JPH0582200A - Heat seal connector - Google Patents

Abstract

PURPOSE:To improve workability for aligning a circuit with a heat seal connector by arraying a dummy conductor outside the row of circuit connecting conductors, and forming a short conductor bar laterally extended from the dummy conductor. CONSTITUTION:In aligning a heat seal connector 14 with a mating electrode terminal or the like on a printed circuit board for connection, a T-shaped section formed with a dummy conductor 18 and a conductor bar 19 is superposed on a corresponding mating T-shaped section. In this case, even when a connector 14 is superposed, an alignment T-shaped mark on the printed circuit board must be visible through the connector 14. For this purpose, hot melt resin 20 is so applied to the surface of the bar 19 and the vicinity thereof as to have a cutout shape, in order to make the bar 19 visible. Furthermore, the dummy conductor 18 is extended to the edge of a layer 20, and the conductor 18 located at the edge is used for alignment. A dummy terminal is fitted as mentioned, and only conductors arrayed inside thereof are used for the electrical connection of circuits.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat seal connector, and more particularly to a heat seal connector which facilitates workability and enables highly reliable connection.

[0002]

2. Description of the Related Art A heat seal connector is shown in FIG.
A liquid crystal display element and a driver I for driving the same as shown in FIG.
It is used to electrically connect to C (not shown). In the figure, for example, ITO (Indium Tin Oxid) is formed on the end portion of the glass substrate 2 of the liquid crystal display element 1.
The electrode terminal 3 made of e) and the conductor 5 of the heat seal connector 4 are adhered onto the conductor 5 with a hot melt resin (not shown) in which a conductive material is dispersed and applied. On the other hand, the other end of the heat seal connector 4 is applied on the conductor 5 by matching the conductor 5 of the corresponding heat seal connector 4 to the electrode terminal group formed on, for example, a printed circuit board (not shown). It is bonded by the hot melt resin (Technical Report of IEICE Vol.
86, No. 211 (CPM86-66), pp. 49-54, '
86, magazine "Electronic Materials" February 1988, pages 37 to 4
Page 3, etc.).

[0003]

With the heat seal connector, for example, a liquid crystal display device and an IC for driving the liquid crystal display device are provided.
In order to electrically connect the electrode terminals on the printed circuit board on which is mounted, the conductor of the heat seal connector,
When aligning with the electrode terminals of the liquid crystal display element or the electrode terminals on the printed circuit board, the widthwise overlapping portions of the conductors of the heat-seal connector were observed with a magnifying glass. However, as the arrangement pitch of the conductors becomes narrower (for example, 0.35 mm or less) or the number of conductors increases, the margin for misalignment in the diagonal direction decreases, so the workability becomes extremely poor with the conventional alignment method. ..

One of the objects of the present invention is to provide a heat seal connector which improves the workability of connection of the heat seal connector and enables highly reliable connection.

[0005]

In order to achieve such an object, the heat seal connector according to the present invention is provided with a conductor originally necessary for electrical connection between circuits such as a liquid crystal display element and a driving IC. Then, an extra dami conductor is arranged on the outside of the array, a short conductor bar (bar) extending laterally from the dami conductor is formed on the outermost side, and the T-shaped portion formed here is aligned. It is characterized by making it available.

[0006]

The function of the damy conductor provided on the heat seal connector and the short conductor bar extending laterally from the damie conductor for aligning with the mating circuit to be connected to the heat seal connector,
Since it serves as a so-called "cross mark", the alignment can be achieved with good workability, and the connection is highly reliable.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is a perspective view of an embodiment of the heat seal connector according to the present invention. Heat seal connector 14
Is formed on a film substrate 16 made of, for example, 25 μm-thick PET (polyethylene terephthalate) with a width of 0.15 mm for connecting circuits and an arrangement pitch of 0.3 mm, graphite, carbon black, 20 made of silver powder
a conductor 15 having a thickness of μm, an adjusting conductor 17 arranged outside the conductor 15 and formed of the same material as the conductor 15, and arranged outside the adjusting conductor 17 and formed of the same material as the conductor 15. A dummy conductor 18 having a width of 0.15 mm, and a short conductor bar 19 integral with the dummy conductor 18 and extending in a direction substantially orthogonal to the extending direction of the conductor 15, for example, a conductor bar 19 having a width of 0.2 mm. , Conductor 15, adjusting conductor 17,
It consists of a hot-melt resin layer 20 which is applied on the dami conductor 18 and contains a conductive material in a dispersed manner. The hot melt resin layer 20 is provided with a window 30 that exposes the conductor bar 19. The hot-melt resin layer 20 is formed by printing in stripes on the conductor 15, the adjusting conductor 17, the damy conductor 18, etc. (in order to avoid complicating the drawing in FIG. 1). ,
In this area, the striped pattern is omitted, and the striped conductive material-containing hot melt resin layer does not exist.
It consists of two areas on which an insulating hot melt resin is printed. As another method, the hot melt resin containing the conductive material dispersed therein may be applied uniformly over the entire surface without forming a striped pattern.

To align the heat seal 14 with an electrode terminal or the like on the mating printed board to which the heat seal 14 is to be connected, the T-shaped portion formed by the dami conductor 18 and the conductor bar 19 should be aligned with the mating counterpart. Since the cross-shaped portion or the T-shaped portion is overlapped with each other, even when the heat-seal connector 14 is overlapped, the alignment cross-shaped or T-shaped mark portion on the printed circuit board side is passed through the heat seal 14. Must be visible In order to see the alignment mark on the other side in this way, the window 30 is provided, or the hot melt resin layer 20 on and near the conductor bar 19 is cut out so that the conductor bar 19 can be seen. It is necessary to. Further, the hot-melt resin layer 20 on the damy conductor 18 may be provided with a window portion or a cutout portion similar to the window portion 30. However, in FIG. 1, the damy conductor 18 is extended to the end face of the hot melt resin layer 20, and the damey conductor 18 at this end face portion is used for alignment. In FIG. 1, the circuit connecting conductor 15 is not extended to the end face of the hot melt resin layer 20 in order to prevent the conductor 15 from being exposed to the air and being deteriorated.

At the time of producing the heat seal connector 14, it is necessary to control the resistance value of the conductor 15 for circuit connection. Instead of measuring the resistance value of the conductor 15, two conductor bars exposed at the window 30 are used. The resistance value of the conductor 15 can be controlled by measuring the resistance between the 19 and the resistance value of the dami conductor 18. By this measurement, it is possible to exclude defective products of the heat seal connector.

FIG. 2 electrically connects the liquid crystal display element 1 to the electrode terminals 23 of the printed circuit board 22 on which the driver IC for driving the liquid crystal display element 1 is mounted by using the heat seal connector 14 described with reference to FIG. It shows an example.

In the figure, a glass substrate 2 of a liquid crystal display element 1 is shown.
A display electrode (not shown) of the liquid crystal display element 1 is provided at the end of
The electrode terminal 3 connected to the heat seal connector 14 and the T-shaped portion corresponding to the T-shaped portion formed by the damy conductor 18 and the conductor bar 19 of the heat-seal connector 14 are provided, and are normally made of the same material as the electrode terminal 3. The electrode terminal 21 is formed. On the other hand, the printed circuit board 22 is provided with an electrode terminal 23 for supplying a signal for driving the liquid crystal display element 1 to the liquid crystal display element 1, and further outside the drive voltage supply electrode terminal, a dummy conductor of the heat seal connector 14 is provided. A damey electrode terminal 24 having a T-shaped portion corresponding to the T-shaped portion formed by 18 and the conductor bar 19 is formed.

First, the liquid crystal display element 1 and the heat seal connector 14 are connected to each other by the dummy electrode terminal 21 of the liquid crystal display element 1.
The T-shaped part of the heat seal connector 14 is aligned with the T-shaped part formed by the conductor bar 19 and the T-shaped part of the heat-seal connector 14, and heated at about 180 ° C., for example.
Apply pressure to bond and fix. In this case, the conductor 15 is aligned with the width of the dummy conductor 18 in the width direction of the conductor 15 and the conductor bar 19 in the longitudinal direction.

Next, the dummy electrode terminal 2 of the printed circuit board 22
The T-shaped portion of No. 4 is aligned so that the T-shaped portion formed by the damy conductor 18 and the conductor bar 19 of the heat seal connector 14 is aligned, and heated at 180 ° C., for example.
Apply pressure to bond and fix.

In the heat seal connector 14 described with reference to FIG. 1, the adjustment conductor 17 is provided outside the conductor 15.
In general, when a heat-seal connector is used to fix the electrical connection, the resistance of the connecting portion tends to increase as the circuit connecting conductors are arranged on the outer side. Therefore, a so-called damy terminal, which is not used for connection between circuits, is provided, and only the conductors arranged inside the terminal are used for electrical connection between circuits. Therefore, in FIG. 1, only one adjusting conductor 17 is provided at each of the four corners of the heat seal 14, but if the number is increased, the resistance of the connecting portion by the conductor 15 can be made more uniform.

In FIG. 3, the liquid crystal display device 1 and the printed circuit board 22 as shown in FIG. 2 are electrically connected by the heat seal connector 14 according to the present invention and further combined with a light source to be compactly assembled as a liquid crystal display module. It is a thing. Among the electrode terminals of the liquid crystal display element 1,
As shown in FIG. 3, the electrode terminal on the side of the liquid crystal display element 1 which is not electrically connected by the heat seal connector 14 has a conductive elastic connector (carbon fiber) between this terminal and the corresponding electrode terminal on the printed circuit board 22. And a circuit on the printed circuit board 22 through a thin layer of conductive silicon rubber mixed with fine particles and a thin layer of insulating silicon rubber which are alternately laminated in multiple layers. Connected to each other.

The printed circuit board 22 connected to the liquid crystal display element 1 is fitted into the window portion of the frame-like body 42 formed by plastic molding, and the metal frame 41 is superposed on it.
The frame 41 is fixed to the frame-shaped body 42 by bending the claw 43 into the notch 44 formed in the frame-shaped body 42.

A cold cathode fluorescent lamp 36 disposed at the upper and lower ends of the liquid crystal display element 1, a light guide 37 made of an acrylic plate for uniformly irradiating the liquid crystal display element 1 with light from the cold cathode fluorescent lamp 36, A reflecting plate 38 formed by applying white paint to a metal plate, and a milky white diffusing plate 39 for diffusing light from the light guide 37 are fitted into the window portion from the back side of the frame-shaped body 42 in the order of FIG. Be done. An inverter power supply circuit (not shown) for turning on the cold cathode fluorescent lamp 36 is located at a position (not shown) provided on the right back side of the frame-shaped body 42 and facing the recess 45 of the reflection plate 38. .). The diffusion plate 39, the light guide 37, the cold cathode fluorescent lamp 36, and the reflection plate 38 are the reflection plate 38.
It is fixed by bending the tongue piece 46 provided in the inside of the small opening 47 provided in the frame-shaped body 42.

[0019]

According to the present invention, when the circuits are connected by the heat seal connector, the circuit and the heat seal connector can be aligned with each other with good workability and high reliability.

[Brief description of drawings]

FIG. 1 is a perspective view of essential parts showing an embodiment of a heat seal connector according to the present invention.

FIG. 2 is a perspective view of relevant parts for explaining an example of electrical connection between a liquid crystal display element and a printed circuit board by a heat seal connector according to the present invention.

FIG. 3 is an exploded perspective view of a main part of a liquid crystal display module in which a liquid crystal display element and a printed circuit board connected by a heat seal connector according to the present invention are further combined with a light source.

FIG. 4 is a perspective view of a main part for explaining a connection between a conventional heat seal connector and a liquid crystal display element.

[Explanation of symbols]

1 ... Liquid crystal display element, 2 ... Glass substrate, 3 ... Electrode terminal, 1
4 ... Heat seal connector, 15 ... Conductor, 17 ... Adjustment conductor, 18 ... Damily conductor, 19 ... Conductor bar, 20 ... Hot melt resin layer, 22 ... Printed circuit board, 23 ... Signal supply electrode terminal, 24 ... Damily electrode terminal , 30 ... Window.

Claims (1)

[Claims] 1. A heat seal connector comprising a base film, a conductor for circuit connection, and a hot-melt resin layer laminated on each other, wherein damy conductors are arranged outside the array of conductors for circuit connection, and laterally from the damy conductor. A heat-seal connector, wherein a short conductor bar extending is formed.