JPS61189545A - Liquid resist coating roller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] The present invention relates to an improvement in a liquid resist coating roller provided in a resist coating device with 11 points, which coats a liquid resist onto a printed circuit board while rolling over the substrate.

The liquid resist application roller according to the present invention is characterized in that the resist supply groove provided on the outer peripheral surface of the roller is formed in a spiral groove shape, and the liquid resist adhered to the outer peripheral surface of the application roller is As the coating roller rotates, it is sent in the pitch direction of the spiral resist supply groove and the resist is coated while successively contacting the printed circuit board surface, which has the advantage that uneven coating does not occur.

[Industrial application field]

Recently, printed circuit boards have become larger and larger, and the density of component mounting has also increased. Therefore, along with the demand for improved wiring pattern accuracy, quality requirements regarding resist coating accuracy in the resist coating process, especially regarding "coating unevenness", have increased. It's getting tougher.

The present invention relates to a resist coating roller for preventing uneven coating, which was developed to meet the above-mentioned needs.

[Conventional technology]

FIG. 2 is a perspective view of main parts showing an example of the structure of a conventional resist coating section, FIG. 3(a) is a schematic diagram showing the form of resist supply grooves formed on the outer peripheral surface of the coating roller, FIG. 3 is a cross-sectional view of a main part showing an example of the shape of a groove.

As shown in FIG. 2, the resist coating section of the apparatus contacts the M board 2 (the board conveying roller 1 rotates in the direction of the arrow and conveys the printed circuit board 2 in the direction of arrow B, and the printed circuit board being conveyed). The liquid resist 5 is applied to the substrate 2 while rotating in the direction of arrow A.
The resist supply nozzle 6 includes a resist application roller 3 that applies liquid resist 5, and a resist supply nozzle 6 that supplies liquid resist 5 between the application roller 3 and the driven roller 7.

The driven roller 7 is in contact with the outer circumferential surface of the resist coating roller 3, and while rotating following the roller 3, the liquid resist 5 is rolled to a uniform thickness and adhered to the outer circumferential surface of the coating roller 3.

Then, the resist application roller 3 transfers the resist 5 adhered to the outer circumferential surface by the above-mentioned means onto the printed circuit board 2 by pressing the resist 5 into contact with the printed circuit board 2 .

The resist coating roller 3 is formed with a plurality of parallel independent grooves 4a as resist supply grooves 4 as shown in FIG.
is pushed out by the aforementioned pressure contact between the coating roller 3 and the substrate 2, and is transferred and coated onto the printed circuit board 2 side.

FIG. 3 is a cross-sectional view showing an example of the shape of resist supply grooves 4 provided on the outer circumferential surface of the resist coating roller 3, and the supply grooves 4 are arranged parallel to each other at equal intervals and centered around the center 0 of the coating roller 3. Multiple strips are formed concentrically around the center.

The resist coating roller 3 is generally made of an elastic material and a material that blends well with the resist 5, such as butyl rubber.

[Problem that the invention seeks to solve]

However, as explained in FIG. 3(a), the resist supply grooves 4 of the conventional resist coating roller are formed of concentric parallel independent grooves 4a, so that on the printed circuit board 2, the resist supply grooves 4 are formed to the left and right of the resist 5. Since almost no flow occurs, there is a difference in the amount of resist 5 applied to the substrate 2 between the grooves, ie, recesses, and the surface, ie, protrusions, resulting in uneven coating 8 in a vertical striped pattern on the surface of the substrate 2. Furthermore, the coating unevenness 8 indicates the density of the adhesion thickness of the resist 5, and the flatness of the resist film is poor, which not only reduces the pattern accuracy but also poses a risk of developing a resist film peeling accident. .

The present invention has been made in order to avoid the above-mentioned uneven coating phenomenon, which is the biggest problem during resist coating.

[Means for solving problems]

The above problem can be solved by providing a liquid resist coating roller characterized in that the resist supply groove provided on the outer peripheral surface of the coating roller is formed in a continuous spiral groove shape.

[Effect]

In the liquid resist application roller of the present invention, the resist supply groove on the outer peripheral surface is formed in a spiral shape, so that the resist flows to the right or left on the surface of the printed circuit board (the direction of movement is determined by the direction in which the spiral is formed). Since the coating is applied while the coating is being applied, the occurrence of uneven coating can be accurately prevented.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a diagram showing an embodiment of a liquid resist application roller according to the present invention, in which (a) is a perspective view, and (b) is a schematic diagram showing the form of resist supply grooves formed on the outer peripheral surface of the application roller. It is a diagram.

Note that the same reference numerals indicate the same objects throughout the figures.

As shown in FIG. 3(a), the resist coating roller 3 of the present invention is characterized in that the resist supply groove 4 is formed into a continuous spiral groove 4b starting from point 8 and ending at point E, for example. be.

Therefore, the resist applied by the resist coating roller 3, which contacts the printed circuit board 2 being conveyed in the direction of arrow B and rotates in the direction of arrow A'', flows in the direction of arrow C along the spiral continuous groove 4b. However, since it is applied to the printed circuit board 2, uneven coating does not occur.

The spiral continuous groove 4h is connected to the coating roller 3 as shown in the same figure (bl).
are spirally formed at equal intervals on the outer circumferential surface of , and the cross-sectional shape is the same as that shown in FIG. 3(b).

It goes without saying that the spiral forming direction of the spiral continuous groove 4b, the positions of the starting point S and the ending point E, etc. may be determined as appropriate depending on the layout of the device.

〔Effect of the invention〕

As explained above, the liquid resist application roller according to the present invention has a structure in which the resist is evenly adhered to the printed circuit board by the spiral continuous groove provided on the outer peripheral surface of the roller, and therefore has the effect of accurately preventing uneven application. It is something of a similar magnitude.

[Brief explanation of drawings]

FIGS. 1(a) and 1(bl) are views showing one embodiment of a liquid resist coating roller according to the present invention, f8 is a perspective view, and FIG. 1(b) is a resist supply groove formed on the outer peripheral surface of the coating roller. FIG. 2 is a perspective view of a main part showing an example of the structure of a conventional resist coating section; FIG. 3 is a diagram showing the groove shape of a conventional resist coating roller; (Al is a schematic diagram showing the form of the resist supply groove formed on the outer peripheral surface of the coating roller, (
b) is a sectional view of a main part showing an example of the shape of a resist supply groove. In the figure, 1 is a substrate conveyance roller, 2 is a printed circuit board, 3 is a resist coating roller, 4 is a resist supply groove, 4a is a parallel independent groove, 4b is a spiral continuous groove, 5 is a liquid resist, and 6 is a resist supply nozzle. , 7 is a driven roller, 8 is uneven coating,
O indicates the center of the application roller, S indicates the start point of the spiral continuous groove, and E indicates the end point. (Q) (b) Figure 1.1. Above all, I will strike Pr * /1j! km i row 2nd figure 4 mao 4 inmo 0-rai i nose shaped fox figure 3

Claims (1)

[Claims] A coating roller of a resist coating device that transfers and coats a liquid resist onto a printed circuit board, wherein a resist supply groove provided on an outer peripheral surface of the resist coating roller is formed in a spiral continuous groove shape. A liquid resist coating roller characterized by: