JP2007234915A - Wiring board, wiring cable, electronic equipment, and method for connecting wiring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To keep a positioning accuracy and to reduce an area used for a connection in connecting a wiring board and a wiring cable. <P>SOLUTION: An electronic equipment 1 comprises the wiring board 10 with a plurality of wiring patterns 11 provided at the end part of a board 10a and the wiring cable 20 with a plurality of terminals 21 provided at the end part of a base film 20a, and the wiring patterns 11 and the terminals 21 corresponding each other respectively connected. The shape of the connection part of two wiring patterns and two terminals parted each other out of the plurality of wiring patterns 11, and the plurality of terminals 21 corresponding each other are different from the shape of the other wiring pattern and the other terminals. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a wiring cable and a wiring board in an electronic device / device provided with a wiring cable for transmitting a signal and a wiring board having a function for processing a signal sent via the wiring cable. In particular, the present invention relates to a wiring board, a wiring cable, an electronic device, and a wiring connection method capable of determining a connection position and reducing the size of the device.

  In order to drive the electric equipment / device, a wiring cable and a substrate having a function for processing a signal are incorporated. The wiring cable includes a flexible printed circuit (FPC) in which only a signal line is formed on a base film, a tape carrier package (TCP), a tape automated bonding (TAB) in which a signal line and an IC exist on the base film, and a chip. There are cables such as On Film (COF), and usually a plurality of wires are arranged in parallel. And the signal transmission with a board | substrate is performed through the wiring of these cables, and the electric equipment / device is driven.

  For the electrode terminals for connecting the substrate and the wiring cable, ITO (Indium Tin Oxide), solder, gold plating, or the like is used, and solder, Anisotropic Conductive Film (ACF), or the like is used to connect the electrode ends. In addition, positioning marks are formed on the substrate and the wiring cable in addition to the connection electrode terminals in order to connect to each other at desired positions (see, for example, Patent Document 1). In recent years, with high-speed transmission and multi-functionalization of electrical equipment / devices, the amount of data handled by electrical equipment has increased, and the number of wiring cables that transmit the data and the number of signals on the board that processes the data have increased.

  FIG. 5 is a schematic diagram for explaining a conventional example. As shown in FIG. 5A, in the prior art, when the wiring board 10 and the wiring cable 20 are connected, the connection electrode terminals of the two (the wiring pattern 11 in the wiring board 10 and the terminal 21 in the wiring cable 20). In order to connect each other at a desired position, positioning marks M and M ′ are provided on both the wiring board 10 and the wiring cable 20 separately from the connection electrode terminals.

  In general, the positioning marks M and M 'are arranged at least two at each end of the wiring board 10 and the wiring cable 20 as shown in FIG. The number of the positioning marks M and M ′ is not limited as long as the desired positioning is possible.

  In the example shown in FIG. 5, two cross-shaped positioning marks M are formed on both outer ends of the plurality of wiring patterns 11 on the wiring board 10, and one wiring cable 20 has a cross notch on each end. Two positioning marks M ′ are provided. The wiring cable 20 itself has a very thin film shape, and in order to maintain the strength of the cut crosses around the cross cuts at both ends, an electrode having a floating or fixed voltage is prepared, A cut is made in the cross along with the film.

  When the wiring board 10 and the wiring cable 20 are connected, as shown in FIG. 5B, the positioning mark M ′ of the wiring cable 20 is positioned with respect to the cross-shaped positioning mark M of the wiring board 10. The connection is made at the desired position with the cross notch.

JP 2003-131484 A

  As described above, the increase in the number of signals of the wiring cable and the wiring board increases the area of the wiring cable, and further increases the area of the wiring board to which the wiring cable is connected. However, increasing the area hinders downsizing of the device and is not desirable from the viewpoint of cost.

  On the other hand, the area expansion can be suppressed by narrowing the signal line width of the wiring cable or by reducing the positioning mark, but the reduction of the signal line width leads to the reduction of the connection electrode terminal width, and accordingly, the electrode contact between the substrates. The reduction of the area is inevitable and causes an increase in connection resistance. Further, the narrowness of the electrode terminal width tends to cause a connection failure caused by a slight shift during connection.

  Further, the reduction of the positioning mark causes a decrease in positioning accuracy, and accordingly, an increase in misalignment at the time of connection is inevitable, and a connection failure is liable to be caused. As described above, the increase in the area of the wiring cable and the board is not desirable from the cost aspect as the number of signals increases, and suppressing the expansion of the area causes deterioration of the connection accuracy, which is undesirable from the viewpoint of quality and reliability. The problem arises.

  The present invention has been made to solve such problems. That is, according to the present invention, in a wiring board in which a plurality of wiring patterns for connection with a signal cable are provided at the end of the board, the shape of the contact portion with the signal cable in the plurality of wiring patterns, Of these, two spaced apart wiring patterns have different shapes from the other wiring patterns.

  In the present invention as described above, the shape of the contact portion of the two wiring patterns separated from each other among the plurality of wiring patterns is different from the shape of the other wiring patterns. The pattern can be used as a reference mark for alignment.

  In addition, the present invention provides a wiring cable in which a plurality of terminals for connection with a wiring pattern provided on a wiring board are provided at an end of a base film, and as a shape of a contact portion with a wiring pattern at a plurality of terminals, Two terminals apart from each other in a plurality of terminals have different shapes from the other terminals.

  In the present invention, since the shape of the contact portion between the plurality of terminals and the wiring pattern of the two separated terminals is different from the shape of the other terminals, the two separated terminals are aligned. It can be used as a reference mark for use.

  In addition, the present invention connects the corresponding wiring patterns and terminals of the wiring board in which a plurality of wiring patterns are provided at the end of the substrate and the wiring cable in which the plurality of terminals are provided at the end of the base film. In the electronic device, the shape of the contact portion of the plurality of wiring patterns and the plurality of terminals includes a plurality of wiring patterns and two wiring patterns and two terminals separated from each other among the plurality of terminals corresponding thereto, It has a different shape from the wiring pattern and other terminals.

  In the present invention, two spaced apart wiring patterns among the plurality of wiring patterns of the wiring board and two spaced apart terminals among the plurality of terminals of the wiring cable are used as the alignment reference marks. It is possible to perform alignment without preparing a separate mark.

  In addition, the present invention connects a wiring board having a plurality of wiring patterns provided at an end portion of the substrate and a corresponding wiring pattern and a terminal having a plurality of terminals provided at an end portion of the base film. In the wiring connection method, as the shapes of the contact portions of the plurality of wiring patterns and the plurality of terminals, the two wiring patterns and the two terminals separated from each other among the plurality of wiring patterns and the plurality of terminals respectively corresponding thereto are used as other wirings. It has a different shape from the pattern and other terminals. The shape of the two wiring patterns and the shape of the two terminals are read by the image reading means and image processing is performed. This is a wiring connection method for performing connection with a plurality of terminals.

  In the present invention as described above, the image reading unit reads an image of two separated wiring patterns among the plurality of wiring patterns on the wiring board and an image of two separated terminals among the plurality of terminals of the wiring cable. Can be recognized as a reference mark by image processing, and the both can be accurately positioned.

  Here, as the two wiring patterns and two terminals that can be used as the reference mark, the other wiring pattern and the other terminal as a shape are provided with notches (for example, rectangular notches), By using what is arranged at both ends among the plurality, it is possible to accurately recognize the positions of the wiring board and the wiring cable in the vertical and horizontal directions and the rotation.

  Moreover, as a wiring cable, only a signal line may be arrange | positioned at a base film, and circuits, such as IC other than a signal line, may be arrange | positioned.

  As a result, in the present invention, the positioning mark that determines the connection position of both the wiring cable and the wiring board to which the cable is connected is also used by the terminal and the wiring pattern, and the positioning mark is maintained while maintaining the positioning accuracy. The area occupied by can be significantly reduced.

  According to the present invention, in an electrical apparatus / device provided with a wiring cable for transmitting a signal and a wiring board having a function for processing a signal sent via the wiring cable, the wiring board and the wiring Since the area occupied by the positioning mark for connection with the cable can be remarkably reduced, it is possible to reduce the size of the device and reduce the cost by reducing the area of the wiring cable and the wiring board.

  In addition, if the connection occupation area between the wiring cable and the wiring board is maintained, the line width can be increased if the number of signals is the same. Improvements can be made. In addition, since the area required for the positioning marks can be used for the signal lines, it is possible to increase the number of signal lines while maintaining quality and reliability.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic plan view for explaining an electronic apparatus using a wiring board and a wiring cable according to the present embodiment. That is, the electronic device 1 according to the present embodiment includes a wiring board 10 in which a plurality of wiring patterns are provided at the end of the substrate 10a, and a wiring cable 20 in which a plurality of terminals 21 are provided at the end of the base film 20a. The wiring pattern 11 and the terminal 21 corresponding to the wiring board 10 and the wiring cable 20 are connected to each other.

  In particular, in the electronic device 1 according to the present embodiment, in the shape of the contact portions of the plurality of wiring patterns 11 and the plurality of terminals 21, two wirings separated from each other among the plurality of wiring patterns 11 and the plurality of terminals 21 respectively corresponding thereto. The pattern and the two terminals are characterized in that they have different shapes from other wiring patterns and other terminals.

  FIG. 2 is an enlarged schematic plan view of a connection portion between the wiring board and the wiring cable. In the example shown in FIG. 2, among the plurality of wiring cables 11 provided on the wiring board 10, the two wiring patterns 11 a located at both ends have different shapes from the shapes of the other wiring patterns 11 b. Specifically, a rectangular notch K is provided in the shape of the connection portion between the two wiring patterns 11a and the terminal 21a. The shapes of the two wiring patterns 11a are line symmetric.

  On the other hand, about the wiring cable 20, the shape of the two terminals 21a located in both ends among the some terminals 21 is provided so that it may differ from the shape of the other terminal 21b. Specifically, a rectangular cutout portion K ′ is provided in the shape of the connection portion between the two terminals 21 a and the wiring pattern 11 a. The shapes of the two terminals 21a are line symmetric.

  In this way, the two separated wiring patterns 11a of the wiring board 10 and the two separated terminals 21a of the wiring cable 20 are shaped to be unique to the other wiring patterns 11b and the other terminals 21b. Thus, the wiring pattern 11a and the terminal 21a can be used as a positioning reference mark.

  Further, by associating the shape of the wiring pattern 11a with the shape of the terminal 21a as a unique shape, it is possible to improve the alignment accuracy in the vertical and horizontal directions and the rotation direction when the wiring pattern 11a and the terminal 21a are overlapped. It becomes possible.

  Here, the connection between the wiring board 10 and the wiring cable 20 by positioning the two wiring patterns 11a and the two terminals 21a is performed by image processing. That is, first, an image of the notch K in the two wiring patterns 11a of the wiring board 10 is captured by an image reading unit such as a CCD camera. Then, image processing is performed on the captured image, the positions of the sides and corners of the notch K are calculated, and the center of gravity of the notch K is obtained. Thereafter, the positions of the wiring board 10 in the vertical and horizontal directions and in the rotational direction are grasped from the positions of the center of gravity of the cutout portions K in the two wiring patterns 11a.

  Next, the image of the notch K 'in the two terminals 21a of the wiring cable 20 is captured by image reading means such as a CCD camera by similar image capturing. Then, image processing is performed on the captured image, the positions of the sides and corners of the notch K ′ are calculated, and the center of gravity of the notch K ′ is obtained. Thereafter, the position of the wiring cable 20 in the vertical and horizontal directions and in the rotational direction is grasped from the position of the center of gravity of each notch K ′ in the two terminals 21a.

  As the shape of the notches K and K ′, it is desirable that the positions of the sides and corners are easily detected by image processing, or the shape where the center of gravity is easily calculated. In this embodiment, an image reading such as a CCD camera is performed. It is a rectangle that fits within the field of view. In addition, if a gravity center position can be calculated by image processing, it will not be limited to a rectangle.

  After grasping the positional deviation between the wiring board 10 and the wiring cable 20, the wiring cable 20 is overlaid on the wiring board 10 based on the obtained position, and the wiring pattern 11 and the corresponding terminal 21 are overlaid and connected. .

  FIG. 3 is a schematic plan view illustrating a state in which the wiring board and the wiring cable are overlapped. In the present embodiment, since the wiring pattern 11a and the terminal 21a used as the positioning reference marks are also signal conduction patterns like the other wiring patterns 11b and the other terminals 21b, the two wiring patterns 11a and the two terminals 21a are used. Is equal to or greater than the contact area between the other wiring pattern 11b and the other terminal 21b, and even if it is used as a reference mark, it is reliable without impairing electrical characteristics (for example, contact resistance). You can get continuity.

  If the wiring pattern 11 of the wiring board 10 and a part of the terminal 21 of the wiring cable 20 are used as positioning reference marks as in this embodiment, there is no need to separately provide a reference mark on the outside. All the widths of the base film can be used in the arrangement of the wiring patterns 11 and the terminals 21. As a result, the width of the wiring pattern 11 and the terminal 21 can be increased with the determined width of the substrate and base film and the determined number, and many wiring patterns 11 can be formed with the width of the determined substrate and base film. In addition, the terminal 21 can be formed. In addition, it is possible to provide a margin for the allowable range of misalignment between the wiring pattern 11 and the terminal 21, and a reliable connection can be realized due to misalignment.

  FIG. 4 is a schematic plan view for explaining another embodiment. The wiring patterns and terminals in this embodiment are characterized in that the shapes of the two wiring patterns 11a and the two terminals 21a used as reference marks are the same.

  In the example shown in FIG. 2, the shapes of the two wiring patterns 11a and the two terminals 21a used as the reference marks are axisymmetric, but the shapes of the two wiring patterns 11a and the two terminals 21a shown in FIG. 4 are the same. It is provided in the direction.

  That is, among the plurality of wiring patterns provided at the end of the wiring substrate 10, the two wiring patterns 11a located at both ends are provided so as to have different shapes from the other wiring patterns 11b. Specifically, a rectangular notch K is provided in the shape of the connection portion between the two wiring patterns 11a and the terminal 21a. Further, the two wiring patterns 11a have the same shape.

  On the other hand, about the wiring cable 20, the shape of the two terminals 21a located in both ends among the some terminals 21 is provided so that it may differ from the shape of the other terminal 21b. Specifically, a rectangular cutout portion K ′ is provided in the shape of the connection portion between the two terminals 21 a and the wiring pattern 11 a. The two terminals 21a have the same shape.

  In this way, the two separated wiring patterns 11a of the wiring board 10 and the two separated terminals 21a of the wiring cable 20 are shaped to be unique to the other wiring patterns 11b and the other terminals 21b. Thus, the wiring pattern 11a and the terminal 21a can be used as a positioning reference mark.

  Further, by associating the shape of the wiring pattern 11a with the shape of the terminal 21a as a unique shape, it is possible to improve the alignment accuracy in the vertical and horizontal directions and the rotation direction when the wiring pattern 11a and the terminal 21a are overlapped. It becomes possible.

  The two wiring patterns 11 a provided at both ends of the wiring substrate 10 and the two terminals 21 a provided at both ends of the wiring cable 20 are themselves conductive patterns for signal transmission, and the connection between the wiring substrate 10 and the wiring cable 20. It also serves as a reference mark for positioning that determines the position. Therefore, it is not necessary to provide a separate reference mark, and the width of the substrate or base film can be used effectively.

  Further, since the two wiring patterns 11a and the two terminals 21a have the cutouts K and K ′ in the same direction, the same detection program is used when an image is captured by an image reading means such as a CCD camera and processed. It becomes possible to accurately and rapidly align the wiring board 10 and the wiring cable 20 in the vertical and horizontal directions and the rotational direction.

  In any of the above embodiments, the wiring patterns and terminals used as the reference marks are those arranged at both ends. Two wiring patterns having two and two terminals may be provided as a reference mark in a different shape from other wiring patterns and other terminals. Further, the number of wiring patterns and terminals used as reference marks is not limited to two, and can be applied to three or more. Further, the cutouts K and K ′ are used as the unique shapes of the wiring pattern 11a and the terminal 21a, but a convex shape may be used instead of the cutout.

  The wiring cable 20 to which the present invention is applied includes a Flexible Printed Circuit (FPC) or Tape Carrier Package (TCP) in which only the terminal 21 is formed on the base film 20a, and Tape Automated in which the terminal 21 and components such as an IC exist. Bonding (TAB) or Chip On Film (COF) may be used. The electronic device 1 using the wiring substrate 10 and the wiring cable 20 of the present invention includes various devices such as a liquid crystal display device, an organic EL display device, a plasma display device, a personal computer, an optical drive, a mobile phone, and a mobile terminal. It is applicable to.

It is a model top view explaining the electronic device using the wiring board and wiring cable which concern on this embodiment. It is an expansion model top view of the connection part of a wiring board and a wiring cable. It is a schematic top view explaining the state which performed the superimposition of the wiring board and the wiring cable. It is a schematic plan view explaining other embodiment. It is a schematic diagram explaining a prior art example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Electronic device, 10 ... Wiring board, 10a ... Board, 11 ... Wiring pattern, 20 ... Wiring cable, 20a ... Base film, 21 ... Terminal, K ... Notch part, K '... Notch part

Claims (15)

In the wiring board in which a plurality of wiring patterns for connecting to the signal cable are provided at the end of the board,
The shape of the contact portion with the signal cable in the plurality of wiring patterns is such that two separated wiring patterns of the plurality of wiring patterns have different shapes from the other wiring patterns. . The wiring board according to claim 1, wherein the two wiring patterns are disposed at both ends of the plurality of wiring patterns. The notch is provided in the contact part with the said signal cable of the said two wiring patterns. The wiring board of Claim 1 characterized by the above-mentioned. The shape of the contact part with the said signal cable of the said two wiring patterns is axisymmetric. The wiring board of Claim 1 characterized by the above-mentioned. The wiring board according to claim 1, wherein a rectangular cutout is provided in a contact portion between the two wiring patterns with the signal cable. The wiring board according to claim 1, wherein a contact area of the two wiring patterns with the signal cable is equal to or greater than a contact area of the other wiring pattern with the signal cable. In the wiring cable in which a plurality of terminals for connecting to the wiring pattern provided on the wiring board are provided at the end of the base film,
The shape of the contact portion with the wiring pattern in the plurality of terminals is such that two spaced apart terminals of the plurality of terminals have different shapes from the other terminals. The wiring cable according to claim 7, wherein the two terminals are arranged at both ends of the plurality of terminals. The notch is provided in the contact part with the said wiring pattern of the said 2 terminal. The wiring cable of Claim 7 characterized by the above-mentioned. The shape of the contact part with the said wiring pattern of the said 2 terminal is axisymmetric. The wiring cable of Claim 7 characterized by the above-mentioned. The wiring cable according to claim 7, wherein a rectangular cutout is provided in a contact portion between the two terminals and the wiring pattern. The wiring cable according to claim 7, wherein a contact area of the two terminals with the wiring pattern is equal to or greater than a contact area of the other terminals with the wiring pattern. In an electronic device in which a plurality of wiring patterns are connected to a wiring board provided on the end of the substrate and a plurality of terminals connected to a wiring cable provided on the end of the base film, respectively, and terminals,
The shapes of the contact portions of the plurality of wiring patterns and the plurality of terminals are such that two wiring patterns and two terminals separated from each other among the plurality of wiring patterns and the plurality of terminals respectively corresponding thereto are other wiring patterns. An electronic device characterized by having a different shape from other terminals. The electronic device according to claim 13, wherein a shape of the two wiring patterns and a shape of the two terminals are substantially the same. In a wiring connection method for connecting a wiring board provided with a plurality of wiring patterns at the end of the substrate and a wiring pattern and a terminal corresponding to a wiring cable provided with a plurality of terminals at the end of the base film, respectively.
The shapes of the contact portions of the plurality of wiring patterns and the plurality of terminals are such that two wiring patterns and two terminals separated from each other among the plurality of wiring patterns and the plurality of terminals respectively corresponding thereto are other wiring patterns. And different shape from other terminals,
The shape of the two wiring patterns and the shape of the two terminals are read by image reading means and image processing is performed,
A wiring connection method, wherein the connection is performed by aligning the plurality of wiring patterns and the plurality of terminals corresponding to the plurality of wiring patterns from the result of the image processing.

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