Coating processes – Electrical product produced – Integrated circuit – printed circuit – or circuit board
Patent
1987-11-23
1989-10-03
Pianalto, Bernard
Coating processes
Electrical product produced
Integrated circuit, printed circuit, or circuit board
118503, 118731, 427209, 427384, B05D 512
Patent
active
048715840
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The invention concerns an apparatus for the coating on both sides of plates, in particular circuit boards with a photosensitive lacquer or another liquid coating material, which following its application to both sides of the circuit board, is dried.
The coating on both sides of circuit boards with a photosensitive lacquer is carried out at the present time in a highly efficient manner by the pouring of the lacquer by means of pouring machines. The boards are clamped into a transport slide in their lateral edge zones and transported through the pouring film of the pouring machine. The holding device holding the boards during the pouring process is kept out of the pouring film so that it does not come into contact with the photosensitive lacquer. The boards are then dried in a special dryer of a vertical configuration with the boards in the horizontal position and held by lateral board holders. In the upper turning points the board holders are turned around together with the boards. The reverse side is now on top and is transported through a second pouring machine and a second special dryer. After leaving the coating apparatus, the boards are moved into the copying chamber for further processing.
These known installations require in each case two pouring machines or coating devices and two special dryers. The installations are therefore expensive and require much space.
It is the object of the invention to provide an apparatus of the aforementioned type, which is simpler and less expensive to construct and to operate.
This object is attained in principle according to the invention by that the circuit board is initially transported through a coating device and coated on one side, then turned in the course of its subsequent travel and then coated on the other side, whereupon it is introduced into a common drying device, dried on both sides and finally moved out of said drying device.
The process and the apparatus to carry it out may be designed and effected in a number of ways.
According to a simple embodiment of the apparatus according to the invention, the circuit boards are introduced on one side of the conveyor into the apparatus and deposited therein on a movable board holder, which together with the circuit board is transported through the coating device and then moved to a turning device, turned around and passed through the same coating device, whereupon it enters a common drying device.
Another process with a modified apparatus is when the circuit board is introduced at one end of the conveyor and deposited on a movable board holder, which together with the circuit board is transported to a first coating device, then turned around in a turning device and transported to a second coating device, whereupon it is finally passed through the common drying device.
Obviously, other variants of the configuration and operation of such a coating apparatus are possible. In each case, additional savings in production costs and of energy in the operation of the different individual devices are obtained.
BRIEF DESCRIPTION OF THE DRAWINGS
In the drawings, two different embodiments of the apparatus according to the invention are shown.
FIG. 1 shows schematically in a top elevation a coating installation with lateral board introduction and one coating device, and
FIG. 2 shows another coating apparatus with board introduction at one end of the installation and with two coating devices.
DETAILED DESCRIPTION OF THE DRAWINGS
In the embodiment of the coating apparatus shown in FIG. 1, a circuit board 1 is moved from a board insertion point 1' to a conveyor 2 and placed onto a movable conveyor device or transport slide 3. The transport slide 3 comprises a turning device and a lateral board holder. With this, it travels through the pouring film of a coating device 4, whereby one side of the circuit board 1 is provided with a coating.
The transport slide 3 with the circuit board 1 on one side is halted on the conveyor and turned around in the device 5. The uncoated side of the circuit board is now on top. In
REFERENCES:
patent: 3610397 (1971-10-01), Bok
patent: 3777703 (1973-12-01), Gillie
patent: 4111155 (1978-09-01), Klein et al.
patent: 4228582 (1980-10-01), Arai
Gebruder Weber GmbH, Price List, p. 24.
Koch Robert J.
Pianalto Bernard
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