METHOD, APPARATUS AND USE OF APPLYING VISCOUS MEDIUM ON A SUBSTRATE

Abstract: The invention relates to the screen printing of viscous medium onto a substrate and the subsequent application of additional viscous medium through jetting.

Description: Method, apparatus and use of applying viscous medium on a substrate. Technical field of the invention The present invention generally relates to the field of providing substrates with viscous medium. More specifically, the invention relates to a method of applying a viscous medium on a substrate, said method comprising the step of screen printing predetermined amounts of the viscous medium on predetermined positions on the substrate; an apparatus for application of a viscous medium onto a substrate, said apparatus comprising screen print- ing means for screen printing predetermined amounts of the viscous medium on predetermined positions on the substrate; and an apparatus for application of additional viscous medium onto a screen printed substrate. Background of the invention The most common method of applying viscous medium, such as solder paste, to a substrate, such as a PCB, in electronics production is by using screen printing. The vast majority of viscous medium deposits can be applied by this method. However, in specific circumstances there is a need for different viscous mediums at different locations on the substrate. This poses a problem, since there are a number of difficulties to overcome when adding viscous medium by performing an extra screen printing procedure, after an initial application of viscous medium. Further, it is sometimes desired to produce patterns of viscous medium that are very difficult to achieve through screen printing, such as the pattern of an unfilled circle. It can also be desired that the applied viscous medium presents different heights at different positions on the substrate in order to accommodate, e.g., chip components having different heights, components having different lead angle accuracy, or co-planarity requirements. A solution to the latter problem that has been suggested in u> M tvJ H> o ( Jl O σi O <_π QJ co rt rt O O tr U P. 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TJ Hi J PJ φ ø 00 PJ Φ O tr ID PJ μ- O rt rt tr Ω ø rt Pi TJ Φ 3 μ- 0 00 φ J o rt PJ Hi o ^ μ- Hi rt ø Hi PJ tr rt μ- O Hj 00 O μ- i φ Pi P. J 0 Hi 00 Φ J 0 rt 00 Φ μ- IP Φ Pi ø ^ μ- ø φ 1 μ- Φ TJ 3 rt 1 J μ- J TJ rt 0 tr 3 μ- P. ø tp H φ 3 tr φ 1 μ- J 1 φ rt TJ O CO Φ O 00 IP Hi 0 φ Φ ø rt tr ^ 1 ø rt Hi 1 1 3 Φ > J O ω ω to to μ> I- 1 in o in O in o in deemed worthwhile, the substrate is preferably cleaned from any applied viscous medium and reused. On the other hand, if cleaning the substrate is not considered economical, the substrate is preferably discarded. It should be noted that the screen printing and the subsequent jetting of viscous medium is for the purposes of this application not limited to the use of one viscous medium for both the screen printing and the jetting. Consequently, a number of different types and sorts of vis- cous medium can be used. For instance, the screen printing is performed for a viscous medium, then add-on jetting of another viscous medium is performed. Additionally, the subsequent jetting, the add-on jetting and/or the correction jetting, can be performed in sequences with different sorts of viscous medium. Then, more than one jetting means is preferably used to avoid unwanted mixing of the different viscous medium and/or to avoid increased cycle time due to change of the viscous medium supply and possible cleaning of the jetting means. The above mentioned and other aspects, advantages, and features of the invention will be more fully understood from the following description of exemplifying embodiments thereof. Brief description of the drawings Exemplifying embodiments of the invention will be described below with reference to the accompanying drawings, in which: Figs 1-3 are block diagrams illustrating arrange- ments according to alternative embodiments of the present invention. Figs 4-6 illustrate in flow chart form the alternative embodiments shown in Figs 1-3. Detailed description of preferred embodiments In the block diagrams of Figs 1-3, the thick-lined arrows depict the movement of a substrate 1 through the production line. The dashed boxes simply indicate that the means or apparatus depicted within the box can be incorporated in a single machine. With reference to Figs 1-6, there are illustrated exemplary embodiments of the present invention. As to the specific means used for screen printing, jetting, inspection of application results, removing solder paste, and component mounting, use can be made of suitable means which by themselves are known within the art, and the constructional features of which are also known. Therefore, detailed constructional and functional description of each separate means have been omitted. Furthermore, the viscous medium of the description of exemplary embodiments below is solder paste. However, the invention is not restricted to using solder paste. On the contrary, any type of viscous medium can be used. Turning first to Figs 1 and 4, there is shown a first exemplary embodiment of the present invention. A substrate 1 is at step 100 transferred to a screen printer 12 where an initial application of solder paste is performed, at step 102. Then, the substrate 1 is transferred at step 104 to a machine 16 for performing add-on jetting of additional amounts of solder paste, at step 106. The amounts, patterns, heights, type of solder paste, etc., that is added onto the substrate 1 is predetermined. Thus, there is no inspection if the screen printing results performed prior to the jetting of additional solder paste. Following the add-on jetting step, the substrate 1 is at step 108 transferred to a component mounting machine 18, where electrical components are mounted on the substrate 1. As an alternative, there may be included a step of inspecting the final results of the combined solder paste application, i.e. both the screen printing and the add-on jetting. With reference now to Figs 2 and 5, there is shown another exemplary embodiment of the present invention. This embodiment also includes inspection means 14 pro- vided for inspection of the screen printing results. Following screen printing at step 202, the substrate is at step 204 transferred to inspection means 14 that performs the inspection at step 206. The results of the inspection is recorded and relayed to the means 16' for performing the add-on jetting. With the information as to the results of said inspection, the jetting means 16' can also perform any required jetting of additional solder paste onto positions on the substrate where insufficient amounts have been applied due to some error in the initial screen printing. Thus, the jetting means 16' is a combined add-on jetting and correction means 16' . Further, according to this embodiment, the add-on jetting and correction means 16' can also comprise means for re- moving amounts of solder paste from the substrate. According to this embodiment, the removal is performed through suction of the solder paste at the selected position of the substrate. If the inspection reveals that correction of the substrate 1 is not worthwhile, the sub- strate 1 is passed by the add-on jetting and correction means 16' without any measures taking place. Then, the substrate 1 is simply taken out of the production line before reaching the component mounting machine 18. The inspection means 14 is preferably incorporated in the same machine as the add-on jetting and correction means 16', thus forming a combined inspection and correction machine 15. Then, the inspection means 14 could be used to inspect the result of the add-on jetting to further minimise the application errors on the substrate. However, the inspection means 14 can naturally also be a separate machine . Following the correction and add-on jetting, at step 208, the substrate is transferred to the component mounting machine 18, at step 210. Finally, the block diagram of Fig. 3 and the flow chart of Fig. 6 illustrate yet another exemplary embodiment of the present invention. Here, the screen printer 1 Φ 4H 1 4-4 1 Λ J 0 1 «. o 1 -. 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Claims: CLAIMS 1. A method of applying viscous medium on a sub- strate, comprising the steps of screen printing predetermined amounts of a viscous medium on predetermined positions on the substrate, and add-on jetting of predetermined additional amounts of viscous medium on predetermined positions on the screen printed substrate. 2. The method according to claim 1, comprising the steps of inspecting the results of said screen printing and add-on jetting, determining errors of said screen printing and addon jetting based on said inspection, determining whether correction is required, and correcting, if correction is required, at least some of said errors, wherein said correction comprises supplemental jetting of additional viscous medium onto the screen printed substrate. 3. The method according to claim 1, comprising the steps of inspecting the results of said screen printing prior to said add-on jetting, determining errors of said screen printing based on said inspection, and determining whether correction is required, and correcting, if correction is required, at least some of said errors, wherein said correcting comprises supplemental jetting of additional viscous medium onto the screen printed substrate. 4. The method according to claim 3, wherein said supplemental jetting is performed in connection with performing said add-on jetting. 5. The method according to any one of claims 2-4, wherein said add-on jetting and said supplemental jetting is performed by the same jetting means. 6. The method according to any one of claims 2-5, wherein said step of correcting comprises the step of, removing amounts of viscous medium from positions on the substrate. 7. The method according to any one of claims 2-6, wherein said step of determining whether correction is required comprises the step of evaluating all of the determined errors and deciding on whether the determined errors shall be corrected. 8. The method according to any one of the preceding claims, wherein at least one viscous medium applied through said add-on jetting is different from the viscous medium applied through screen printing. 9. An apparatus for application of viscous medium onto a substrate, comprising screen printing means for screen printing predetermined amounts of a viscous medium on predetermined positions on the substrate, and jetting means for jetting predetermined additional amounts of viscous medium on predetermined positions on the screen printed substrate. 10. The apparatus according to claim 9, comprising inspection means for inspecting the results of said screen printing and jetting, processing means for determining errors of said screen printing and jetting based on said inspection, and correction means for correcting at least some of said errors, wherein said correction means comprises jet- ting means arranged for supplemental jetting of amounts of viscous medium onto the screen printed substrate. 11. The apparatus according to claim 9, comprising inspection means for inspecting the results of said screen printing, processing means for determining errors of said screen printing based on said inspection, and correction means for correcting at least some of said errors, wherein said correction means comprises jet- ting means arranged for supplemental jetting of amounts of viscous medium onto the screen printed substrate. 12. The apparatus according to claim 10 or 11, wherein the correction means comprises removing means for removing viscous medium from the screen printed substrate . 13. The apparatus according to any one of claims 10- 12, wherein the jetting means for jetting additional amounts of viscous medium on predetermined positions on the substrate and the supplemental jetting means is the same jetting means. 14. An apparatus for application of additional vis- cous medium onto a screen printed substrate, comprising jetting means for jetting said additional amounts of viscous medium on predetermined positions on the substrate. 15. The apparatus according to claim 14, comprising inspection means for inspecting the results of said screen printing and jetting, processing means for determining errors of said screen printing and jetting based on said inspection, and correction means for correcting at least some of said errors, wherein said correction means comprises jet- ting means arranged for supplemental jetting of amounts of viscous medium onto the screen printed substrate. 16. The apparatus according to claim 14, comprising inspection means for inspecting the results of said screen printing, processing means for determining errors of said screen printing based on said inspection, and correction means for correcting at least some of said errors, wherein said correction means comprises jet- ting means arranged for supplemental jetting of amounts of viscous medium onto the screen printed substrate. 17. The apparatus according to claim 15 or 16, wherein the correction means comprises removing means for removing viscous medium from the screen printed substrate . 18. The apparatus according to any one of claims 15- 17, wherein the jetting means for jetting additional amounts of viscous medium on predetermined positions on the substrate and the supplemental jetting means is the same jetting means. 19. Use of screen printing and subsequent jetting for applying a viscous medium on a substrate. 20. Use of viscous medium jetting for applying additional viscous medium on a screen printed substrate.

Inventors: HOLM WILLIAM, JACOBSSON NILS, HOLM, WILLIAM, JACOBSSON, NILS
Applicants: HOLM WILLIAM, JACOBSSON NILS, MYDATA AUTOMATION AB, HOLM, WILLIAM, JACOBSSON, NILS
Application year: 2001
Main classification: H05K3
IPC codes: B05C9, B05C11, B05D1, B05D3, B05D5, B23K3, H05K1, H05K3