JPH0563868U - Metal mask - Google Patents

Abstract

(57) [Summary] [Purpose] To objectively judge the cleaning timing when the metal mask is clogged. [Structure] In addition to an opening 4 for printing cream solder on a metal 3 of a metal mask 1, a triangular opening 6 for determining a cleaning time is formed. The triangle apex 6B is arranged so as to face the moving direction 7 of the brush 5. By observing the clogging state of the opening 6, the cleaning time of the metal mask 1 can be objectively determined.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a metal mask used for printing cream solder at a predetermined position on a board surface for soldering a component.

[0002]

[Prior Art]

 Substrates are used to incorporate components into various electronic devices, but recently, surface mounting technology that mounts components on both sides of the substrate has been widely implemented.

FIG. 4 is a cross-sectional view for explaining such surface mounting technology. Land patterns 11A to 11F are formed in advance at predetermined positions for soldering the components on both the front surface 10A and the back surface 10B of the substrate 10. Parts are soldered to the land pattern. For example, the chip resistor 12A is soldered between the land patterns 11A and 11B, the chip capacitor 12B is soldered between the land patterns 11B and 11C, and the IC 12C is soldered between the land patterns 11D and 11E. A chip resistor 12D is soldered between 11E and 11F.

By surface-mounting the respective components in this manner, since the components can be mounted by using both surfaces 10A and 10B of the substrate 10, the mounting density can be significantly improved. In mounting each component between each land pattern in this way, cream solder is printed in advance at a predetermined position of each land pattern using a metal mask. In FIG. 4, 13 indicates a cream solder used for soldering each component.

FIG. 5 shows a metal mask 1 used for printing the cream solder 13 as described above. In this metal mask 1, a metal 3 such as stainless steel is arranged in a rectangular frame 2. An opening 4 is formed at a predetermined position where the cream solder 13 of the metal 3 is printed on the substrate surface. In order to make the explanation easy to understand, when an example of printing cream solder for soldering the chip resistor 12A on the predetermined positions of the land patterns 11A and 11B on the surface 10A of the substrate 10 in FIG. 6 is shown, the opening 4 of the metal mask 1 is shown. Is formed in the area necessary to print the cream solder.

In order to print the cream solder 13 using this metal mask 1, as shown in FIG. 7, the openings 4 are respectively positioned on the land patterns 11 A and 11 B on the surface 10 A of the substrate 10. With the metal mask 1 positioned and the metal 3 in contact with the land patterns 11A and 11B, cream solder 13 is supplied to, for example, the left end of the metal 3 and the brush 5 called a squeegee is moved in the direction of arrow 7 (in this case, right). By moving (in the direction), the cream solder 13 is printed through the openings 4 on the predetermined positions of the land patterns 11A and 11B with an appropriate amount of soldering.

Here, as the number of times the metal mask 1 is used increases, the cream solder 13 is clogged in the opening 4 and gradually clogs from the corner 4A as shown in FIG. An appropriate amount is supplied for soldering by cleaning and removing clogging.

[0008]

[Problems to be solved by the device]

 By the way, in the conventional metal mask, since the cleaning time for removing the clogging varies depending on the operator, there is a problem that the amount of cream solder to be printed tends to vary.

The present invention has been made to address the above problems, and an object thereof is to provide a metal mask whose cleaning time can be objectively determined.

[0010]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention is a metal mask having an opening for printing cream solder by moving a brush at a predetermined position on a substrate surface for soldering a component, the metal mask being separate from the opening. It is characterized in that a triangular opening is formed to determine the mask cleaning time, and the apex of the triangle is directed in the moving direction of the brush.

[0011]

[Action]

 In addition to the opening for printing cream solder on the metal mask, a triangular opening is formed so that the cleaning timing can be determined by this opening. Can be objectively determined from.

[0012]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing an embodiment of a metal mask of the present invention, in which a metal 3 arranged in a rectangular frame 2 of the metal mask 1 is provided with an opening 4 for printing cream solder on the substrate surface. Separately from this, a triangular opening 6 for determining the cleaning time is formed, and the apex 6B of the triangle of the opening 6 is formed so as to face the brush moving direction 7.

As shown in FIG. 8, when the brush is moved in the arrow direction 7 to print the cream solder 13 in the opening 4, the cream solder 13 is clogged from the corner 4 A of the opening 4. As shown in FIG. 2, the opening 6 for determining the cleaning time in the triangular shape is also clogged from the corner 6A and the apex 6B.

Therefore, the timing of cleaning the metal mask 1 can be objectively determined by checking the clogging dimension x from the apex 6B of the triangle that is particularly easy to observe. In this case, the angle θ of the apex 6B of the triangle of the opening 6 is set to 25 to 45 ° as an example, and the width dimension (length in the moving direction 7 of the brush) is set to about 3 mm.

According to the present embodiment as described above, the cream solder 13 is actively clogged along the moving direction 7 of the brush from the apex 6 B of the triangle of the opening 6, and the clogging dimension x 1 is set. By checking, it becomes possible to objectively determine the cleaning time of the metal mask 1. Therefore, it is possible to prevent the defect that the cleaning time varies depending on the operator, so that the amount of cream solder to be printed does not vary.

The triangular shape of the opening 6 may be arranged in the opposite direction to that shown in FIG. 2, as shown in FIG. In short, it is sufficient that the direction of the apex 6B of the triangle coincides with the moving direction 7 of the brush, and the arrangement is such that the cream solder 13 is actively clogged when the cream solder 13 is printed.

As another embodiment of the present invention, the clogging state in the opening 6 shown in FIG. 2 or 3 is monitored by, for example, a CCD camera, and the area of the opening 6 is taken as a standard, for example, x / a value. You can determine the cleaning time by checking the above.

The clogging of the cream solder is determined by the conditions such as the viscosity of the solder, the pressing pressure of the brush, the shape of the opening, etc. Since the cleaning timing is determined, it is possible to objectively determine the cleaning timing no matter what condition causes clogging. The number and position of the triangular openings 6 are not particularly limited and can be set arbitrarily.

[0019]

[Effect of the device]

 As described above, according to the present invention, since the opening for determining the cleaning timing is formed in the metal mask, the cleaning timing can be objectively determined from the clogging of the opening. it can.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a metal mask of the present invention.

FIG. 2 is an enlarged view showing a main part of FIG.

FIG. 3 is an enlarged view showing a main part of FIG.

FIG. 4 is a cross-sectional view showing a surface mounting technique.

FIG. 5 is a plan view showing a metal mask used for surface mounting technology.

FIG. 6 is an explanatory diagram of a printing method using a metal mask.

FIG. 7 is an explanatory diagram of a printing method using a metal mask.

FIG. 8 is an enlarged view showing a clogging state of a metal mask.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal mask 3 Metal 4 Opening for cream solder printing 5 Brush (squeegee) 6 Opening for judging cleaning time 10 Substrate 11A to 11F Land pattern

Claims (1)

[Scope of utility model registration request] 1. A metal mask having an opening for printing cream solder by moving a brush at a predetermined position on a substrate surface for soldering a component, the cleaning time of the metal mask being determined separately from the opening. A metal mask, characterized in that a triangular opening for forming is formed, and the apex of the triangle is directed in the moving direction of the brush.