JPS63202099A - Method of aligning electronic component - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a positioning method for positioning electronic components on a printed circuit board when a liquid crystal display element is connected to the printed circuit board.

(Prior Art) Recently, various liquid crystal display elements have been used in various electronic devices, and the liquid crystal display elements are usually electrically connected to a printed circuit board. To connect the liquid crystal display element to a printed circuit board, the electrode pattern provided on the liquid crystal display element and the conductor pattern provided on the printed circuit board are precisely aligned, and then both are anisotropically connected. Guide N1
I am trying to connect via 1.

By the way, conventionally, in order to align the electrode pattern of the liquid crystal display element and the conductor pattern of the printed circuit board, the coordinates of the electrode pattern and the conductor pattern are read separately using an optical means such as a camera, and the coordinates of the electrode pattern and the conductor pattern are read separately using an optical means such as a camera, and the coordinates of the electrode pattern and the conductor pattern of the printed circuit board are read separately. The liquid crystal display element has been positioned while correcting the amount of deviation between the electrode pattern and the conductor pattern.

However, according to such conventional methods, the coordinates of the electrode pattern of the liquid crystal display element and the conductor pattern of the printed circuit board are read in a separate process, and the read values of these coordinates are converted into the amount of positional deviation. Since the liquid crystal display board must be positioned first with respect to the printed circuit board, it is not only difficult to work, but also tends to cause a difference in W4 when reading the coordinates and when positioning the liquid crystal display element, making it difficult to set the positioning angle of 11 degrees sufficiently. The drawback was that it could not be improved.

(Problems to be Solved by the Invention) This invention was made based on the above circumstances, and its purpose is to To provide a method for positioning an electronic component in which the relative deviation of a substrate can be used as is as a positioning value to efficiently perform positioning without causing errors.

[Structure of the Invention (Means and Effects for Solving the Problems)] In order to solve the above problems, the present invention provides a pair of conductive patterns located close to both ends of the printed circuit board on which the conductive patterns are formed. A pair of markers are provided at positions close to both ends of the electrode pattern of the liquid crystal display element connected to the conductive pattern and partially facing the pair of through holes. A display element is disposed below the printed circuit board, and the exposed portion of the marker facing each of the through holes is optically detected, and adjustments are made based on these detected values to display the conductive pattern and the electrode pattern. This is to determine the connection position.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a liquid crystal display element 1 and a printed circuit board 2. As shown in FIG. Electrode patterns 3 are formed at a predetermined pitch over almost the entire length on the negative side of the liquid crystal display element 1 in the width direction. On both ends of this electrode pattern 3, the electrode pattern 3 is made of ITO.
At the same time as forming the film, rectangular markers 4 are formed of the same material as the electrode pattern 3.

On the other hand, conductive patterns 5 are formed on one side of the printed circuit board 2 at the same intervals as the N-tub patterns 3.

A pair of through holes 6.7 are bored on both sides of the conductive pattern 5, corresponding to the pair of markers 4 described above. Incidentally, in this embodiment, the marker 4 is located at one end 6a of the two ends 6a, 6b and 7a, 7b of the pair of through holes 6.7.

7a, and has a width smaller than the width λ5 of the through hole 6.7. Regarding the formation of the above-mentioned through-holes 6.7, first, a substrate with a shape that is sufficiently larger than the above-mentioned through-holes is formed on the substrate that is not covered with copper foil, which will become the conductive pattern 5, corresponding to the formation positions of the through-holes 6.7. Drill it in place. Next, copper foil is laminated on the surface of each of the perforated substrates to form a printed circuit board 2, and then a butter for forming the conductive pattern 5 and an inverted pattern of the pattern for forming the through holes 6.7 are printed with a resist. After baking, conductive pattern 5 and through holes 6.7 are obtained by etching. It is formed so as to be bordered by a frame 8 of copper foil.

By such processing, the position relative to the conductive pattern 5 can be matched with island precision, rather than directly drilling holes with a drill or the like in post-processing of the printed circuit board 2.

The liquid crystal display element 1 formed in this way is mounted on a printed circuit board 2.
To position the printed circuit board 2, first place the printed circuit board 2 in a fixed manner as shown in FIG. Place it below and slightly spaced apart.

Then, the XY table is moved to roughly position the liquid crystal display element 1 so that the pair of markers 4 provided on the liquid crystal display element 1 correspond to the pair of through holes 6.7 formed in the printed circuit board 2. At this time, an anisotropic conductor [19] is provided in the conductive pattern 5 of the printed circuit board 2.

Next, a pair of cameras 10 serving as optical means disposed above the printed circuit board 2 take images of the portions of the pair of through holes 6.7, respectively. The portions of these through holes 6.7 appear white because the marker 4 made of ITOIII reflects light more easily than the frame 8 and the background of the printed circuit board 2. Therefore, since the marker 4 can be distinguished from other parts by the camera 10, the degree of exposure of the marker 4 from each through hole 6.7 can be detected. The XY table is driven based on these detected values. That is, if the pair of markers 4 are misaligned with respect to the pair of through holes 6 as shown in FIG. 3, the sizes of the white portions will be different.

By making these sizes the same, the liquid crystal display element 1 and the printed circuit board 2 can be positioned closely in the R.

On the other hand, even if the conductive pattern 5 and the electrode pattern 3 have different sizes, the marker 4 visible through the pair of through holes 6.
By making the sizes the same, the liquid crystal display element 1 can be optimally positioned with respect to the printed circuit board 2. When the positioning of the liquid crystal display element 1 is completed, the printed circuit board 2 is lowered, and the conductive pattern 5 and the electrode pattern 3 of the liquid crystal display element 1 are electrically connected via the anisotropic conductor H9. be able to.

That is, if the liquid crystal display element 1 is positioned in this manner, by detecting the degree of exposure of the marker 4 from the pair of through holes 6.7, this detection signal is used as a positioning signal for the liquid crystal display element 1 with respect to the printed circuit board 2. Since it can be used as a tool, the positioning work can be performed with high precision.

[Effects of the Invention] As described above, in the present invention, a pair of through holes are formed in a printed circuit board, and a pair of markers are provided in a liquid crystal display element at intervals corresponding to the pair of through holes. The liquid crystal display element is positioned relative to the printed circuit board by detecting the degree to which the liquid crystal display element is exposed through the pair of through holes. Therefore, the amount of relative positional deviation between the liquid crystal display element and the printed circuit board can be measured, and the amount of movement during position correction can be reduced, so that positioning can be performed more accurately than in the past.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a schematic diagram of a liquid crystal display element and a printed circuit board, FIG. 2 is a schematic diagram of a liquid crystal display element when positioning it, and FIG. FIG. 3 is an explanatory diagram of the relationship with markers. 1...Liquid crystal display element, 2...Printed circuit board, 3...
- Electrode pattern, 4... Marker, 5... Conductive pattern, 6.7... Through hole, 8... Frame, 10... Camera.

Claims (1)

[Claims] A pair of through holes are formed at positions close to both ends of the conductive pattern of the printed circuit board on which the conductive pattern is formed, and a pair of through holes are formed close to both ends of the electrode pattern of the liquid crystal display element connected to the conductive pattern. A pair of markers are provided at positions partially facing the pair of through holes, and the liquid crystal display element is placed below the printed circuit board, and the amount of exposure of the markers facing each of the through holes is determined optically. A method for positioning an electronic component, comprising: detecting the detected values, and adjusting based on the detected values to determine a connection position between the conductive pattern and the electrode pattern.