JPS63190672A - Solder coater - Google Patents

Abstract

PURPOSE:To enhance the releasability of a photosensitive liquid and to stabilize the transfer thickness of said liquid, by providing a control apparatus for lining the surface of a coating roll by a Teflon impregnation layer and controlling the supply thickness of the photosensitive liquid. CONSTITUTION:A coating roll 2 is constituted by covering the surface of a hollow cylindrical body with a Teflon impregnation layer having a thickness of about 15mum. In order to control the supply thickness of a photosensitive liquid, a coating roll, a doctor roll or a jet cylinder for injecting a jet stream is used. For example, in the case using the doctor roll 6, when the photosensitive liquid R is supplied to the nip between the coating roll 2 and the doctor roll 6, the photosensitive liquid R' can be adhered to a printed circuit board 1 in the desired thickness corresponding to the desired gap between rolls 6, 2 adjusted by a moving lever 7. In this case, the Teflon impregnation layer is also formed to the surface of the doctor roll 6.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a coating device for coating the surface of a printed circuit board with a photosensitive liquid, and more specifically to a coating device for coating a printed circuit board with a desired pattern. The present invention relates to a solder coater that coats the surface of a substrate (patterned substrate) with a photosensitive liquid having a desired contact-resistant thickness.

[Conventional technology]

As shown in FIG. 6, in the conventional solder coater, when applying the photosensitive liquid R to the surface of the printed circuit board 1, the photosensitive liquid R in the liquid storage tank 3 is deposited on the coating roll 2, and this adhered liquid R is applied.
' was transferred onto the surface of the substrate 1 to form a coated substrate. Note that in the drawings, reference numeral 4 indicates a support roller, and reference numeral 5 indicates a conveyor roller.

[Problem that the invention seeks to solve]

Coating substrates formed with conventional solder coaters require repeated coating several times to obtain a coating thickness that is sufficient to strengthen the corrosion resistance that accompanies the miniaturization of patterns on the substrate.

As for the desired touch-resistant thickness, the coating thickness of the photosensitive liquid is currently 30~30~
However, with conventional solder coaters, the maximum coating thickness in one application is approximately 5 to 10μ even if the photosensitive liquid is maintained at an optimum level (temperature, line layer, etc.). there were.

The reason for this is that conventional coating rolls are made of rubber or ethylene propylene rubber, etc., and are resistant to polar solvents such as ketones and esters, and have good ozone resistance. It was said to have a similar structure.

[Means to solve the problem]

The inventors of this application have discovered that the conventional solder coater
It was learned that the reason why the maximum coating thickness was about 5 to 10 microns per coat was due to poor peelability of the photosensitive liquid from the coating roll. This invention has devised a solder coater equipped with a coating T whose coating means is optimized.

The basic structure of the coating roll according to the present invention will be explained with reference to FIG. 1 as follows.

The coating roll 2 has a structure in which the surface of a hollow cylindrical body 21 is coated with a Teflon-impregnated layer 22. The hollow cylindrical body 21 is made of a metal material such as stainless steel, and the Teflon-impregnated layer 22 is formed by applying a metal plate 23 to the surface of the metal material 21, as shown in the same enlarged view (represented by the symbol ■). It has a structure in which Teflon material is impregnated into the micropores on the metal plated surface. The thickness of the Teflon impregnated layer is approximately 1
It is formed to have a thickness of about 5μ.

[For production]

Since the coating roll according to the present invention has a structure in which the roll surface is coated with a Teflon-impregnated layer, the surface is extremely smooth and the separation property with the photosensitive liquid is extremely good. Furthermore, since the coating roll is a good conductor of heat, heat management is easy and it also has good heat resistance.

〔Example〕

Embodiments according to the invention are shown individually in FIGS. 2 through 5, respectively. Note that the same reference numerals in the drawings indicate members having the same effect as those described above.

In the embodiment shown in the second figure, a photosensitive liquid R is supplied between a coating roll 2 and a doctor roll 6, and the photosensitive liquid R' is applied to a desired thickness on a printed circuit board l.

Note that 8 is a photosensitive liquid tank, and 7 is a rod for moving the doctor roll 6, which is operated by a handle 71 to adjust the gap C between both rolls as desired. Furthermore, a Teflon-impregnated layer is formed on the surfaces of both the coating roll 2 and the doctor roll 6.

The photosensitive iR supplied between the coating roll 2 and the dog crawl 6, which maintain a desired gap C, causes the coating roll 2 to pass between the two rolls rotating at approximately the same circumferential speed.
Deposit on top to desired thickness. At this time, since the diameter of the coating roll is made larger than the diameter of the doctor roll, the amount of photosensitive liquid transferred to the doctor roll is extremely small and does not affect the amount of adhesion to the coating roll.

The photosensitive liquid deposited on the coating roll 2 is transferred onto the printed circuit board 1 that is conveyed between the roll 2 and the support roller 4, and the substrate 1 is coated with the photosensitive liquid R' of a desired thickness.

The embodiment shown in the third figure employs a spray barrel 9 in place of the doctor roll 6 in the previous embodiment, and the supply amount C of the photosensitive liquid is effected by swinging the spray barrel 9.

Furthermore, air from the air conveying device 94 is fed into the injection cylinder under pressure and is ejected from the tip port as a jet stream.

The injection cylinder 9 is formed to have a rectangular cross-section with approximately the same length as the coating roll 2, and is fixed to be swingable by shafts 93 on both sides. Moreover, the jet port 90 at the tip is hinged 9
2) so that it can be adjusted at will by means of a rapidly moving spine 91. In addition, a Teflon-impregnated layer having the same function as the coating roll surface is formed on the upper surface of the spray barrel 9' which comes into contact with the photosensitive liquid. Note that 94 indicates a blower pump.

The injection tube 9 formed in this manner allows the supply gap C of the photosensitive liquid to be adjusted arbitrarily. Moreover, the photosensitive iR adhered to the surface of the coating roll 2 is shielded from the outside air by a jet stream ejected from the spray cylinder at approximately the same speed as the circumferential speed of the roll 2, and is maintained in a good adhesion state and transferred onto the printed circuit board. Then, the substrate 1 is coated with a photosensitive liquid R' of a desired thickness.

In the embodiment shown in FIG. 4, a photosensitive liquid R is filled into a spray tube 9, and this photosensitive liquid is forcedly fed by air A from a blower pump 94 to deposit it on the coating roll 2 to a desired thickness. is transferred onto the printed circuit board 1.

In the case of this embodiment, since the extrusion action is performed with a uniform pressing force on the photosensitive liquid in the injection cylinder, the extrusion can be accurately controlled to a desired thickness and length. Note that 95 indicates an air supply pipe, and 96 indicates a filling port for photosensitive liquid.

In the embodiment shown in FIG. This is a system in which photosensitive liquid R is stored and new liquid is not replenished until this photosensitive liquid R is consumed, and in this case, it is possible to prevent excessive adhesion to the coating roll, which tends to occur in the gravity flow system.

In addition, the diameter of the coating roll 2 in each of the above embodiments is preferably 100*1 or more, and 1
The maximum transfer layer of photosensitive liquid per cycle can be 60μ. Further, the transfer thickness can be further increased by attaching a temperature adjustment device to each of the above-mentioned members so that the temperature of the coating roll 2) doctor roll 6 or jetted air stream corresponds to the optimum temperature of the photosensitive liquid.

〔Effect of the invention〕

Since the coating roll according to the present invention has the roll surface lined with a Teflon-impregnated layer, the photosensitive liquid attached to this surface is completely peeled off from the roll surface when transferred onto the printed circuit board, and the photosensitive layer of the desired thickness is applied to the printed circuit board. The surface can be coated.

Furthermore, the present invention can control the temperature of the supplied photosensitive liquid using coating rolls, doctor rolls, or shared airflow, and does not require means for causing property changes such as re-kneading the supplied photosensitive liquid. Due to this property change, the photosensitive liquid does not flow down during adhesion or remain on the roll surface after transfer.

In particular, when a jet stream is emitted by the ejection tube, the adhered photosensitive liquid is conveyed to the transfer position by the jet stream, so that the transferred thickness of the photosensitive liquid can be stabilized.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the main parts of the coating roll according to the present invention, with a part enlarged (see the circle indicated by the symbol ■).
FIGS. 2, 3, 4, and 5 each show an embodiment of the present invention as an independent device, and each is an explanatory cross-sectional view of a main part. FIG. 6 is an explanatory diagram of a conventional example. Symbols in the drawings are: 1; Printed circuit board 2; Coating roll 4; Support roller 5; Conveyor roller 6; Doctor roll 7; Doctor roll moving rod 8; Photosensitive liquid tank 9; Spray tube 91; Spine piece 92; Hinge 93; Axis A; air flow C; gap (thickness of photosensitive liquid flowing down); R; photosensitive liquid R1; transfer liquid. Patent applicant: M-Nico Co., Ltd. Patent attorney Sada Otsuka Figure 5

Claims (3)

[Claims] (1) Consists of a printed circuit board conveyance device, a coating roll that transfers photosensitive liquid onto the printed circuit board conveyed by this conveyance device, and a control device that controls the supply thickness of the photosensitive liquid supplied to this coating roll. A solder coater characterized in that the coating roll surface is formed with a Teflon-impregnated layer. (2) A solder coater according to claim 1, characterized in that the solder coater is constituted by a doctor roll having a surface having the same effect as the coating roll, which is equipped with a position moving device as a control device. (3) The solder coater according to claim 1, which has a position moving device as a control device, and is constituted by an injection cylinder formed to introduce an air flow into the interior and jet the air flow to the outside. A solder coater characterized by: