CN220489985U

CN220489985U - Device for detecting warpage of flexible circuit board

Info

Publication number: CN220489985U
Application number: CN202322008563.2U
Authority: CN
Inventors: 朱创民; 吕昶; 陈超一; 汤晨; 康伟; 林智聪
Original assignee: BOE Technology Group Co Ltd; Hefei Xinsheng Optoelectronics Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Hefei Xinsheng Optoelectronics Technology Co Ltd
Priority date: 2023-07-26
Filing date: 2023-07-26
Publication date: 2024-02-13
Anticipated expiration: 2033-07-26

Abstract

The application provides a device for detecting flexible circuit board warpage, the device includes: a fixing structure for fixing one side of a flexible circuit board so that the flexible circuit board extends from the fixing structure in a direction away from the fixing structure; the light source assembly is arranged on one side of the fixing structure, which is used for fixing the flexible circuit board, and comprises a light source emitting end and a light source receiving end, wherein the light source emitting end is used for emitting light, the light source receiving end is used for receiving the light, the propagation direction of the light is perpendicular to the extending direction of the flexible circuit board, the orthographic projection of the light in the plane where the flexible circuit board is located is positioned in the orthographic projection of the flexible circuit board in the plane, and the distance between the light and the plane in the direction perpendicular to the plane is smaller than a preset distance.

Description

Device for detecting warpage of flexible circuit board

Technical Field

The application relates to the technical field of detection, in particular to a device for detecting the warpage of a flexible circuit board.

Background

The flexible circuit board (Flexible Printed Circuit, abbreviated as FPC) is a flexible printed circuit board which is made of polyimide or polyester film as a base material and has the characteristics of high reliability, excellent flexibility, high wiring density, light weight, thin thickness and good flexibility.

Typically, the FPC protrudes from a printed circuit board (Printed Circuit Board Assembly, abbreviated as PCB) and assumes a natural stretched state. However, in actual production, the FPC may be warped to different degrees due to environmental factors such as heat, and if the warpage is too large, a problem of poor connection of devices may be caused during Bonding (Bonding). Therefore, the degree of warpage of the FPC needs to be strictly controlled.

The traditional measurement mode of the warping degree of the FPC mainly comprises the step of measuring the warping position by using a coordinate ruler by a measurer. The measurement mode can possibly bring the problems of low measurement accuracy, low measurement efficiency, damage to the PCB and the like.

Disclosure of Invention

In view of this, the present application proposes a device for detecting warpage of a flexible circuit board, so as to solve or partially solve the above-mentioned problems.

The application provides a device for detecting flexible circuit board warpage, the device includes:

a fixing structure for fixing one side of a flexible circuit board so that the flexible circuit board extends from the fixing structure in a direction away from the fixing structure;

the light source assembly is arranged on one side of the fixing structure, which is used for fixing the flexible circuit board, and comprises a light source emitting end and a light source receiving end, wherein the light source emitting end is used for emitting light, the light source receiving end is used for receiving the light, the propagation direction of the light is perpendicular to the extending direction of the flexible circuit board, the orthographic projection of the light in the plane where the flexible circuit board is located is positioned in the orthographic projection of the flexible circuit board in the plane, and the distance between the light and the plane in the direction perpendicular to the plane is smaller than a preset distance.

In some embodiments, a printed circuit board is connected to one side of the flexible circuit board, and the fixing structure includes:

the fixed base is provided with a positioning groove for placing the printed circuit board;

and the fixed cover plate is matched with at least the part of the fixed base, which is provided with the positioning groove, so as to fix the printed circuit board placed in the positioning groove.

In some embodiments, the flexible circuit board is provided with an opening; the fixing structure further includes:

and the fixing pin is arranged on the fixing base and/or the fixing cover plate and is used for being clamped with the opening so as to limit the flexible circuit board.

In some embodiments, the apparatus further comprises:

the first magnetic component is arranged on one surface of the fixed cover plate, which faces the fixed base;

the second magnetic component is arranged on one surface of the fixed base corresponding to the first magnetic component, which faces the fixed cover plate;

the first magnetic component and the second magnetic component are fixed through magnetic attraction, so that the fixed cover plate and the fixed base are fixed.

In some embodiments, one of the first magnetic member and the second magnetic member has a magnetic attraction hole, and the other of the first magnetic member and the second magnetic member has a magnetic attraction protrusion that mates with the magnetic attraction hole.

In some embodiments, the apparatus further comprises:

the first connecting part is arranged at one end of the fixed cover plate far away from the extending direction of the flexible circuit board;

the second connecting part is arranged at one end, away from the extending direction of the flexible circuit board, of the fixed base corresponding to the first connecting part;

the first connecting part and the second connecting part are fixed through a rotating shaft so that the fixed cover plate is rotationally connected with the fixed base.

In some embodiments, the first and second connection parts are each provided with a rotation shaft hole through which a rotation shaft passes, and the first and second connection parts are fixed by the rotation shaft passing through the rotation shaft holes of both.

In some embodiments, the printed circuit board is provided with a driving chip, and the fixing cover plate includes a groove disposed toward an extending direction of the flexible circuit board, and the groove is used for exposing the driving chip when the fixing cover plate is fixed on the fixing base.

In some embodiments, the fixing cover plate is provided with a plurality of grooves side by side, and a pressing component is arranged between adjacent grooves and is used for pressing on the flexible circuit board to fix the flexible circuit board.

In some embodiments, the stationary base comprises: the light source comprises a first protruding part and a second protruding part protruding outwards along the extending direction, wherein the first protruding part and the second protruding part are positioned on two sides of the flexible circuit board perpendicular to the extending direction, the light source emitting end is arranged on one surface of the first protruding part, which faces the flexible circuit board, and the light source receiving end is arranged on one surface of the second protruding part, which faces the flexible circuit board.

In some embodiments, the light source emitting end includes a first light source and a second light source; the light source receiving end comprises a first receiving end and a second receiving end;

the first light source emits first light, and the first receiving end corresponds to the first light source to receive the first light;

the second light source emits second light, and the second receiving end corresponds to the second light source to receive the second light.

In some embodiments, the first distance between the first light and the plane of the flexible circuit board and the second distance between the second light and the plane of the flexible circuit board are both smaller than the predetermined distance.

In some embodiments, the first distance is not less than the second distance.

In some embodiments, the first light source and the second light source include at least one of a point light source, a line light source, and a surface light source.

In some embodiments, the light emitted by the light source emitting end is a laser.

In some embodiments, the flexible circuit board includes a binding region, and the orthographic projection of the light ray in the plane of the flexible circuit board at least partially overlaps with the orthographic projection of the binding region in the plane.

In some embodiments, the first distance is sized according to a detection target of the flexible circuit board.

The application provides a device for detecting flexible circuit board warpage, include: a fixing structure for fixing one side of the flexible circuit board so that the flexible circuit board extends from the fixing structure in a direction away from the fixing structure; the light source assembly is arranged on one side of the fixing structure, used for fixing the flexible circuit board, and comprises a light source emitting end and a light source receiving end, wherein the light source emitting end is used for emitting light, the light source receiving end is used for receiving the light, the propagation direction of the light is perpendicular to the extending direction of the flexible circuit board, the orthographic projection of the light in the plane where the flexible circuit board is located is positioned in the orthographic projection of the flexible circuit board in the plane, and the distance between the light and the plane in the direction perpendicular to the plane is smaller than the preset distance. This application is fixed flexible circuit board through with fixed knot constructs, can prevent effectively that flexible circuit board from shifting and turning, further carries out the transmission and the receipt of light through setting up the light source transmitting terminal and the light source receiving terminal at the light source subassembly at unable adjustment base both ends, whether the warpage degree of flexible circuit board exceeds the specification through the route and the light source receiving terminal facula appearance quick determination of light, has greatly improved detection efficiency. By using the optical line measurement, the scrapping of the whole circuit board caused by the fact that a measurer or a hard object touches a welding spot area on a binding area at the front end of the flexible circuit board can be avoided. The device can realize nondestructive testing of the warping degree of the flexible circuit board, and solves the problems of non-uniform reading line of sight, slow measuring efficiency and FPC damage caused by hard touch of personnel during measurement of the traditional coordinate ruler.

Drawings

In order to more clearly illustrate the technical solutions of the present application or the prior art, the following description will briefly introduce the drawings that are needed in the embodiments or the prior art descriptions, it being obvious that the drawings in the following description are only the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 shows a schematic diagram of an exemplary liquid crystal display device 100.

Fig. 2 shows a schematic structural diagram of an apparatus 200 for detecting warpage of a flexible circuit board according to an embodiment of the present application.

Fig. 3 shows a schematic structural diagram of the positioning base 211 according to an embodiment of the present application.

Fig. 4 shows a schematic structural diagram of the positioning cover plate 212 according to an embodiment of the present application.

Fig. 5 (a) shows a schematic structural diagram of a light source assembly 220 according to an embodiment of the present application.

Fig. 5 (B) is a schematic diagram illustrating details of the light source receiving end 222 according to an embodiment of the present application.

Fig. 6 (a) shows a schematic structural diagram of another light source assembly 220 according to an embodiment of the present application.

Fig. 6 (B) shows a detailed schematic diagram of another light source receiving end 224 according to an embodiment of the present application.

Reference numerals illustrate:

100-liquid crystal display device, 110-display module, 120-flexible circuit board, 130-printed circuit board, 200-device for detecting warpage of flexible circuit board, 210-fixed structure, 211-fixed base, 212-fixed cover plate, 220-light source assembly, 221-light source emitting end, 2211-first light source, 2212-second light source, 2111-positioning groove, 120-flexible circuit board, 130-printed circuit board, 2112-fixed pin, 2113-second magnetic member, 2121-first magnetic member, 222-light source receiving end, 2122-groove, 2123-press-fastening member, 2221-first receiving end, 2222-second receiving end, 223-point light source, 2231-third light source, 2232-fourth light source, 224-light source receiving end (point light source), 2241-third receiving end, 2242-fourth receiving end.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail below with reference to the accompanying drawings.

It should be noted that unless otherwise defined, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

Currently, with the development of liquid crystal display technology, a liquid crystal display module (Liquid Crystal Module, LCM for short) has been widely used in electronic products such as mobile phones and tablet computers.

As shown in fig. 1, the liquid crystal display device 100 includes a liquid crystal display module 110 and a control circuit for controlling the liquid crystal display module 110. The control circuit may be disposed on the printed circuit board 130, and the printed circuit board 130 may be electrically coupled with the liquid crystal display module 110 through the flexible circuit board 120.

The liquid crystal display module 110 is connected with an external printed circuit board 130 through a flexible circuit board 120, so that signals for controlling screen display are obtained from a control circuit.

As described in the background section, warpage may occur in the manufacturing process of the flexible circuit board, and if the warpage is excessive, there may be a problem of poor connection of devices.

Therefore, in the liquid crystal display device 100, when the warpage of the flexible circuit board 120 is excessive, there is a possibility that a problem of failure of the interconnection process of the liquid crystal display module 110 and the printed circuit board 130 may occur in the module production line when it is put into use. It will be appreciated that the liquid crystal display device 100 is merely described herein as an example, and in fact, the same problem may exist in all electronic products requiring the use of a flexible circuit board, and thus the application is not limited to the application scenario of liquid crystal display.

As described above, the conventional measurement method of the degree of warpage of FPC mainly uses a coordinate scale for measuring the warpage of the FPC by a measurer. Various problems may exist with such a measurement.

For example, the operation methods and sight line levels limited by different measuring staff are not uniform and difficult to manage, and the measured values often generate large errors, so that the measurement accuracy is not high.

In some scenarios, a plurality of FPCs may be connected to the PCB at the same time, so that a measurer needs to perform repeated measurement multiple times, and the working efficiency is low.

In addition, hard objects such as a coordinate ruler and the like can be influenced by measuring personnel to touch the golden finger area of the FPC by mistake, and gold-plated welding spots on the golden finger are damaged, so that the whole PCB is scrapped, and huge loss of raw materials is caused.

Fig. 2 is a schematic diagram of an apparatus 200 for detecting warpage of a flexible circuit board according to an embodiment of the present application.

As shown in fig. 2, the apparatus 200 for detecting warpage of a flexible circuit board may include a fixing structure 210, the fixing structure 210 being used to fix one side of the flexible circuit board 120 such that the flexible circuit board 120 extends from the fixing structure 210 in a direction away from the fixing structure 210.

The device 200 for detecting the warpage of a flexible circuit board may further include a light source assembly 220, where the light source assembly 220 is disposed on one side of the fixing structure 210 for fixing the flexible circuit board 120, and includes a light source emitting end 221 and a light source receiving end 222, the light source emitting end 221 is configured to emit light, the light source receiving end 222 is configured to receive the light emitted by the light source emitting end 221, a propagation direction of the light emitted by the light source emitting end 221 is perpendicular to an extending direction of the flexible circuit board 120, and an orthographic projection of the light on a plane where the flexible circuit board 120 is located in an orthographic projection of the flexible circuit board 120 on the plane, and a distance between the light and the plane in a direction perpendicular to the plane is smaller than a preset distance.

It should be noted that, in some embodiments, the device 200 for detecting warpage of a flexible circuit board provided in the present application is an axisymmetric structure, and the direction of the symmetry axis is the same as the extending direction of the flexible circuit board 120, so that the positions of the light source emitting end 221 and the light source receiving end 222 can be exchanged during the application process, as shown in fig. 2, where the light source emitting end 221 is at the left side of the fixing structure 210 in the drawing, and the light source receiving end 222 is at the right side of the fixing structure 210 in the drawing. The positions of the light source emitting end 221 and the light source receiving end 222 may also be exchanged, that is, the light source receiving end 222 is positioned at the left side of the fixing structure 210 in the drawing, and the light source emitting end 221 is positioned at the right side of the fixing structure 210 in the drawing.

In order to ensure that the light emitted by the light source emitting end 221 can effectively detect the warpage of the flexible circuit board 120, the orthographic projection of the light emitted by the light source emitting end 221 in the plane of the flexible circuit board 120 is always located in the orthographic projection of the flexible circuit board 120 in the plane of the flexible circuit board 120 no matter above or below the flexible circuit board 120.

In some embodiments, a printed circuit board 130 is also connected to one side of the flexible circuit board 120.

The fixing structure 210 further includes a fixing base 211, and the fixing base 211 is provided with a positioning groove 2111 for placing the printed circuit board 130.

The fixing structure 210 further includes a fixing cover plate 212, and the fixing cover plate 212 is matched with at least a portion of the fixing base 211 where the positioning groove 2111 is provided, so as to fix the printed circuit board 130 placed in the positioning groove 2111.

In some embodiments, the positioning groove 2111 is formed at a side edge of the fixing base 211 or a position near the edge, and the opening depth and length of the positioning groove 2111 may be set according to the actual situation of the accommodated printed circuit board 130. When the printed circuit board 130 is placed in the positioning groove 2111, the flexible circuit board 120 to which the printed circuit board 130 is connected is suspended on the opening side of the positioning groove 2111.

Since the flexible circuit board 120 is in a suspended state at this time, the structure on the suspended side may be bent downwards due to the action of gravity, but since the flexible circuit board is usually a flexible printed circuit board made of polyimide or mylar as a base material, which has high reliability, excellent flexibility, and thus has the advantages of high wiring density, light weight and thin thickness, even if the structure on the suspended side is bent downwards due to the action of gravity, the detection process of the present application is not seriously affected, and the present application deals with the problem by arranging the light source detection structures above and below the flexible circuit board, which will be described in detail later.

As shown in fig. 3, the opening direction of the positioning groove 2111 is perpendicular to the extending direction of the flexible circuit board 120.

In some embodiments, the flexible circuit board 120 is further provided with an opening, and the fixing structure 210 further includes a fixing pin 2112, where the fixing pin 2112 is disposed on the fixing base 211 and/or the fixing cover 212, and is used to be clamped with the opening, so as to limit the flexible circuit board 120.

In some embodiments, positioning pins 2112 for positioning the flexible circuit board 120 are provided in the positioning grooves 2111, the pins 2112 being configured to face a side of the fixed cover plate 212, the height of the pins 2112 being greater than the depth of the positioning grooves 2111 and greater than the thickness of the printed circuit board 130 placed in the positioning grooves 2111 to ensure that the printed circuit board 130 does not slip off the positioning grooves 2111.

In some embodiments, the positioning cover 212 may further include a first magnetic component 2121, where the first magnetic component 2121 is disposed on a side of the positioning cover 212 facing the fixing base 211.

In some embodiments, the fixing base 211 may further include a second magnetic part 2113, and the second magnetic part 2113 is disposed at a side of the fixing base 211 corresponding to the first magnetic part 2121 toward the fixing cover 212.

Wherein, the first magnetic component 2121 and the second magnetic component 2113 are fixed by magnetic attraction to fix the fixed cover 212 and the fixed base 211.

In some embodiments, one of the first and second magnetic members 2121, 2113 has a magnetically attractive aperture and the other of the first and second magnetic members 2121, 2113 has a magnetically attractive protrusion that mates with the magnetically attractive aperture.

In some embodiments, the positioning cover 212 may further include a first connection component disposed at an end of the fixing cover 212 away from the extending direction of the flexible circuit board 120.

In some embodiments, the fixing base 211 may further include a second connection part disposed at an end of the fixing base 211 corresponding to the first connection part away from the extending direction of the flexible circuit board 120.

The first connecting part and the second connecting part are fixed by a rotating shaft so that the fixed cover plate 212 is rotationally connected with the fixed base 211.

The fixed cover 212 is rotatably connected with the fixed base 211, i.e. is similar to a hinge flip cover, when the device provided by the application works, the fixed cover 212 can be turned down and pressed on the flexible circuit board 120 to fix the flexible circuit board 120.

In some embodiments, the first connecting member and the second connecting member are each provided with a rotation shaft hole through which the rotation shaft passes, and the first connecting member and the second connecting member are fixed by the rotation shaft hole through which the rotation shaft passes.

In some embodiments, the printed circuit board 130 further includes a driving chip thereon, and the fixed cover plate 212 further includes a groove 2122 disposed toward the extending direction of the flexible circuit board 123. The recess is used to expose the driving chip 130 when the fixing cover 212 is fixed on the fixing base 211.

Since various electronic components are integrated on the printed circuit board 130, in order to avoid the fixed cover plate 212 from crushing the electronic components on the printed circuit board 130, the position of the printed circuit board is reserved in advance at the position of the fixed cover plate 212 corresponding to the printed circuit board 130, so that the limit can be ensured, and failure caused by the cover plate touching the electronic components can be avoided.

In some embodiments, a plurality of the grooves 2122 are disposed on the fixed cover 212 side by side, and a pressing member 2123 is disposed between adjacent grooves 2122, where the pressing member 2123 is used to press and fasten on the flexible circuit board 120 to fix the flexible circuit board 120.

Fig. 5 (a) shows a schematic structural diagram of a light source assembly provided in an embodiment of the present application.

In some embodiments, the stationary base 211 further comprises: the first protruding portion and the second protruding portion protruding outwards along the extending direction of the flexible circuit board 120 are located on two sides of the flexible circuit board 120 perpendicular to the extending direction of the flexible circuit board 120, the light source emitting end 221 is disposed on a surface of the first protruding portion facing the flexible circuit board 120, and the light source receiving end 222 is disposed on a surface of the second protruding portion facing the flexible circuit board 120.

In some embodiments, the light source emitting end 221 and the light source receiving end 222 may be disposed above the plane of the flexible circuit board 120 correspondingly, and the distance between the light emitted by the light source emitting end 221 and the plane of the flexible circuit board 120 is smaller than the preset distance.

In some embodiments, the distance between the light emitted by the light source emitting end 221 and the plane of the flexible circuit board 120 perpendicular to the plane of the flexible circuit board 120 is determined according to the detection target of the flexible circuit board, and when the warpage range of the detection target is large, the distance may be relatively far, and when the warpage range of the detection target is small, the distance may be relatively near. For example, when the range of the warpage of the detection target is smaller, which means that the detection is more strict and sensitive, the warpage portion affects the light propagation when the flexible circuit board is slightly warped.

In some embodiments, since the warpage of the flexible circuit board 120 is not directional, it may be upward warpage or downward warpage.

In some embodiments, if the situation of upward warpage is considered, the light source emitting end 221 may be disposed above the plane of the flexible circuit board 120, so that the light emitted by the light source emitting end 221 is above the plane of the flexible circuit board 120, and thus the upward warpage of the flexible circuit board 120 is detected.

In some embodiments, if downward warping is considered, the light source emitting end 221 may be disposed below the plane of the flexible circuit board 120, so that the light emitted by the light source emitting end 221 is below the plane of the flexible circuit board 120, and thus the downward warping of the flexible circuit board 120 is detected.

In some embodiments, if both the upward and downward warpage are considered, the first and second light sources 2211 and 2212 may be sequentially disposed in a perpendicular direction of the light source emitting end 221 along the extending direction of the flexible circuit board 120; the light source receiving end 222 may include a first receiving end 2221 and a second receiving end 2222 sequentially disposed in a perpendicular direction to the extending direction of the flexible circuit board 120.

Since the light source receiving end 222 in fig. 5 (a) is blocked for viewing angle, fig. 5 (B) shows a detail of the light source receiving end 222, in which the light source receiving end 222 is rotated clockwise by 90 ° in the viewing angle direction of the light source receiving end 222 in fig. 5 (a) with the plane of the flexible circuit board 120 as the coordinate system. The light source receiving end 222 includes a first receiving end 2221 and a second receiving end 2222.

The first light source 2211 emits a first light, and the first receiving end 2221 corresponds to the first light source 2211 to receive the first light; the second light source 2212 emits a second light, and the second receiving end 2222 corresponds to the second light source 2212 to receive the second light.

In some embodiments, to ensure that the first light source 2211 emits the first light and the second light source 2212 emits the second light can effectively detect the warpage of the flexible circuit board 120, the setting positions of the first light source 2211 and the second light source 2212 can be adjusted so that the first distance between the first light and the plane of the flexible circuit board 120 and the second distance between the second light and the plane of the flexible circuit board 120 are smaller than the preset distance.

In some embodiments, further considering that the flexible circuit board 120 is placed in a suspended state in the fixing structure 210, and a side structure of the flexible circuit board 120 on the suspended side may be bent downward due to gravity, the detection distance when the flexible circuit board is warped upward may also be increased, and the relative position between the first light source 2211 and the second light source 2212 may be further adjusted so that the first distance is not less than the second distance.

In some embodiments, the first light source 2211 is disposed at the same distance from the flexible circuit board 120 as the second light source 2212 is disposed at the same distance from the flexible circuit board 120 if gravity is not considered or the influence of gravity is negligible (assuming that no warpage occurs in the initial state of the flexible circuit board under ideal conditions). I.e. when the first distance is equal to the second distance.

It should be noted that, the distance between the first light source 2211 and the second light source 2212 determines the distance between the first light and the second light and the plane of the flexible circuit board, and may be flexibly set according to the warp detection specification of the flexible circuit board 120.

In some embodiments, the first light source 2211 and the second light source 2212 include at least one of a point light source, a linear light source and a surface light source, when the light source is a point light source, the light source emits a light beam parallel to a plane of the flexible circuit board 120, when the light source is a linear light source, the light source emits a light plane parallel to the plane of the flexible circuit board 120, and when the light source is a surface light source, the light source emits a light beam parallel to the plane of the flexible circuit board 120.

In a specific implementation, the light source emitting end 221 at one side of the fixing base 210 is turned on to emit light, so as to observe whether the light path is blocked when passing through the FPC, and simultaneously observe the spot shape of the light receiving area at the opposite light source receiving end 222. And judging whether the FPC warpage exceeds the specification or not through a ray line and the facula morphology. If the warpage exceeds the specification, the light ray path is blocked by the FPC, resulting in the light receiving area spot at the light source receiving end 222 not being formed. If the warp is within the specification range, the light propagation path is not disturbed, and a clear spot morphology can be observed in the light receiving area at the light source receiving end 222.

In some embodiments, to avoid light source divergence from affecting warp detection, it is preferred that the first light source 2211 and the second light source 2212 are laser light sources. Laser is also the only non-divergent light source (extremely low divergence) in the current artificial light source, and can be applied to the measurement of the warping degree of the flexible circuit board of the application because the laser is not scattered and is completely directly irradiated.

In some embodiments, the flexible circuit board 120 includes a binding region. The binding area is a golden finger of the flexible circuit board, and the golden finger is used as a component for connecting the liquid crystal display module 110 and the flexible circuit board 120, all signals are transmitted through the golden finger, and the golden finger plays a role in binding the liquid crystal display module 110 and the flexible circuit board 120 in electric connection. The gold finger is composed of a plurality of golden yellow conductive contact pieces, and is called as a gold finger because the surface of the gold finger is plated with gold and the conductive contact pieces are arranged like fingers.

As within the dashed box in fig. 1, is the binding area of the flexible circuit board 120. The orthographic projection of the light emitted from the light source emitting end 221 in the plane of the flexible circuit board 120 at least partially overlaps with the orthographic projection of the bonding area in the plane. The warping degree of the key part of the flexible circuit board can be effectively detected even if the light source is a point light source.

Fig. 6 (a) shows a schematic structural diagram of another light source assembly according to an embodiment of the present application.

As shown in fig. 6 (a), in this application, besides the detection performed by using a line light source, a point light source may be used for detection, and compared with the line light source, the point light source has the same nondestructive detection function, but only has a difference in the appearance of the light source, and is also within the protection scope of this patent.

When the light source emitting end is the point light source 223, the third light source 2231 and the fourth light source 2232 are included. The third light source 2231 and the fourth light source 2232 are arranged in the same manner as the first light source 2211 (linear light source) and the second light source 2212 (linear light source), and are not described here again.

Since the light source receiving end 224 in fig. 6 (B) is blocked for viewing angle, fig. 6 (B) shows a detail of the light source receiving end 224, in which the light source receiving end 224 is rotated clockwise by 90 ° from the viewing angle direction of the light source receiving end 224 in fig. 6 (a) with the plane of the flexible circuit board 120 as a coordinate system. The light source receiving end 224 includes a third receiving end 2241 and a fourth receiving end 2242.

Those of ordinary skill in the art will appreciate that: the discussion of any of the embodiments above is merely exemplary and is not intended to suggest that the scope of the application (including the claims) is limited to these examples; the technical features of the above embodiments or in different embodiments may also be combined under the idea of the present application, the steps may be implemented in any order, and there are many other variations of the different aspects of the present application as described above, which are not provided in details for the sake of brevity.

This application is intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Accordingly, any omissions, modifications, equivalents, improvements and the like, which are within the spirit and principles of the application, are intended to be included within the scope of the present application.

Claims

1. An apparatus for detecting warpage of a flexible circuit board, comprising:

2. The apparatus of claim 1, wherein a printed circuit board is connected to one side of the flexible circuit board, and the fixing structure comprises:

3. The device of claim 2, wherein the flexible circuit board is provided with an opening; the fixing structure further includes:

4. The apparatus according to claim 2, characterized by comprising:

5. The apparatus according to claim 4, comprising:

one of the first magnetic member and the second magnetic member has a magnetic attraction hole, and the other of the first magnetic member and the second magnetic member has a magnetic attraction protrusion that mates with the magnetic attraction hole.

6. The apparatus according to claim 2, characterized by comprising:

7. The apparatus according to claim 6, comprising:

the first connecting part and the second connecting part are respectively provided with a rotating shaft hole for the rotating shaft to pass through, and the first connecting part and the second connecting part are fixed through the rotating shaft holes for the rotating shaft to pass through.

8. The device of claim 2, wherein the printed circuit board is provided with a driving chip, and the fixing cover plate includes a groove disposed toward an extending direction of the flexible circuit board, the groove being for exposing the driving chip when the fixing cover plate is fixed on the fixing base.

9. The device of claim 8, wherein a plurality of the grooves are arranged side by side on the fixed cover plate, and a pressing component is arranged between adjacent grooves and is used for pressing and buckling on the flexible circuit board to fix the flexible circuit board.

10. The apparatus of claim 2, wherein the stationary base comprises: the light source comprises a first protruding part and a second protruding part protruding outwards along the extending direction, wherein the first protruding part and the second protruding part are positioned on two sides of the flexible circuit board perpendicular to the extending direction, the light source emitting end is arranged on one surface of the first protruding part, which faces the flexible circuit board, and the light source receiving end is arranged on one surface of the second protruding part, which faces the flexible circuit board.

11. The apparatus of claim 10, wherein the light source emitting end comprises a first light source and a second light source sequentially arranged in a direction perpendicular to an extending direction of the flexible circuit board; the light source receiving end comprises a first receiving end and a second receiving end which are sequentially arranged along the vertical direction of the extending direction of the flexible circuit board;

12. The device of claim 11, wherein a first distance between the first light and a plane of the flexible circuit board and a second distance between the second light and a plane of the flexible circuit board are both less than the predetermined distance.

13. The apparatus of claim 12, wherein the first distance is not less than the second distance.

14. The device of claim 11, wherein the first light source and the second light source comprise at least one of a point light source, a line light source, and a surface light source.

15. The device of claim 1, wherein the light emitted from the light source emitting end is a laser.

16. The device of claim 1, wherein the flexible circuit board includes a binding region, and wherein an orthographic projection of the light rays in a plane of the flexible circuit board at least partially overlaps an orthographic projection of the binding region in the plane.

17. The apparatus of claim 1, wherein the predetermined distance is sized according to a detection target of the flexible circuit board.