JPH0224125Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a squeegee, and more particularly to an improvement in a squeegee used to bring a negative film into close contact with a printed wiring board (hereinafter referred to as a substrate) on which a photosensitive film is crimped.

Generally, as shown in Figure 1, a substrate 1 and a negative film 2 are
In order to expose the sheets 3 in close contact with each other, a sheet 3 made of Mylar or the like is vacuum-suctioned from the exposure device 4 by reducing the pressure thereon, and then a squeegee 5 is used to remove any remaining air pockets inside the sheet 3.

However, in the conventional squeegee 5 shown enlarged in FIG. 2, (a) the handle part 6 is constructed with an elastic body 7 made of urethane or the like, so the elastic body 7 wears out during use; Abrasion debris scatters and deteriorates exposure accuracy. For this reason, conventional squeegees cannot be used for long periods of time. (b) Furthermore, the tip end of the elastic body 7 is worn out and deformed, making it impossible to remove air pockets remaining in the sheet 3 sufficiently. Therefore, exposure defects occur due to poor adhesion.

The present invention provides a squeegee that solves these conventional drawbacks.

According to the present invention, there is provided a squeegee characterized in that the raised part of the elastic plate which is raised on one side of the handle made of a thick plate is covered with a mesh-like synthetic resin sheet with low surface friction. It will be done.

Hereinafter, one embodiment of the present invention will be described in detail using the drawings.

Fig. 3 shows a squeegee 15 according to the present invention, which is made by cutting a thick plate of wood or aluminum, etc., and planting an elastic material 7 such as urethane on one short side of a handle 6 with chamfered edges. The surface is covered with a mesh-like sheet 8 made of Tetron or Teflon or the like with approximately 200 meshes centered on the surface 7a, and then the squeegee 1
form 5.

As described above, in the squeegee according to the present invention, the tip of the elastic body is covered with a mesh-like Tetron or Teflon sheet, so when squeezing the sheet that brings the substrate and negative film into close contact, the friction of the elastic body is reduced, and the elastic body is It is possible to improve the adhesion between the substrate and the negative film without causing scattering of wear debris or deformation due to wear of the body.

Thus, the turnaround time and defect rate are each approximately
A reduction of 30% can be achieved, which has great industrial value.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a conventional adhering means using a squeegee. FIG. 2 is a perspective view showing a conventional squeegee. FIG. 3 is a three-dimensional diagram showing the squeegee of the present invention. 1... Substrate, 2... Negative film, 3... Sheet, 4... Exposure device, 5, 15... Squeegee, 6
...Handle portion, 7...Elastic body, 8...Mesh sheet.

Claims (1)

[Scope of utility model registration request] In a squeegee used to bring photosensitive film and negative film into close contact, the embossed part of the elastic plate on one side of the thick plate handle is covered with a mesh-like synthetic resin sheet with low surface friction. A squeegee characterized by being coated.