JPH0541174U - Film substrate and its connection structure - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent disconnection of the connection terminals of the film board connected to the circuit board. [Structure] In the film substrate 4, a connection terminal 15 and a dummy terminal 21 are laid over the slit 12 between the film body 11 and the film piece 13 for preventing separation, and a dummy terminal at the end of the film body 11 is provided. Since the protrusion 22 is provided in the portion corresponding to 21, the recess 23 for escaping the connection terminal is provided in the portion corresponding to the connection terminal 15 at the end of the film body 11. The connection terminal 15 and the dummy terminal 21 are provided along one surface of the upper circuit board 3 that is bent at a substantially right angle in the vicinity of the tip end portion of the projecting piece 22, and are joined to the connection terminal provided on the one surface with solder or the like. There is. In this state, if the circuit board 3 receives an upward force for some reason and the tensile strength of the dummy terminal 21 cannot withstand this force, the dummy terminal 21 is cut, but the connection terminal 15 is recessed. It escapes into 23 and is not cut.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a film substrate and its connection structure.

[0002]

[Prior Art]

 In an electronic device such as a liquid crystal television, for example, as shown in FIG. 4, a liquid crystal display panel 2 is arranged on the front surface side of a frame-shaped holder 1 made of resin or the like, and a circuit board 3 is arranged on the rear surface side of the holder 1. Then, a backlight (not shown) is arranged between the liquid crystal display panel 2 and the circuit board 3, and the liquid crystal display panel 2 and the circuit board 3 are electrically connected via the plurality of film substrates 4. There is a structure. In this case, an IC chip 5 for driving the liquid crystal display panel 2 is mounted on the film substrate 4.

By the way, in the electronic device having such a structure, the film substrate 4 is bent along the end faces of the liquid crystal display panel 2 and the circuit substrate 3, and one end portion of the film substrate 4 is attached to the liquid crystal display panel 2 and the other end portion thereof is attached. Since they are respectively bonded to the circuit board 3, foldable portions are provided at both ends of the film substrate 4. That is, as shown in FIG. 5 and FIG. 6, the film substrate 4 has film pieces 13 for preventing scattering from being arranged at both ends (one end side is not shown) of the film body 11 via the slits 12. A wiring lead 14 made of a metal foil such as copper is patterned on one of these surfaces, so that the connection terminals 15 are laid over the slits 12 respectively. The connection terminals 15 that are respectively laid on the respective sides are bendable portions. The connection terminals 15 on the input side are provided along one surface of the upper circuit board 3 that is bent along the end surface of the circuit board 3, and are soldered to the connection terminals (not shown) provided on the one surface. It is joined. Although not shown, the connection terminals on the output side are provided along one surface of the upper liquid crystal display panel 2 which is bent along the end surface of the liquid crystal display panel 2, and are connected to the connection terminals provided on the one surface with solder or the like. It is joined.

[0004]

[Problems to be solved by the device]

 However, in such a conventional electronic device, when the holder 1 made of resin or the like expands in the direction of the arrow in FIG. 6 due to changes over time and the tensile strength of the connection terminal 15 cannot withstand this expansion, As shown in FIG. 7, there is a problem that the connection terminal 15 is disconnected. It is conceivable to increase the width of the slit 12 to some extent to allow a margin for the length of the connection terminal 15. However, in this case, the work of bending the connection terminal 15 at the end face portion of the circuit board 3 is extremely troublesome. Will be. An object of the present invention is to provide a film base plate and a connection structure thereof that can prevent the connection terminal of an appropriate length of the film substrate from being disconnected even if the holder expands unnecessarily. It is in.

[0005]

[Means for Solving the Problems]

 According to the first aspect of the present invention, the film pieces for preventing dispersion are arranged at the ends of the film body through the slits, and the wiring leads made of a metal foil such as copper are formed on one surface of the film pieces. By connecting the connection terminal and the dummy terminal to the slit portion and further providing the projecting piece at the portion corresponding to the dummy terminal at the end portion of the film body, the end portion of the film body is A recess for escaping the connection terminal is provided in a portion corresponding to the connection terminal. A second aspect of the present invention comprises the film substrate according to the first aspect and a circuit substrate connected to the film substrate, wherein the connection terminals and the dummy terminals of the film substrate are provided substantially in the vicinity of the tip of the projecting piece. It is bent at a right angle and is arranged along one surface of the circuit board, and is joined to a connection terminal provided on the one surface by soldering or the like.

[0006]

[Action]

 According to this invention, since the connection terminal and the dummy terminal are hung over the slit portion of the film substrate and the connection terminal escape recess is provided at the end of the film body, the connection terminal of the film substrate is provided. If the dummy terminals are bent almost at a right angle in the vicinity of the tips of the protrusions along one surface of the upper circuit board and the connection terminals provided on the one surface are joined by soldering or the like, the holder undesirably expands. Due to the inconvenience, even if a dummy terminal with an appropriate length is cut, the connection terminal on the film substrate can be released into the recess for escaping the connection terminal, thus reducing the length of the connection terminal on the film substrate. Even if the dummy terminal has the same length as the dummy terminal, the connection terminal can be prevented from being disconnected.

[0007]

【Example】

 1 and 2 show the essential parts of an electronic apparatus according to an embodiment of the present invention. In these drawings, the same reference numerals are given to the same names as those in FIGS. 5 and 6, and the description thereof will be appropriately omitted.

In this electronic device, three dummy terminals 21 are provided around the center and both sides of the slit 12 of the film substrate 4, and also correspond to the three dummy terminals 21 at the end of the film body 11. Since the three projecting pieces 22 are provided in the part, two recesses 23 for escaping the connection terminals are provided in the part corresponding to the connection terminal 15 at the end of the film body 11. In addition, a space 24 for escaping the connection terminal is provided in a predetermined one end surface portion of the circuit board 3. Then, the connection terminal 15 and the dummy terminal 21 are arranged along one surface of the upper circuit board 3 which is bent substantially at a right angle in the vicinity of the tip end portion of the projecting piece 22, and are soldered to a connection terminal (not shown) provided on the one surface. Etc. are joined together. That is, the three dummy terminals 21 are bent substantially at right angles in the vicinity of the tips of the protruding pieces 22. In this way, when the three dummy terminals 21 are bent at a substantially right angle in the vicinity of the tips of the respective protruding pieces 22, the connection terminals 15 are also substantially bent in the portions corresponding to the vicinity of the tips of the respective protruding pieces 22. Can be folded at a right angle.

As described above, in this electronic device, when the three dummy terminals 21 are bent at a substantially right angle in the vicinity of the tip end portions of the respective protruding pieces 22, the connection terminals 15 are accordingly moved to the tip end portions of the respective protruding pieces 22. Since it can be bent substantially at a right angle in the portion corresponding to the vicinity, even if the connection terminal 15 faces the recess 23 for escape of the connection terminal and the space 24 for escape of the connection terminal, the connection terminal 15 can be easily connected to the desired position. Can be folded in the street.

Now, in this electronic device, when the holder 1 made of resin or the like expands in the direction of the arrow in FIG. 2 due to aging, etc., and the tensile strength of the dummy terminal 21 cannot withstand this expansion, As shown in FIG. 3, the dummy terminal 21 is cut off. However, the connection terminal 15 is not cut because it escapes into the connection terminal escape recess 23 and the connection terminal escape space 24.

[0011]

[Effect of the device]

 As described above, according to the present invention, since the connection terminal and the dummy terminal are laid across the slit portion of the film substrate and the connection terminal escape recess is provided at the end of the film body, the holder Due to the inconvenience of undesired expansion, even if a dummy terminal of an appropriate length is cut, the connection terminal of the film substrate can be escaped into the recess for escape of the connection terminal. Can be prevented from disconnecting.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of an electronic device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

3 is a sectional view of the electronic device shown in FIG. 2 in a state in which a dummy terminal of a film substrate is cut.

FIG. 4 is an external view of an example of a conventional electronic device.

5 is a perspective view of a part of the electronic device shown in FIG.

6 is a cross-sectional view taken along the line BB of FIG.

7 is a sectional view of the electronic device shown in FIG. 5 in a state in which a connection terminal of a film substrate is cut off.

[Explanation of symbols]

 1 Holder 3 Circuit Board 4 Film Substrate 11 Film Body 12 Slit 13 Film Piece for Preventing Separation 14 Wiring Lead 15 Connection Terminal 21 Dummy Terminal 22 Projection Piece 23 Recessed Section for Releasing Connection Terminal 24 Space for Receiving Connection Terminal

Claims (2)

[Scope of utility model registration request] 1. A film piece for preventing dispersion is arranged at an end portion of a film main body through a slit, and a wiring lead made of a metal foil such as copper is patterned on one surface of the film piece to form a slit. By connecting the connection terminal and the dummy terminal to the portion, and further by providing the projecting piece at the portion corresponding to the dummy terminal at the end portion of the film body, it corresponds to the connection terminal at the end portion of the film body. A film substrate, wherein a concave portion for escaping a connection terminal is provided in a portion to be opened. 2. The film substrate according to claim 1, and a circuit substrate connected to the film substrate, wherein the connection terminal and the dummy terminal of the film substrate are bent at a substantially right angle in the vicinity of the tip of the projecting piece. A connection structure for a film substrate, which is arranged along one surface of the circuit board and is joined to a connection terminal provided on the one surface via solder or the like.