CN2842988Y

CN2842988Y - Flexible circuit-board

Info

Publication number: CN2842988Y
Application number: CN 200520036306
Authority: CN
Inventors: 帅羽
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2005-11-22
Filing date: 2005-11-22
Publication date: 2006-11-29
Anticipated expiration: 2015-11-22

Abstract

The utility model discloses a flexible circuit board. The utility model comprises wires which are distributed on the utility model, wherein the thinnest wire is arranged in the middle of the flexible circuit board, the wires of which the diameter is gradually enlarged are respectively distributed from the middle to both side hems; the wires between the two hem wires are uniformly distributed; the distance between the wires arranged on the utmost outer side and the adjacent wires is larger than the distance between the other adjacent wires. When the flexible circuit board is bent, the both side hems are provided with the thickest wires; in this way, the stress of the entire dynamic region is relatively uniform, the stress generated in the process of bending can be efficiently dispersed, and thus the phenomena of stress concentration, fissuration or damage, etc. because of nonuniform stress can be avoided.

Description

A kind of flexible circuit board

Technical field

The utility model relates to a kind of flexible circuit board, especially is applicable to the flexible circuit board of slide phone.

Background technology

Development of Communication Technique, mobile phone have become the indispensable part of people's daily life, and people require constantly to increase to the personalization of mobile phone, and slide phone comes out thereupon.But, being subjected to the influence of crooked process radius, the difference of wiring is determining the bending number of times and the useful life of slide phone.

In general, the factor that influences the mobile phone bending has: material, the wiring in crooked process radius and bending zone.Wherein, the specification of material is fixed, and selects the bending effect that can obtain by corresponding thickness requirement collocation; Because slide phone is the design of washboard-type, crooked process radius is between 1.5mm-2.0mm; Take the mode of random arrangement under the prerequisite of the general electric property that is routed in the installation requirement that satisfies components and parts and product, problem such as this wire laying mode will cause wiring board bending number of times few, and the life-span is low, and distribution of resistance is inhomogeneous.

Summary of the invention

The purpose of this utility model is exactly in order to overcome the above problems, and a kind of flexible circuit board is provided.

The utility model realizes that the above-mentioned purpose scheme is: a kind of flexible circuit board, comprise distribution line thereon, and wherein, the thinnest line places the centre of flexible circuit board, lays the line that the line footpath increases gradually respectively to both sides of the edge from the centre.

Each line between the line of two edges evenly distributes.

Outermost line is adjacent distance between the line greater than the distance between other each adjacent lines.

Adopt the beneficial effect of above scheme:

Flexible print circuit board of the present utility model is in bending, because both sides of the edge are the thickest line, whole like this dynamic area is stressed more even, the stress that produces in the bending process can effectively disperse, and avoids that circuit is concentrated because of stress appears in unbalance stress, phenomenons such as be full of cracks or damage.By the test result of table one as can be known, adopt the bending number of times of the flexible circuit board that the technical solution of the utility model obtains significantly to increase, the bending of flexible circuit board is higher, longer service life.

Description of drawings

Also in conjunction with the accompanying drawings the utility model is described in further detail below by specific embodiment.

Fig. 1 is a double-faced flexible circuit board structure schematic diagram.

Fig. 2 is the wiring schematic diagram of the utility model embodiment.

Fig. 3 is the wiring schematic diagram of the utility model comparative example.

Embodiment

A kind of flexible circuit board, as shown in Figure 2, the thinnest line places the centre of flexible circuit board, lays the line that the line footpath increases gradually respectively to both sides of the edge from the centre.Described line comprises shielding conductor, performance line etc.

Each line between the line of two edges evenly distributes.Concrete distance between each line determines according to the size of flexible circuit board, preferably satisfies outermost line and is adjacent distance between the line greater than the distance between other each adjacent lines.

Embodiment, as shown in Figure 1, flexible circuit board; in the present embodiment; flexible circuit board is the double-faced flexible wiring board, and it comprises base film 10, last Copper Foil 21, following Copper Foil 22, upper protective film 31, following diaphragm 32 and adhesive 40, and described adhesive 40 is a prepreg.

Wherein, base film 10 is polyimides (PI) film or PETG (PET) the film formation of 5 ~ 50 μ m by thickness;

Copper Foil

21,22 up and down, are that rolled copper foil or the electrolytic copper foil of 5 ~ 50 μ m formed by thickness, and last Copper Foil 21 is bonded in base film 10 tops by adhesive 40, and following Copper Foil 22 is bonded in base film 10 belows by adhesive 40;

Diaphragm

31,32 up and down; diaphragm is called epiphragma again, is that PI film or the PET film of 5 ~ 50 μ m formed by thickness, and upper protective film 31 is bonded in Copper Foil 21 tops by adhesive 40; following diaphragm 32 is bonded in down Copper Foil 22 belows by adhesive 40, realizes strong bonded by hot pressing.

As shown in Figure 2, use two-sided Copper Foil, wherein the thickness of copper is 18um, the thickness of PI is 15um, the film made from wire laying mode of the present utility model after the copper facing exposes on Copper Foil and forms circuit, develops, and presses turmeric after two sides epiphragma and the hot pressing after the etching, stick stiffener and gummed paper again, go out the profile of product at last by the profile mould according to design requirement.Wherein wire laying mode be with line directly for the line cloth of 4mm in the flexible circuit board two edges, line directly is evenly distributed between the two edges for the line of 0.1mm.The flexible circuitry panel products is tested on the simulation Flexing Apparatus with the crooked process radius of 1.5mm and the stroke of 32.5mm, and as shown in Table 1, its bending number of times altogether is 83236 times.

Comparative example, as shown in Figure 3, use two-sided Copper Foil, wherein the thickness of copper is 18um, and the thickness of PI is 15um, and the film made from existing wire laying mode after the copper facing exposes on Copper Foil and forms circuit, develop, press turmeric after two sides epiphragma and the hot pressing after the etching, stick stiffener and gummed paper again, go out the profile of product at last by the profile mould according to design requirement.Wherein wire laying mode is a random arrangement, and line footpath line-spacing is decided according to whole wiring board width, does not have fixed numbers.To the crooked process radius of flexible circuitry panel products with 1.5mm, 32.5mm stroke on the simulation Flexing Apparatus identical, test with embodiment, as shown in Table 1, its bending number of times altogether is 53954, so the bending number of times that adopts the flexible circuit board of scheme of the present utility model is far longer than the bending number of times of the flexible circuit board of the wire laying mode that adopts prior art, improve the bending of flexible circuit board greatly, and prolonged its useful life.

	The bending number of times	Resistance (m Ω)
	The bending number of times	Resistance (m Ω)	Method of testing	IPC bends test machine	4 resistance meters
Embodiment	83236 times	20	Method of testing	IPC bends test machine	4 resistance meters
Embodiment	83236 times	20	Comparative example	53954 times	35

The bending test result record of table one embodiment and comparative example

Claims

1, a kind of flexible circuit board comprises distribution line thereon, it is characterized in that: wherein, the thinnest line places the centre of flexible circuit board, lays the line that the line footpath increases gradually respectively to both sides of the edge from the centre.

2, flexible circuit board according to claim 1 is characterized in that: each line between the line of two edges evenly distributes.

3, flexible circuit board according to claim 1 and 2 is characterized in that: outermost line is adjacent distance between the line greater than the distance between other each adjacent lines.