JPH0114050Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a circuit board for an optical display element suitable for assembling a display device.

[Technical background of the invention]

Here, a conventional circuit board for an optical display element will be explained. Fig. 1 shows an embodiment of the circuit board of this invention.Using this figure, it will be explained that the conventional circuit board is designed so that, for example, a plurality of light emitting elements can be attached in a cross-shaped arrangement. A circuit wiring pattern is formed thereon, and only alignment marks 21, 22, and 23 are provided as reference marks. This alignment mark 2
Reference numerals 1, 22, and 23 denote dot-shaped copper points that are patterned at arbitrary locations within the substrate 1 parallel to or perpendicular to the center line at the same time as the circuit wiring pattern.

By the way, an optical display device has a cone-shaped opening facing each light emitting element in order to effectively display individual light from a plurality of light emitting elements arranged in a cross-shaped arrangement on a display surface. It is equipped with a reflector plate with a cross-shaped segment arrangement. This reflective plate is usually made of a resin plate and is adapted to be superimposed on the circuit board. In order to fit and fix the mounting pins attached to the lower surface of both ends of the reflector plate into this circuit board, there are shown in FIG.
Holes are drilled at positions 1 and 32.

Then, the eye alignment marks 21, 2
The positions of the marks 2 and 23 are optically detected, and the positions of the marks 31 and 32 are determined based on these positions, and holes are formed there with a drill or the marks 2 are
1, 22, and 23 as references, a microcomputer calculates the inclination and deviation when the circuit board is mounted on the pellet mount device, and determines the mounting position of the light emitting element on the wiring pattern of the circuit board.

[Problems with background technology]

In this type of optical display device, the size of the segment aperture of the reflector is usually formed at the bottom to be close to the size of the light emitting element, so that the reflector can be precisely attached to the circuit board. In order to superimpose and fix the light emitting elements in close contact with each other, the precision of the position of forming the drill holes in the circuit board and the precision of the position of mounting the light emitting element on the wiring pattern must be high. However, in the conventional technique, since the alignment marks 21, 22, and 23 are small dot-shaped copper dots, they tend to wear out during the device manufacturing process and lose their sharpness, thus losing their role as reference marks. Therefore, the drill hole and the position of the light emitting element mount cannot be determined with high precision, which causes a decrease in the yield of display devices.

Further, the alignment marks 21, 22, 2
Although we are trying to automate drilling hole drilling and mounting of light emitting elements using optical detection based on 3, the lack of sharpness of marks 21, 22, and 23 may hinder automation or cause malfunctions. There is a risk of producing a large amount of defective products.

Therefore, it is possible to easily obtain numerically the drilling hole position accuracy and light emitting element mount position accuracy by visual inspection in advance, and correct the amount of movement of the drill of the assembly equipment and the amount of movement of the light emitting element mount. I would like to do this, but the mark 21,
22 and 23 cannot satisfy such a request. Further, there are many other problems, such as that after drilling holes in the circuit board and mounting the light emitting elements, it is not easy to visually determine whether the positions have been correctly obtained.

[Purpose of invention]

The present invention provides a circuit board for an optical display element that solves the various problems of the conventional art.

[Summary of the idea]

The circuit board for an optical display element of the present invention includes a circuit board and an annular eccentricity check mark provided around the planned hole opening area of the board and having an inner diameter indicating a first reference value and an outer diameter indicating a second reference value. and a plurality of pairs of electrode pads formed on the substrate, each having a predetermined interval on one side of each electrode pad to which an optical display element pellet is attached among the pairs of electrode pads in order to determine a pellet attachment position. and notches formed in pairs, so that the positional accuracy of the hole to be formed in the planned hole opening area can be quantitatively confirmed from the reference value of the inner and outer diameters of the eccentricity confirmation mark. It is something to do.

[Example of idea]

An embodiment of this invention will be described below with reference to the drawings. As shown in FIG. 1, eccentricity check marks for drilling holes are provided on the circuit board 1 at positions 31 and 32, which are the planned drilling areas, and these positions are located on the reflector plate attached to the board 1 (see FIG. This is the position of the opening into which the mounting pin (not shown) is inserted. As shown in Figure 2, the shape of this mark is as follows: inner circumferences 311 and 321 with inner diameters (OF) indicating the first reference value and outer circumferences 31 and 321 with outer diameters (OG) indicating the second reference value.
It is an annular shape consisting of 2,322 pieces. For example, if the drill diameter (OE) of the NC hole 41 or 42 is set to 4, and the inner diameter (OF) of the eccentricity check mark 31 or 32 is set to the first standard value of 4.2, if the hole is drilled without touching this inner diameter, It can be easily determined visually that the deviation accuracy of this hole is 0.1 or less. In addition, if the outer diameter (OG), which is the second standard value of the eccentricity check mark, is set to 5, the pattern width of this mark is 0.4, and even if the hole is drilled into the inner diameter of the eccentricity check mark, it will be dug in. By visually measuring the pattern width of a portion, the amount of deviation within the range of deviation accuracy of 0.1 to 0.4 can be easily determined visually and quantitatively. Therefore, by correcting the amount of drill movement of the assembly device in accordance with the result of such prior visual value discrimination, subsequent drill holes can be formed accurately. on the other hand,
As for the electrode pads 5 and 6 that indicate the standard for attaching the optical display element pellet, as shown in an enlarged view in FIG. A pair of notches 71, 72 along one side with a predetermined interval
is provided. At this time, the optical display element pellet 10 is attached within the assumed side of the electrode pad 11, as shown by the dotted line in the figure. For example, the depth of the notches is about 0.5 mm, the interval between the notches is about 5 mm, and the angle of the notches is about 60° to 90°. In this case, since the notches are formed in pairs, by arranging the pellets in accordance with the notches, it is possible to attach the pellets to the substrate in a predetermined manner without causing any misalignment.

Furthermore, as shown in FIGS. 4A and 4B, L-shaped additional reference points 81 and 82 and circular additional reference points 9 are provided. Each of these additional reference points has a different shape, and each shape is formed to correspond to a pellet with a different luminescent color, so when placing pellets with multiple luminescent colors such as yellow and red, use this additional Each pellet can be attached in a predetermined manner without error and very easily in accordance with the shape of the reference point.

In addition, if the pellet placement position is misaligned, the notch allows you to easily visually determine that the pellet position is defective.
It is possible to prevent such defective products from being sent to the next assembly process.

In the embodiment described above, the eccentricity check mark is patterned at the time of circuit pattern formation to maximize positional accuracy. Further, it goes without saying that electrode pads having a deformed structure may be provided in accordance with the gist of this invention.

[Effect of idea]

In this way, in the circuit board of this invention, since the eccentricity confirmation mark is formed with the inner diameter indicating the first reference value and the outer diameter indicating the second reference value, it is possible to determine the degree to which the drill hole position is at the time of preliminary inspection. Misalignment can be easily visually confirmed quantitatively, and the amount of drill movement can be corrected. Therefore, the circuit board can be manufactured while maintaining the accuracy of the drill hole position thereafter. In addition, even after the holes are formed, the degree of misalignment of the holes for attaching the reflector plate can be visually confirmed quantitatively, allowing for easy and accurate removal of defective holes and ensuring accurate attachment of the reflector plate to the circuit board. I can often do what I'm supposed to do. Furthermore, the work can be done reliably as the optical display element pellet can be easily and accurately attached to the circuit pattern as specified, and this circuit board can be used as an optical display device with a well-structured structure and extremely good characteristics. The product can be obtained with good workability.

Furthermore, it also has the advantage that optical display element pellets having different luminescent colors can be mounted at predetermined positions without fail.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the circuit board of this invention, FIG. 2 is a plan view of an annular eccentricity check mark, and FIGS. 3 and 4 A and B are plan views of electrode pads provided with notches. 1... Circuit board, 31, 32... Annular eccentricity confirmation mark, 5, 6... Electrode pad, 71, 72...
Notches formed in the electrode pad, 81, 82, 9
...Additional reference point.

Claims (1)

[Scope of utility model registration request] a circuit board, an annular eccentricity check mark provided around the planned hole opening area of the board and having an inner diameter indicating a first reference value and an outer diameter indicating a second reference value; and a plurality of pairs formed on the board. a group of electrode pads, and a notch formed in a pair at a predetermined interval on one side of each electrode pad to which an optical display element pellet is attached among these pairs of electrode pads in order to determine the pellet attachment position. A circuit board for an optical display element, characterized in that the positional accuracy of the hole formed in the planned hole area can be confirmed quantitatively from the reference value of the inner and outer diameters of the eccentricity confirmation mark.