger direct insertion, in the process of installation and maintenance of flexible circuit board, accidental pulling to flexible circuit board may occur, leading to the loss of flexible circuit board being torn, the device does not solve this problem. UTILITY MODEL CONTENTS

[0006] The utility model discloses a purpose lies in providing a kind of tensile flexible circuit board, by adhesive layer bonding stiffener on the lower surface of insulating substrate layer, the tensile performance of flexible circuit board main body can be improved, and by bonding reinforcing patch at the corner of insulating substrate layer side, the flexible circuit board main body can be prevented from being torn from corner, further improve the tensile performance of the device, compared with prior art more light and thin, convenient to use, while being convenient for processing, reduce use cost, to solve the problems in the above background art.

[0007] To achieve the above object, the utility model provides the following technical scheme:

[0008] A kind of tensile flexible circuit board, including the flexible circuit board main body for signal transmission and power supply, the flexible circuit board main body includes conductive layer and insulating substrate layer, the conductive layer is installed on the upper surface of insulating substrate layer by hot-pressing process;

[0009] It further includes stiffening component for improving the tensile performance of flexible circuit board main body, the stiffening component includes multiple groups of stiffener and reinforcing patch, the stiffener is arranged on the lower surface of insulating substrate layer, and the reinforcing patch is bonded on the corner of insulating substrate layer by adhesive.

[0010] Preferably, the lower surface of the insulating substrate layer is coated with a layer of adhesive, and the stiffener is bonded to the lower surface of the insulating substrate layer through the adhesive layer.

[0011] Preferably, the stiffener includes multiple groups of metal fibers, and the metal fibers are intertwined in a spiral shape.

[0012] Preferably, the conductive layer is made of copper foil, and the surface of the conductive layer is provided with circuit patterns by etching process.

[0013] Preferably, the flexible circuit board main body further includes an insulating surface layer, the insulating surface layer is coated on the surface of the insulating substrate layer, and the conductive layer is arranged between the insulating substrate layer and the insulating surface layer.

[0014] Preferably, the flexible circuit board main body further includes a gold finger, the bottom of the gold finger is welded to the conductive layer, and the top of the gold finger is arranged above the insulating surface layer.

[0015] Preferably, the corner of the insulating substrate layer is provided with a reinforcing part, and the reinforcing part is integrally formed with the insulating substrate layer.

[0016] Preferably, a plurality of positioning installation holes are formed around the surface of the insulating substrate layer, and the corresponding positions of the insulating surface layer and the adhesive layer are provided with the same positioning installation holes.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The utility model discloses a flexible circuit board main body through the adhesive layer bonding stiffener on the lower surface of insulating base material layer, simple structure, convenient and practical can improve the tensile property of flexible circuit board main body, and through the adhesive reinforcing piece of insulating base material layer side corner, can prevent flexible circuit board main body from tearing from the corner, further improved the tensile property of the device, and the device only made the strengthening of the bottom and the side edge partial of insulating base material layer to the volume and weight of whole has no greater influence, make the device be light and thin, convenient to use, process simultaneously, reduced use cost. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 It is the structure schematic diagram of the utility model;

[0020] Fig. 2 It is the explosion separation structure schematic diagram of the utility model;

[0021] Fig. 3 It is the structure schematic diagram of insulating base material layer;

[0022] Fig. 4 It is the structure schematic diagram of stiffener.

[0023] In the drawing: 1, flexible circuit board main body;101, conductive layer;102, insulating base material layer;103, insulating surface layer;104, gold finger;105, strengthening portion;2, stiffener;201, metal fiber;3, reinforcing piece;4, adhesive layer;5, positioning mounting hole. DETAILED DESCRIPTION

[0024] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor are within the protection scope of the utility model.

[0025] Please refer to Figs. 1-4 The utility model provides a technical scheme:

[0026] A kind of tensile flexible circuit board, including flexible circuit board body 1 for signal transmission and power supply, flexible circuit board body 1 includes conductive layer 101 and insulating substrate layer 102, insulating substrate layer 102 is made of polyimide material, conductive layer 101 is installed on the upper surface of insulating substrate layer 102 by hot-pressing process, conductive layer 101 is made of copper foil, copper foil is calendered copper foil, the surface of conductive layer 101 is provided with circuit pattern using etching process, flexible circuit board body 1 also includes insulating surface layer 103, insulating surface layer 103 is coated on the surface of insulating substrate layer 102, conductive layer 101 is arranged between insulating substrate layer 102 and insulating surface layer 103, flexible circuit board body 1 also includes gold finger 104, the bottom of gold finger 104 is welded to conductive layer 101, and the top of gold finger 104 is arranged above insulating surface layer 103.

[0027] By setting flexible circuit board body 1, it can be bent, folded, wound, and can be arbitrarily moved and stretched in three-dimensional space, so as to adapt to the design requirements of electronic products of different shapes and space limitations, compared with traditional rigid circuit board, flexible circuit board is thinner and lighter, which helps to reduce the volume and weight of electronic products, improve the portability of products, and by using polyimide material to make insulating substrate layer 102, the overall tensile performance of flexible circuit board body 1 can be effectively improved due to the high tensile strength and heat resistance of polyimide material itself, and by using calendered copper foil, it has good flexibility and tensile strength, and has better tensile resistance than electrolytic copper foil, and by setting insulating surface layer 103, the circuit can be protected from the influence of external environment.

[0028] The corner of the insulating substrate layer 102 is provided with a reinforcing part 105, and the reinforcing part 105 is integrally formed with the insulating substrate layer 102.

[0029] By setting the reinforcing part 105, the acute angle or right angle at the corner of the insulating substrate layer 102 can be changed to an obtuse angle, which can effectively reduce stress concentration and reduce the risk of fracture of the insulating substrate layer 102 from the corner, and by setting the positioning mounting hole 5, the flexible circuit board body 1 can be fixed on the shell of the equipment or other structure, to ensure the stability and reliability of the flexible circuit board body 1 during use, and through these positioning mounting holes 5, screws, rivets and other fasteners can be used to fix the flexible circuit board body 1 in the required position.

[0030] The reinforcing assembly also includes a plurality of reinforcing pieces 3, which are adhered to the reinforcing portions 105 at the corners of the insulating substrate layer 102 by glue.

[0031] The flexible circuit board body 1 may be subjected to various external tensile forces during use, such as pulling during installation, vibration during device operation, etc. By adhering the reinforcing ribs 2 to the lower surface of the insulating substrate layer 102 through the glue layer 4, additional tensile strength can be provided to prevent the flexible circuit board body 1 from deforming or breaking under tension. When the flexible circuit board body 1 needs to be bent or folded in a narrow space, the reinforcing ribs 2 can increase the rigidity of the bending portion, reduce the bending stress, and improve the bending resistance of the circuit board. For some flexible circuit board bodies 1 that need to be stacked and installed, the reinforcing ribs 2 can provide support to prevent the upper flexible circuit board body 1 from exerting excessive pressure on the lower flexible circuit board body 1, thereby improving the stability and reliability of the entire flexible circuit board body 1 assembly. By using metal fibers 201 that are intertwined in a spiral shape, the stress can be dispersed along the spiral line to the entire reinforcing rib 2 when subjected to tension, avoiding local stress concentration and thereby improving the tensile strength of the reinforcing rib 2. When the reinforcing rib 2 is subjected to uneven tension, the spiral structure can redistribute the stress between different spiral turns, making the overall stress on the reinforcing rib 2 more uniform. For a reinforcing rib 2 composed of multiple metal fibers 201, spiral winding can increase the friction and cohesion between the metal fibers 201, which are intertwined and pressed against each other, making them less likely to slide and separate under stress, thereby improving the overall strength of the reinforcing rib 2.

[0032] The reinforcing assembly also includes a plurality of reinforcing pieces 3, which are adhered to the reinforcing portions 105 at the corners of the insulating substrate layer 102 by glue.

[0033] The flexible circuit board body 1 itself is relatively soft, and the reinforcing pieces 3 can increase the rigidity of specific portions to prevent deformation when subjected to bending forces, reducing problems such as circuit breakage or poor connection caused by bending. For flexible circuit board bodies 1 that need to be bent multiple times in a narrow space, the reinforcing pieces 3 can ensure that they maintain a stable shape during bending, avoiding damage from excessive bending. The corners of the flexible circuit board body 1 are prone to pulling forces, and the reinforcing pieces 3 can share some of the tension to prevent the corners of the flexible circuit board body 1 from breaking due to excessive tension. During the manufacturing process of the flexible circuit board body 1, the reinforcing pieces 3 can increase the rigidity of the flexible circuit board body 1, making it easier to process and assemble.

[0034] In the description, unless otherwise explicitly specified and limited, the terms "mounting", "setting", "connecting", "fixing", "screwing" and other terms should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise explicitly limited, the specific meaning of the above terms can be understood according to the specific circumstances by those skilled in the art.

[0035] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A tensile-resistant flexible circuit board, characterized in that, include: A flexible circuit board body (1) for signal transmission and power supply, the flexible circuit board body (1) includes a conductive layer (101) and an insulating substrate layer (102), the conductive layer (101) is installed on the upper surface of the insulating substrate layer (102) by a hot pressing process; It also includes a reinforcing component for improving the tensile strength of the flexible circuit board body (1), the reinforcing component including multiple sets of reinforcing ribs (2) and reinforcing sheets (3), the reinforcing ribs (2) being disposed on the lower surface of the insulating substrate layer (102), and the reinforcing sheets (3) being bonded to the corners of the insulating substrate layer (102) by adhesive.

2. The tensile-resistant flexible circuit board according to claim 1, characterized in that: The lower surface of the insulating substrate layer (102) is coated with an adhesive layer (4), and the reinforcing rib (2) is bonded to the lower surface of the insulating substrate layer (102) through the adhesive layer (4).

3. The tensile-resistant flexible circuit board according to claim 2, characterized in that: The reinforcing rib (2) includes multiple sets of metal fibers (201), which are intertwined in a spiral shape.

4. The tensile-resistant flexible circuit board according to claim 1, characterized in that: The conductive layer (101) is made of copper foil, and the surface of the conductive layer (101) is etched with circuit patterns.

5. A tensile-resistant flexible circuit board according to claim 2, characterized in that: The flexible circuit board body (1) further includes an insulating surface layer (103), which is coated on the surface of the insulating substrate layer (102), and the conductive layer (101) is disposed between the insulating substrate layer (102) and the insulating surface layer (103).

6. A tensile-resistant flexible circuit board according to claim 1, characterized in that: The flexible circuit board body (1) also includes gold fingers (104), the bottom of which is soldered to the conductive layer (101), and the top of which is disposed above the insulating surface layer (103).

7. A tensile-resistant flexible circuit board according to claim 1, characterized in that: A reinforcing part (105) is provided at the corner of the insulating substrate layer (102), and the reinforcing part (105) is integrally formed with the insulating substrate layer (102).

8. A tensile-resistant flexible circuit board according to claim 5, characterized in that: The insulating substrate layer (102) has positioning and mounting holes (5) around its surface, and the insulating surface layer (103) and the adhesive layer (4) have the same positioning and mounting holes (5) at their corresponding positions.

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