TWI464067B - Metal printing stencil for forming different coating thicknesses in single time printing - Google Patents

Description

Metal printing template with different film thicknesses in one printing

The present invention relates to a printing jig for forming a precision coating, and more particularly to a metal printing template which is formed by one printing to form different film thicknesses.

In the traditional electronic component process, screen printing and stencil printing are lower cost pattern forming techniques, especially for solar cells, laminated ceramic capacitors, other laminated or thin film types. Mass production of products. However, the screen printing used in the screen printing has the result that the network line and the network line are interlaced, and the pattern reproducibility, precision and resolution of the printing cannot be further improved. Therefore, the applicant discloses a domestic patent I299304 "metal printing template and its use method", national patent I306061 "multi-layer metal printing template and its manufacturing method", and national patent M388414 "metal printing template", providing a variety of high precision stencil printing The fixture is mainly made of precision electroformed single or multi-layer metal film, which is to improve the shortcomings of traditional screen printing.

In addition, in certain electronic products, there is a need for different thicknesses of the printed pattern coating. According to the current screen printing technology, it is necessary to design two sets of different patterns of the screen and perform two (multi) printing operations, the first printing. The screen has a corresponding pattern of a thick film coating layer and a thicker film coating layer, and is subjected to a second printing after drying, and the second printing screen has only a thick film coating layer. The corresponding pattern needs to be dried again after the second printing, which not only has poor process efficiency, but also the alignment error of the two printings causes the thickness of the thick film coating layer to be insufficient and the wire diameter to be widened. Therefore, in the high precision stencil printing process of patterning, the client desires to have the need to form a printed coating of different thicknesses in one print.

In view of the above, the main object of the present invention is to provide a metal printing template for forming different film thicknesses in one printing, which can achieve the effect of forming two (multiple) patterned coatings of different film thicknesses in one printing.

A second object of the present invention is to provide a metal printing template having different film thicknesses in one printing, which is susceptible to cracking and deformation in a thick film thickness coating region in a metal film.

A further object of the present invention is to provide a metal printing template for forming different film thicknesses in one printing, so as to improve the printing material to be easily deposited in a special structure for forming coating regions of different film thicknesses, such as array micropores and connecting bridges. Filling gaps...etc.

The object of the present invention and solving the technical problems thereof are achieved by the following technical solutions. The invention discloses a metal printing template which is formed by one printing to form different film thicknesses, and mainly comprises a metal film sheet having a bonding surface and a printing surface, and defining one of different printing film thicknesses, a first film thickness coating area and a second film thickness coating zone, wherein the first film thickness coating zone is an equal-area opening through the bonding surface and the printing surface, and the second film thickness coating zone comprises a plurality of Array micropores, the open porosity of the array micropores is 40% to 90% of the area ratio of the second film thickness coating zone.

The object of the present invention and solving the technical problems thereof can be further achieved by the following technical measures.

In the foregoing metal printing template, the width of the solid strip of the metal film between the array micropores may be no more than one-half of the pitch of the center point to the center point between the array micro holes.

In the aforementioned metal printing template, the area opening may be a long slot.

In the foregoing metal printing template, a plurality of connecting bridges may be further included, which are integrally connected to the two symmetric long sides of the area openings of the metal diaphragm to prevent long grooves when the metal diaphragm is stretched. The joints of the holes are not protruded from the printing surface, and the thickness of the connecting bridges may be smaller than the thickness of the metal film from the attaching surface to the printing surface, so that each connecting bridge is A filler notch is formed in the portion facing the attachment surface.

In the foregoing metal printing stencil, the area opening may have a connecting end extending into the second film thickness coating zone.

In the aforementioned metal printing template, the connecting end of the area opening may be located between the two array micro holes of the nearest row.

In the aforementioned metal printing stencil, the equal area openings may extend through the second film thickness coating zone.

In the foregoing metal printing template, the metal diaphragm may be an electroformed steel plate having a thickness of 15 to 300 micrometers.

In the foregoing metal printing template, the method further includes: a first lubricating film layer formed on the printing surface; a second lubricating film layer formed in the hole wall of the area opening; and a first A three-lubricating film layer is formed in the pore walls of the array of micropores.

In the above metal printing template, the area opening may be a long slot having two symmetric long sides, and the metal printing template may further comprise: a plurality of connecting bridges integrally connected to the metal diaphragm The two symmetric long sides of the area openings; and a fourth lubricating film layer are formed on the side surfaces and the bottom surfaces of the connecting bridges exposed in the openings of the areas.

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings in which FIG. The components and combinations related to this case, the components shown in the figure are not drawn in proportion to the actual number, shape and size of the actual implementation. Some size ratios are proportional to other related sizes or have been exaggerated or simplified to provide clearer description of. The actual number, shape and size ratio of the implementation is an optional design, and the detailed component layout may be more complicated.

According to a first embodiment of the present invention, a metal printing template for forming different film thicknesses in one printing is illustrated in a schematic plan view of FIG. 1, a partial plan view of FIG. 2, and a plan view of a film thickness of two layers in a film thickness of FIG. The schematic view of the plane enlarged, the perspective view of Fig. 4 in Fig. 3, and the cutaway view of Fig. 5 along line 5-5 of Fig. 4. The invention discloses a metal printing template 100 which is formed by one printing to form different film thicknesses, and mainly comprises a metal film 110 having a bonding surface 111 and a printing surface 112 and defining different printing film thicknesses. A first film thickness coating zone 113 and a second film thickness coating zone 114. Generally, the metal film 110 is stretched and attached to a frame template 130. The printing surface 112 of the metal film 110 is exposed in one of the openings 131 of the frame template 130. The attachment surface 111 is attached to a to-be-printed object 310 (as shown in FIG. 6A), and the to-be-printed object 310 can be a master of an electronic component, such as a solar cell substrate or a light-emitting diode wafer. , integrated circuit wafers, passive component ceramic masters, or packaged substrate masters...etc. The printing surface 112 is a scratching surface of the doctor blade 320, that is, a surface that can be filled with the coating material 330 (as shown in FIG. 6A), and the coating material 330 can be a conductive paste such as a silver paste or a copper paste or the like. In this embodiment, the metal diaphragm 110 can be an electroformed steel plate having a first thickness T1 of 15 to 300 micrometers, that is, the metal diaphragm 110 is a precision layer without a mesh layer. The cast film structure can be a single layer structure. The material of the metal diaphragm 110 is nickel or nickel-cobalt (Ni-Co) alloy, which is relatively hard and smooth, can reduce the adhesion of the ink during printing, and contributes to the workability of the steel plate printing.

The first film thickness coating area 113 is an area opening through the bonding surface 111 and the printing surface 112. In other words, the area size of the first film thickness coating area 113 is such that the area is opened. As defined, the walls of the apertures of the area are the edges of the first film thickness coating zone 113. In this embodiment, the equal-area opening system may be a long slotted hole and has two symmetric long sides, generally an equal-area opening in the form of a long slotted hole (ie, the first film thickness coating area 113) It may have a narrow width, that is, a gap distance between the two symmetric long sides, which may be about 1 to 10000 micrometers (may be less than 1 cm), and more specifically between 10 and 100 micrometers. As shown in FIGS. 3 and 4, the width of the area opening (ie, the first film thickness coating area 113) is smaller than the pitch P of the plurality of array micro holes 115 in the second film thickness coating area 114. And approaching the parallel edges or apertures of the array of micropores 115, for example, when the area openings (ie, the first film thickness coating area 113) provide line formation as a solar cell, the area openings ( That is, the width of the first film thickness coating region 113) may specifically be 50 to 70 micrometers. In addition, the lengths of the two symmetric long sides of the area opening (ie, the first film thickness coating area 113) are several centimeters to several tens of centimeters, and may be extended or connected according to the needs of the product. As shown in Fig. 2, a plurality of equal-area openings (i.e., the first film-thick coating area 113) can be joined into comb-like slots.

The plurality of array micropores 115 are included in the second film thickness coating region 114. The aperture ratio of the array micropores 115 is 40% to 90% of the area ratio of the second film thickness coating region 114. The so-called open cell ratio is obtained by dividing the total cooperation of all the hole areas of the array micropores 115 into a sub-number and the area of the second film thickness coating area 114 as a parent number, and dividing the number of sub-divisions by the number of the mothers. percentage. The area size of the second film thickness coating region 114 is defined by the peripheral edges of the outermost rows and columns of the array micropores 115. The opening ratio of the array of micropores 115 should be limited to a specific range corresponding to the viscosity of the coating. When the aperture ratio of the array of micropores 115 is too high (such as a fine mesh structure) or the pore depth is insufficient, The predetermined thinned coating layer is reached, and when the metal film sheet 110 or the doctor blade is stretched, the array micropores 115 will be easily broken; otherwise, when the array micropores 115 have an opening ratio When the temperature is too low, it indicates that the width of the solid strips between the array micropores 115 is too large, and the paints derived from the array micropores 115 will not be easily connected to form a coating. More specifically, the aperture ratio of the array of micropores 115 is 50% to 80% of the area ratio of the second film thickness coating region 114. In addition, the array microholes 115 have a fixed pitch P from one of the center point to the center point. Generally, the pitch P of the array micro-holes 115 may be no more than 100 micrometers (μm), and the apertures or long sides of the array micro-holes 115 may be not less than one-half of the pitch P of the array micro-holes 115. For example, it is about 50 microns to achieve a dense arrangement. In this embodiment, the array microholes 115 are square holes. More specifically, referring to FIGS. 4 and 5, the strip width W1 of the metal film 110 between the array micropores 115 may not be greater than the pitch from the center point to the center point between the array micro holes 115. One-half of P can ensure that the metal film 110 can be loosely connected to a thin coating on the object to be printed after the printing is released due to the detachment of the object to be printed. In addition, the hole depth of the array of micropores 115 may correspond to the first thickness T1 of the metal film 110 from the attaching surface 111 to the printing surface 112. The length of the long side of the area opening (ie, the first film thickness coating area 113) is also several ten times or more, or even thousands of times, the aperture or the long side of the array micro holes 115. In this embodiment, the plurality of array micropores 115 are included to provide the formation of a bus as a solar cell.

As shown in FIG. 6A, when the metal printing template 100 is used for stencil printing, the attaching surface 111 of the metal film 110 is attached to the object to be printed 310, and the metal film 110 is used by the doctor blade 320. The printing surface 112 is scraped to fill the coating material 330 into the array openings (ie, the first film thickness coating region 113) and the array pores 115 in the second film thickness coating region 114. . As shown in FIG. 6B, after the metal printing template 100 is detached, the coating material 330 is formed on the to-be-printed object 310 as a first film thickness coating layer 331 in the array opening micro-holes. 115 inner coating material 330 is connected to each other on the object to be printed 310 to form a second film thickness coating layer 332, and is connected to the first film thickness coating layer 331, wherein the second film thickness coating layer The thickness of 332 can be significantly less than the thickness of the first film thickness coating layer 331, for example, less than two-thirds of the thickness of the first film thickness coating layer 331. In this embodiment, the thickness of the first film thickness coating layer 331 may be about 31 to 50 micrometers, and the thickness of the second film thickness coating layer 332 may be about 10 to 30 micrometers. Therefore, with the metal printing template 100 of the present invention, the coating layers 331 and 332 of different film thickness can be formed in one printing, which can save the processing time and cost of the conventional printing, and there is no conventional coating in multiple printing. Uncertain displacement deviation of the layer.

Preferably, the metal printing template 100 further includes a plurality of connecting bridges 120 integrally connected to the two symmetric long sides of the area openings of the metal diaphragm 110 to prevent the metal film from being stretched. The sheet 110 causes cracking of the long slot, that is, the problem that the first film thickness coating region 113 for forming a thick film thickness in the metal film 110 is easily cracked and deformed. Moreover, the connecting bridges 120 are preferably not protruded from the printing surface 112 so as not to affect the operation of the blade. Preferably, the connecting bridges 120 are coplanarly aligned with the printing surface 112, which makes it easier to manufacture the connecting bridges 120 during printing operations, and prevents paint from sticking during printing operations. Above the connecting bridges 120. And a filler notch 121 is formed in a portion of the connecting bridge 120 facing the attaching surface 111, that is, a second thickness T2 of the connecting bridges 120 is smaller than the metal diaphragm 110 from the attaching surface 111 to the The first thickness T1 of the printing surface 112 is viewed from the direction of the attachment surface 111 by the first film thickness coating area 113 (ie, the area opening), which has a communicating hole edge to ensure the paint is to be printed. The upper line pattern is continuously formed, and the first film thickness coating area 113 (i.e., the equal area opening) is viewed from the printing surface 112, which may be in the form of an intermittent long slot. Specifically, the joint bridges 120 can be fabricated in the electroforming process as the metal diaphragm 110. Specifically, the materials of the connecting bridges 120 may be selected from one of nickel, nickel alloy, copper, and copper alloys, and the metal diaphragms 110 may be the same or different materials due to the links. The flyover 120 can also be fabricated by an electroforming process, so that a single or composite metal structure can be easily fabricated in the openings of the areas. In addition, the connecting bridges 120 have a width in the same direction as the two symmetric long sides of the equal-area openings, which may be no more than a gap between the two symmetric long sides of the corresponding first film thickness coating region 113 (ie, The width of the opening of the area of the long slot is reduced to reduce the maximum area of the unit corresponding to the first film thickness coating area 113 being shielded by the connecting bridges 120, which facilitates rapid filling and filling of the corresponding filling gap. 121. More specifically, the second thickness T2 of the connecting bridges 120 may be between one sixth and two thirds of the first thickness T1 of the metal diaphragm 110, and the filling gap 121 may be relatively defined. depth. In this embodiment, the thickness of the metal diaphragm 110 is about 50 micrometers, and the thickness of the connecting bridges 120 can be between 20 and 25 micrometers or less. In addition, preferably, the connecting bridges 120 may be equally spaced in each of the first film thickness coating regions 113 to uniformly withstand stress. Therefore, the underside of the connecting bridge 120 allows the paint to pass through to the horizontal plane of the attaching surface 111, and can strengthen and support the long slot structure of the opening of the area, thereby preventing the first in the stencil printing. The two symmetric long sides of the film thickness coating zone 113 produce a gap change or a long slot hole crack.

Preferably, the area openings (ie, the first film thickness coating zone 113) may have a connection end 116 extending into the second film thickness coating zone 114. In a more specific configuration of the present invention, the connection end 116 of the area opening may be located between the two array micro holes 115A of the nearest row such that the distance from the connection end 116 to the nearest array aperture 115B is W2. It is not greater than the width W1 of the solid strip of the metal film 110 between the array of micropores 115. Therefore, as shown in FIG. 6B, the structure ensures the mutual diffusion connection between the first film thickness coating layer 331 and the second film thickness coating layer 332. After the heat sintering, the first film thickness is The coating layer 331 can be a thick and thin conductive line, and the second film thickness coating layer 332 can be a thin and wide electrical conductive bus, and the two are electrically connected to each other. Sexual connection.

As shown in FIG. 5, in a preferred embodiment, the metal printing template 100 can further include a first lubricating film layer 141 formed on the printing surface 112, and a hole formed in the area. A second lubricating film layer 142 of the hole wall and a third lubricating film layer 143 formed in the hole walls of the array micropores 115. The lubricating film layers 141, 142, and 143 may be the same organic or inorganic lubricating materials (for example, Teflon, Molybdenum Oxide, Alumina, Talc, etc.) having non-stick properties to the coating material and treated with appropriate surface treatment. The method is formed such that the thickness thereof is controlled to be between 0.1 and 20 micrometers, and more specifically, it can be controlled to be between 0.5 and 5 micrometers, thereby providing the non-stick coating in the holes of the area and the micropores 115 of the array to facilitate the removal of the coating. In the mold, most of the paint can be printed on the object to be printed 310 and the print surface 112 is scratched. Therefore, the first film thickness coating layer 331 and the second film thickness coating layer 332 can be further controlled. The predetermined film thickness is poor. The specific formation method of the lubricating film layers 141, 142, and 143 may be formed by using a composite plating (or may be a plating) to form the lubricating film layers 141, 142, and 143, that is, adding organic substances to the plating solution. Or inorganic particles are attached to the holes of the area and the array of micropores 115. Alternatively, the lubricating film layers 141, 142, and 143 may be metal-lubricated materials having non-stick properties to the paint, and may be formed by plating on the surface of the metal film 110 and the walls of the holes. For example, in another specific forming method of the lubricating film layers 141, 142, and 143, when the materials of the lubricating film layers 141, 142, and 143 are metal oxides, the corresponding metals may be plated first and then oxidized. It can be treated, for example, anodized aluminum or aluminum alloy.

In particular, as shown in FIG. 5, when the area opening (ie, the first film thickness coating area 113) is a long slot and has two symmetric short sides and two symmetric long sides, In addition to preferably including a plurality of connecting bridges 120, the metal printing template 100 may further include a fourth lubricating film layer 144 formed on the side and bottom surfaces of the connecting bridges 120 exposed in the openings of the areas. As shown in FIG. 6A, the use of the fourth lubricating film layer 144 will facilitate the flow of the coating 330 to fill the filler gaps 121 below the connecting bridges 120. Therefore, the metal printing template of the present invention can improve the printing material to easily accumulate in a special structure for forming coating regions of different film thicknesses, such as the array micropores or the filler gaps of the connecting bridges, and the like.

According to a second embodiment of the present invention, another metal printing template having different film thicknesses is formed by one printing, and a partial plan view of FIG. 7 and a plan enlarged view of the film thickness of the two film thicknesses of FIG. 8 are illustrated. And a perspective view of Fig. 9 in Fig. 8. Wherein, the same reference numerals will be used for the same elements as the first embodiment. The metal print template 200 mainly includes a metal film 110. As in the first embodiment, a metal film 110 is mainly included. The metal film 110 has a bonding surface 111 and a printing surface 112, and defines one of different printing film thicknesses. The first film thickness coating area 113 And a second film thickness coating area 114, wherein the first film thickness coating area 113 is an area opening through the bonding surface 111 and the printing surface 112, and the second film thickness coating area 114 The inner system includes a plurality of array micropores 115, and the aperture ratio of the array micropores 115 is 40% to 90% of the area ratio of the second film thickness coating region 114. In this embodiment, the area opening (ie, the first film thickness coating area 113) may penetrate the second film thickness coating area 114 to ensure formation by the first film thickness coating area 113. The thicker first film thickness coating layer is attached to the thinner second film thickness coating layer formed by the second film thickness coating zone 114.

The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the present invention. Any simple modifications, equivalent changes and modifications made without departing from the technical scope of the present invention are still within the technical scope of the present invention.

5‧‧‧ Cut line markings shown in Figure 5

100‧‧‧metal printing template

110‧‧‧Metal diaphragm

111‧‧‧ Attachment

112‧‧‧Printed surface

113‧‧‧First film thickness coating area

114‧‧‧Second film thickness coating area

115‧‧‧Array micropores

115A‧‧‧Two array micropores in the nearest row

115B‧‧‧ Nearest Array Microwell

116‧‧‧Connected end

120‧‧‧Linked Flyover

121‧‧‧ Filling gap

130‧‧‧Frame template

131‧‧‧ openings

141‧‧‧First lubricating film layer

142‧‧‧Second lubricating film layer

143‧‧‧ Third lubricating film layer

144‧‧‧fourth lubricating film layer

200‧‧‧metal printing template

310‧‧‧To be printed

320‧‧‧ scraper

330‧‧‧ paint

331‧‧‧First film thickness coating

332‧‧‧Second film coating layer

P‧‧‧pitch from center point to center point between array microwells

W1‧‧‧ Width of the solid strip between the array microwells

Distance from the W2‧‧‧ connection to the nearest array of microvias

T1‧‧‧ from the attachment surface to the first thickness of the printing surface

The second thickness of the T2‧‧‧ link flyover

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a plan view showing a metal printing template having different film thicknesses in one printing according to a first embodiment of the present invention.

Figure 2 is a partial plan view of the metal printing template in accordance with a first embodiment of the present invention.

Figure 3 is a plan enlarged view of the metal printing template at a two film thickness coating zone in accordance with a first embodiment of the present invention.

Figure 4 is a perspective view of the metal printing template according to a first embodiment of the present invention in Figure 3.

Fig. 5 is a cross-sectional view of the metal printing template according to a first embodiment of the present invention taken along line 5-5 of Fig. 4.

6A and 6B are schematic cross-sectional views showing a patterned coating of two (multiple) different film thicknesses on a substrate after use in accordance with a first embodiment of the present invention.

Figure 7 is a partial plan view showing another metal printing template for forming different film thicknesses in one printing according to a second embodiment of the present invention.

Figure 8 is a plan enlarged view of the metal printing template at two film thickness coating zones in accordance with a second embodiment of the present invention.

Figure 9 is a perspective view of the metal printing template according to a second embodiment of the present invention in Figure 8.

5‧‧‧ Cut line markings shown in Figure 5

110‧‧‧Metal diaphragm

111‧‧‧ Attachment

112‧‧‧Printed surface

113‧‧‧First film thickness coating area

114‧‧‧Second film thickness coating area

115‧‧‧Array micropores

115A‧‧‧Two array micropores in the nearest row

115B‧‧‧ Nearest Array Microwell

116‧‧‧Connected end

120‧‧‧Linked Flyover

121‧‧‧ Filling gap

P‧‧‧pitch from center point to center point between array microwells

W1‧‧‧ Width of the solid strip between the array microwells

Distance from the W2‧‧‧ connection to the nearest array of microvias

T1‧‧‧ from the attachment surface to the first thickness of the printing surface

The second thickness of the T2‧‧‧ link flyover

Claims (10)

A metal printing template for forming different film thicknesses at one time, comprising: a metal film having a bonding surface and a printing surface, and defining one of different printing film thicknesses, a first film thickness coating area and a second a film thickness coating zone, wherein the first film thickness coating zone is an equal-area opening through the bonding surface and the printing surface, and the second film thickness coating zone comprises a plurality of array micropores The open porosity of the array micropores is 40% to 90% of the area ratio of the second film thickness coating region. Forming a metal printing template of different film thickness according to the first printing of the first application of the patent scope, wherein the width of the solid strip of the metal film between the array micropores is not more than the center point to the center between the array micro holes One-half of the pitch of points. The metal printing template of different film thicknesses is formed by one printing according to the first item of the patent application scope, wherein the area opening is a long slot. Forming a metal printing template of different film thicknesses according to the third item of the patent application scope, and further comprising a plurality of connecting bridges integrally connected to the two symmetric long sides of the area openings of the metal film to prevent When the metal diaphragm is stretched, the long slot holes are cracked, and the connecting bridges do not protrude from the printing surface, and each of the connecting bridges forms a filling gap at a portion facing the attaching surface. The metal printing templates of different film thicknesses are formed by printing one time according to the third or fourth aspect of the patent application, wherein the area opening has a connecting end extending into the coating area of the second film thickness. The metal printing template of different film thicknesses is formed by one printing according to item 5 of the patent application scope, wherein the connecting end of the area opening is located between the two array micro holes of the nearest row. The metal printing templates of different film thicknesses are formed by one printing according to the third or fourth aspect of the patent application, wherein the area opening is through the second film thickness coating area. The metal printing template of different film thicknesses is formed by one printing according to the first item of the patent application scope, wherein the metal film is an electroformed steel plate having a first thickness system of 15 to 300 micrometers. Forming a metal printing template having different film thicknesses according to the first printing of the first paragraph of the patent application, further comprising: a first lubricating film layer formed on the printing surface; a second lubricating film layer formed on the area a hole in the wall of the hole; and a third lubricating film layer formed in the hole wall of the array of micropores. Forming a metal printing template of different film thickness according to the printing of item 9 of the patent application scope, the area opening is a long slot and having two symmetric long sides, and the metal printing template further comprises: a plurality of connecting bridges, The two symmetric long sides are integrally connected to the opening of the area of the metal diaphragm; and a fourth lubricating film layer is formed on the side and the bottom surface of the connecting bridge exposed in the opening of the area.