JPH0126413Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a substrate to be outsert molded, and particularly to a prepared hole shape that reduces deformation of the substrate and the ribs to be molded.

[Prior art]

In conventional outsert molding, the substrate on which ribs are formed has a round hole or a long hole 2 in the substrate 1 as shown in Figures 1 to 3. Due to the difference in rate, when forming the ribs 3 of resin, the linear expansion coefficient of the resin is larger, and contraction corresponding to the temperature difference between the molding temperature and room temperature occurs, causing the rib portion to shrink more than the substrate, but the substrate is usually pressed. Since the surface roughness of the fractured surface of the press hole is large in many cases, the resin gets into this part, making it difficult for the rib to shift in the longitudinal direction, resulting in the disadvantage that the substrate and the rib are easily deformed toward the rib.

[Purpose of invention]

An object of the present invention is to provide a substrate for outsert molding that eliminates the drawbacks of the prior art.

[Summary of the idea]

In order to prevent deformation of the board, the shape of the pilot hole is formed with a slope that spreads toward the center of the rib to minimize the catching force of the resin in the pilot hole, and make it slippery,
By making the ribs easy to contract, relative displacement between the substrate and the ribs is caused, and the difference in shrinkage is absorbed.

[Example of idea]

An embodiment of the present invention will be described below with reference to FIGS. 4 to 6. A pilot hole 5 having an inclination of about 0.5 degrees and widening toward the center of the rib 6 is provided in the substrate 4 as a pilot hole for the rib 6 to be outsert molded. When the ribs 6 are molded, the pilot holes 5 have a slope, so that they can easily slide in the longitudinal direction of the ribs. For this reason, even if the surface roughness of the prepared hole 5 of the substrate 4 is large, the resin is less likely to be caught, and the difference in shrinkage can be absorbed. According to this embodiment, the prepared hole shape can be easily formed by press working, so that quality can be improved without increasing costs.

[Effect of idea]

According to the present invention, even if there is a difference in shrinkage rate between the substrate and the resin, deformation can be reduced simply by sloping the prepared hole, so there is no need to increase the bending strength of the substrate. Furthermore, since the strength of the substrate is strong, there is no fear that the ribs will break, and there are fewer restrictions on the shapes of the substrate and ribs. There is no need to improve the surface roughness of the board pilot hole, which improves performance and has economical effects.

[Brief explanation of the drawing]

Figure 1 is a conventional plan view, Figure 2 is A- of Figure 1.
A sectional view, Fig. 3 is a BB sectional view of Fig. 1, Fig. 4
The figure is a plan view of one embodiment of the present invention, FIG. 5 is a sectional view taken along the line CC in FIG. 4, and FIG. 6 is a sectional view taken along the line DD. 4... Board, 5... Pilot hole, 6... Rib.

Claims (1)

[Scope of utility model registration request] 1. A substrate for outsert molding in which ribs are formed on a substrate by outsert molding, characterized in that the rib pilot hole of the substrate has a shape with a slope that widens toward approximately the center of the rib.