Chain wheel tooth hole of COF product

Abstract

The invention discloses a chain wheel tooth hole of a COF product. The COF product is a long strip-shaped coiled material, and comprises a wiring pattern effective area and chain wheel tooth holes which are formed in the two sides of the wiring pattern effective area and are symmetrically distributed. When the width A of the COF product is 35mm, the screw pitch B of the chain wheel tooth holes is32-34mm. The distance E from the chain wheel tooth holes to the edge of the COF product is 0.5-1.0mm. The distance F between the chain wheel tooth holes is 32-34mm. The distance J of the wiring pattern effective area is 28-30mm. The advantage is that the available area of the COF product is increased because of the reduction of the distance from the chain wheel tooth hole to the edge of the COF product, the reduction of the size of the chain wheel tooth hole and the change of a square hole into the round hole, so that the utilization rate of the COF product is increased, the manufacturing costof the COF product is reduced, and greater competitive advantages are obtained.

Description

technical field [0001] The invention relates to a sprocket tooth hole of a COF product, and belongs to the technical field of COF product manufacturing. Background technique [0002] On the existing roll-type COF products, the same wiring pattern is transported to a specified length each time during exposure, and the identification device identifies the sprocket hole for positioning, and then develops, etch, and removes the film, and repeats the sequence in the MD direction. The above wiring pattern After being mounted on the semiconductor chip, it is transported along the MD direction at a specified length and positioned sequentially. The specified length is transported during stamping. The sprocket holes are identified by the identification equipment outside the stamping area, and COF is punched out for each individual wiring pattern. Here's how to make COF. [0003] The size and position of sprocket holes in traditional COF products are defined as shown in Table 1 and Ta...

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problem of cost increase due to occurrence of unnecessary regions as described above, when wiring patterns have protrusions, adjacent wiring patterns are a method of arranging protrusions near each other to reduce the area of ​​unnecessary regions

[0009] The existing traditional sprocket tooth hole is designed as a square hole. Since the four corners of the square hole are set at right angles for subsequent positioning, it is easy to cause the substrate to tear during transportation and use. Therefore, the right angle of the square hole is changed to an R angle, which causes waste of area. The effective area of ​​the wiring pattern of COF products is reduced, so the utilization rate of COF products is reduced and the cost is increased

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