JPH0479475U

JPH0479475U -

Info

Publication number: JPH0479475U
Application number: JP12216290U
Authority: JP
Priority date: 1990-11-20
Filing date: 1990-11-20
Publication date: 1992-07-10

Description

[Brief explanation of the drawing]

図はこの考案の実施例を示す図で、第１図は保
護膜の窓の隅部に設ける円弧の説明図、第２図は
露出パターンの隅部に設ける円弧の説明図、第３
図はズレがないときの露出パターンと保護膜の窓
の位置関係を示す図、第４図は最大ズレが生じた
ときの問題点の説明図、第５図は従来装置におけ
る問題点の説明図、第６図はパターン間隙と最大
ズレ量の関係を説明した図である。図中、１……露出パターン、２……保護膜、３……窓
、４……被覆パターン、１２……露出パターンの
隅縁、３１……窓の隅縁、ａ……ソルダーレジス
トの許容最大ズレ量、ｃ……余裕露出寸法、Ｒ…
…隅縁３１の半径。 The figures show an embodiment of this invention, in which Fig. 1 is an explanatory diagram of arcs provided at the corners of the window of the protective film, Fig. 2 is an explanatory diagram of the arcs provided at the corners of the exposed pattern, and Fig. 3 is an explanatory diagram of the arcs provided at the corners of the exposed pattern.
The figure shows the positional relationship between the exposed pattern and the window of the protective film when there is no misalignment, Figure 4 is an explanatory diagram of the problem when the maximum misalignment occurs, and Figure 5 is an explanatory diagram of the problem with the conventional device. , FIG. 6 is a diagram illustrating the relationship between the pattern gap and the maximum deviation amount. In the figure, 1... exposed pattern, 2... protective film, 3... window, 4... covering pattern, 12... corner edge of exposed pattern, 31... corner edge of window, a... solder resist tolerance Maximum deviation amount, c... margin exposure dimension, R...
...Radius of corner edge 31.

Claims

[Claims for Utility Model Registration] (1) The edges 31 at the four corners of the window 3 provided to expose the conductive patterns 1 and 4 on the protective film 2 are located between the conductive patterns 1 and 4 and the protective film during printed board manufacturing. It is characterized by having an arcuate shape with the same radius that is equal to or larger than the sum of the maximum allowable deviation amount a from the window 3 and the minimum value c of the allowable exposure dimension around the exposure pattern 1,
printed board. (2) The edges 31 at the four corners of the window 3 provided to expose the conductive patterns 1 and 4 on the protective film 2 are in the shape of an arc according to claim 1, and the edges 12 at the four corners of the exposed pattern 1 are the same as those of the window. 2. The printed board according to claim 1, wherein the printed board has an arcuate shape with the same radius equal to or larger than the radius R of the corner edge 31 minus the minimum value c of the margin exposure size around the exposure pattern 1.