DE2809615A1 - THERMAL PRESSURE DEVICE - Google Patents

Description

2803615

The invention relates to a thermal printing device, in particular but not exclusively, for facsimile printing.

The achievable resolution with thermal printing devices of those Construction comprising a number of individual, discrete heating elements, each of which has an element on it Demand is excited is limited by the attainable minimum distance. Currently achievable resolutions are in the On the order of 0.51 mm (0.02 inches). However, if a high resolution is required, for example in facsimile printing, then resolutions up to 0.13 mm (.005 inches) are desirable. Such a high resolution is then desirable if drawings, illustrations, newspaper notes of small type and other documents are included fine details can be printed out via telecommunication connection systems were transferred. It is also desirable to be able to transfer the full width of a page and print with a reasonable print speed. Because the paper changes color due to heat suffers, there is a need to generate sufficient heat for a sufficient period of time to produce the desired Supply color density of the print.

In DE-OS 2 648 842.6 the use of a continuous Suggested strip of electrical resistance material; there were ladder patterns on each side of the strip, which were connected to the strip and designed in a special arrangement, whereby with selective excitation of the pattern in the strip, heated areas were generated at the desired positions.

Although this known arrangement works effectively and has a high resolution with a satisfactory color density

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supplies, it is necessary here that the Ladders are very narrow and need to be spaced a little apart. For a resolution of eight points per millimeter (200 dots per inch) the center-to-center distance of the contacts is 0.13 mm (.005 ") while the conductor widths are on the order of 0.08 mm (.003 "). This can create manufacturing difficulties to lead. Also, some of the conductors of the line patterns are long and can have a resistance that is lower than that in the overall system is disturbing.

According to the invention there is an arrangement of the conductors in the conductor patterns created that doubles the center-to-center distance while maintaining a special resolution. For example, although a resolution of eight dots per millimeter (200 dots to the inch) is achieved, which corresponds to a center-center distance of the points of 0.13 mm (.005 ") can be made by those running to the strip Conductor a center-to-center distance of 0.25 mm (.010 "). This is achieved by staggering the conductors on one side of the strip opposite the Reached ladders on the other side of the strip. By selectively activating a first conductor on one side can be made to connect to one or the other of the two conductors on the other side of the strip with the two conductors positioned on either side of the centerline of the first conductor.

The invention is described below, for example, with reference to the drawing; in this shows:

Figures 1 and 2 are schematic, perspective views of a

typical section through a device known from DE-OS 2 64-8 842.6,

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FIG. 3 shows a schematic plan view of a conductor / strip arrangement according to the invention;

Figure 4 is a schematic plan view of the conductor pattern on each side of the strip;

Figure 5 is a sectional view taken along line V-V of Figure 4;

Figure 6 is a top plan view of a portion of the conductor patterns and resistive strip for a facsimile printer;

Figure 7 is a schematic top plan view of one embodiment of the connector and conductor patterns for the assembly according to Fig. 6;

FIG. 8 shows a section along the line VIII-VIII according to FIG. 75 and

FIG. 9 shows a section along the line IX-IX according to FIG.

1 and 2 show the principle of the known device, the schematic view in Fig. 1 gives the printing strip or web 10 as a continuous strip of electrical resistance material on a substrate 11 again} furthermore two conductor patterns 12a and 12b on one side of the strip 10 and four conductor patterns 13a » 13b, 13c and 13 <i on the other side of the strip 10 shown. Each of the two conductor patterns 12a and 12b is associated with the strip 10 at a plurality of spaced apart Make 14a - 14d or 15a - 15d in contact. The ladder pattern 13a, 13b, 13c and 13d are connected to the strip 10 at corresponding, positions 16a, 16b, 17a, 17b, 18a, 18b, offset from one another and spaced from one another and 19a, 19b in contact. By suitably combining a particular pattern 12a or 12b and a particular pattern

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15a, 13b, 15c or 13d to a power supply can be in the strip 10 a heat point can be formed at one of the opposite contact points. It should be noted that for each contact there must be a contact on one side of the strip on the other side of the strip. With the desired Center-to-center distances of 0.13 mm (.005 ") for With a resolution of eight lines per millimeter (200 lines per inch), the conductor patterns are quite narrow and tight packed.

Fig. 2 is a typical cross-section through the conductor pattern for an arrangement according to Fig. 1. The strip 10 is for example of the type of thick film deposited over the opposite ends of the conductors 20, which are of thin film type. An insulating layer 21 is formed over the conductors 20, wherein on both sides of the Strip 10 recesses 22 are left behind. In desirable positions are passages or interconnecting holes 23 formed; Conductor patterns 25 and 26 are applied over the insulating layer, which individual Conductor 25a (that of conductor 12a in Fig. 1, for example corresponds to) and 26a and 26b (which correspond to conductors 13d and 13c of Fig. 1). The conductors 25a, 26a and 26b are in contact with their respective conductors 20 through vias 23 and may be in the form of a thin film or a printed thick film.

As already mentioned, the subject matter of the invention is capable of the center / center distance of the conductor connections to double the strip, whereby the width of the conductor can be increased significantly, while still the the same resolution as in the arrangement according to FIG. 1 is present. This is done by staggering a group of Connections to the strip achieved across the other group of connections. This is shown schematically in Fig. 3

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given. For the sake of clarity, all components here have different reference numerals compared to FIGS. 1 and 2, the resistance strip being denoted by the symbol 10 and the holder or the substrate with the mark 11 excepted are.

In Fig. 3 it can be seen that the conductor 30 on one side of the strip 10 and the conductors 31 to the other side of the Strip are connected. The ladder 31 are opposite the ladders 30 offset with the center lines of the ladder

31 run midway between the center lines of the ladder 30. Depending on the power connections A conductor 31 can work with one or the other of the two Conductor 30 are connected. Thus, if a conductor 30a, as can be seen in Fig. 3, is connected to a power supply and the conductor 31a is also connected, a hot spot is then formed at location 32a, while when the conductors 30a and 31b are connected to a power source a hot spot is created at location 32b. The area of the hot spots is indicated generally by the reference number

32 provided.

Fig. 4- gives in conjunction with Fig. 5 in more detail an embodiment of a conductor arrangement again. On one side of the strip 10 on a substrate 11 is a plurality formed by transverse conductors 35 which extend parallel to the strip. A structural limitation of the The width and spacing of the conductors 35 does not exist, with the exception of the final size of the finished device, which, in the direction perpendicular to the axis of the strip 10, depends on the width and the distance, the length of the Connections from the conductors to the strip is influenced, which will be explained in connection with FIG. However, if one is aware of these details, it is possible to set the widths and spacing of the conductors 35 in such a way

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to choose that manufacturing problems are minimal and in the Manufacturing a high level of quality is achieved. This is important because after the conductors 35 are formed by a thick film process, the conductors 35 are covered by an insulating glaze layer 36, for example by a Frittelos gold process will. Subsequent repair is at least extremely difficult. There can be other methods of training the conductor 35 can be used, including, for example, the etching of thick or thin film materials. Apart from that Various metal deposition of gold, such as a palladium-silver thick film, are useful.

At the same time that the conductors 35 are formed on one side of the strip 10, a A plurality of primary connection parts 37 is formed which extend perpendicular to the strip 10 and just before the first Ladder 35 ends. These primary connection parts 37 can in this one process step made of the same material as the Conductors 35 are formed. The other side of the strip 10 will be at the same time and suitably from the same Material forming the conductor and connection pattern. These patterns are of two types. Thus, a plurality of connection elements 38, which extend perpendicular to the axis of the strip 10 and in the middle position between the connection parts 37 are arranged. Alternating connection elements 38 are formed together with conductors 39, terminal members 38, conductors 39 and pads 40 being formed at the same time. Via the ladder 39 and An insulating glaze layer 41 is applied over a portion of each connector 38. The layer 41 is usually applied at the same time as layer 36 over conductors 35

In fact, the strip 10 is not formed until at least the terminal portions 37 and 38 have been formed.

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It is usually formed by a thick film process and can consist of more than one layer.

Vias 42 are formed in layer 36 in a predetermined pattern. The passages 42 can be lasered or by a suitable screen printing technique in the thick film process for applying the glaze layer. Secondary connectors 43 are then applied to the glaze layer 36. At one closest to strip 10 Each secondary terminal overlaps the end of a primary terminal part 37 and is electrically connected to it. At its other end, each secondary connector overlaps a particular conductor 35 and is passed through the corresponding ones Passages 42 electrically connected to it. Additional conductors 44 become the same on the other side of the strip 10 Time as the secondary connection parts 43 and also made of the same material. These conductors 44 overlap those alternating Connections 38 that are not uniform with the conductors 39. These alternating connectors 38 are shorter than the other connecting elements 38, as can be seen in Fig. 4, formed and extend only to a short one Piece under the glaze layer 41. The conductors 44 have connection surfaces 45.

Terminal surfaces are formed at one end of each conductor 35, which cannot be seen in FIG. Appropriately and in order to enable large connection surfaces, these can be formed at alternating ends, as shown in FIG see is. The special relative widths of conductors and connection elements according to FIG. 4 are only used for illustration and can be modified. Thus, for example, some or all of the secondary connector portions 43 may be wider than the primary terminal parts 37 are made. It is also conceivable that the primary and secondary connection parts 37 and 43 are formed once, while the strip 10 after manufacture

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position of the connection elements is designed. This would be especially true when using thin film resistive elements be used.

FIG. 6 shows a section of a device with an arrangement of conductors and connection elements for training purposes a wide, easy-to-make contact area between the conductors and connection elements. A pattern from Conductors 5 ° is formed on a substrate 11, the Conductors 50 are parallel to each other and parallel to the strip 10 extend. These conductors 50 correspond to the conductors according to FIG. 4-. An insulating glaze layer is applied over the conductors 50 applied, the peripheral edge with the interrupted Line 51 is indicated. A trough or channel 52 is formed in the glaze layer and lets in short piece of each conductor 50 are exposed. On the glaze layer a pattern of connection elements 53 is made, which are via short conductive connection elements 53a - which the connection parts 37 according to Fig. 4- correspond - in one Extend end to strip 10. Each connection element runs to a single conductor 50. The shorter connection elements, d. H. the left part of the section in Fig. 6, with the exception of the first connection element, are narrower arranged and follow a curved or kinked path in order to create space for the channel 52. The connections of a longer course are straight and also wider. This creates the possibility of reducing the resistance of the longer connection paths at a desirably low level. The intestine becomes a short transverse extension to each connection element formed, which lies over a corresponding conductor, and in the channel 52 with the conductor an electrical Contact forms. These transverse extensions are provided with the reference number 54-. Even for the first or the furthest A short transverse extension 54- is formed on the connecting element on the left.

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This structure has the advantage that the connecting elements 55, which are arranged at a smaller distance, lie on the upper side of the glaze layer and again quite easily
can be repaired. The connection elements can consist of a thin film structure.

The conductors 50 terminate at alternating ends in pads 56 that are at the same time as the conductors or
are manufactured in a separate manufacturing stage
can. The formation of the pads 56 at alternate ends has the advantage that large areas can be provided. However, the pads 56 can all be at the same end; it is also possible to have two
To provide rows of pads with alternating pads with alternating conductors extending between pads of the innermost row.

On the opposite side of the strip from conductors 50, a second pattern of conductors and connectors is formed on the substrate. From Figure 6 it can be seen that a plurality of connection elements 57 extend from the strip 10, the centers of the connection elements 57 being in the middle between the centers of the connection elements 53. Alternating connection elements 57 extend to a cross line 58 and are connected to the strip 10 by connection elements 57a. The remaining connection elements are then connected to a short
Line 59 connected. This is shown schematically in FIG. 6
represented by line 60.

FIGS. 7, 8 and 9 illustrate a possibility of how the connection elements 57 alternate with transverse conductors 58
and 60 are connected. The strip 10 is applied to the substrate 11. The strip 10 covers the inner ends of the connecting elements 57 »Alternating connecting elements, the

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to cross conductor 58 can run integrally and simultaneously be formed with the cross conductor 58. The other connection elements end shortly before the transverse conductor 58, which is indicated by dashed lines 65. A dielectric Glaze 66 is then applied over the cross conductor 58 and extends to line 67. Cross conductor 60 is formed and, at the same time, conductors, with reference numeral 57a in FIGS. 8 and 9, formed on the connecting elements 57. The thin film gold layer extends in essentially from the strip 10 over the thick film gold connectors 57, over the glaze and into contact with the Conductor 60 as seen in FIG. For the connection elements connected to the conductors 58, the extends Thin film layer 57a essentially lengthways from strip 10 part of each connector 57 and then up and a short distance over glaze 66, as shown in FIG Fig. 8 shows. The conductors 57a can, if desired, be formed separately from the conductor 60.

The glaze layer 66 serves to ensure that the end regions of the connecting elements 57 are lifted off. The thin film gold layers 57a create a connection between the connection elements 57 and the cross conductor 60 and improve the physical Structure of the connection elements 57 Thick film layers as used for the connection elements 57 can often have pores or pinholes, while the thin film closes such pinholes and the conductivity of the Connection elements 57 improved.

The detail shown in Fig. 6 shows forty connection elements 57 and forty connection elements 53. By selectively connecting connection areas 56 and 61, one obtains the Strip 10 for this cutout eighty possible heat points. For a resolution of eight lines per millimeter (200 line per inch) heat points must be at a center distance of

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0.13 can now be formed (.005 "). Due to the structural arrangement shown in FIGS. 3 »4 and 5 and in the 6, the center-to-center distances for the connection elements are, however, 0.25 mm (.010 "). This allows wider conductors and wider spaces to be used, at least for one a large part of each section applies, which with increased processing effectiveness and higher yield. The number of connection elements for a section is, with forty instead of eighty, halved.

A protective layer can be applied over the connection elements 53 and 57 be applied.

The various layers for the strip 10, for the conductors 35 »39 and 44, and connectors 37, 38 and 43 in FIGS Figures 4 and 5i for conductors 50 »58 and 59» interconnection 60 and connecting elements 53 and 57 according to FIG. 6 are manufactured using processes which are already known and can be used as desired be designed as a thin film, thick film or in another form.

Thus, according to the invention, a thermal printing device is created, which has a continuous strip of electrically resistive material, with patterns of electrical conductors are arranged on both sides of the strip. From the conductor pattern, connections to the strip are at closely spaced apart Positions established. The ladder patterns are designed as columns on one side and rows on the other, to allow connections between the columns and the strip and the rows and the strip such that the Number of external connections is kept to a minimum. The connections that go from the conductor pattern to the strip, are offset on one side of the strip from the other side. This doubles the midpoint / Center-to-center distance of such connections compared to ■

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Connections that are opposite each other. This enables wider connection paths, while the original resolution is still retained.

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e e rs e j f e

Claims (12)

Claims 1./Thermo printing device with a continuous strip of electrically resistive material on a surface of a substrate made of electrically insulating material, characterized in that a first pattern is formed on the surface of the substrate (11) of electrical conductors (39> 44) is arranged, which extend along one side of the strip (10), the first electrical connection elements (38, 57) run from the first conductor pattern to the strip and in closely spaced, predetermined arrangement extending along the strip are connected to the strip (10), wherein the first pattern of electrical conductors (39, 44, 58, 60) comprises first and second groups of conductors, the second of which Group (44) overlying the first group (39) with a dielectric layer (41) interposed therebetween, DR. C. MANITZ DIPL.-INO. M. FINSTERWALD β MÖNCHEN 22. ROtERT-KOCH-STRASSE I TEL. (0891 22 43 11 TELEX 5-29672 PATMF 809842/0590 DIPL.-ING. W. GRAMKOW 7 STUTTGART 50. (BAD CANNSTATT) SEELBERGSTR. 23/25. TEL. (0711 156 72 ORIGINAL INSPECTED CENTRAL TICKET OFFICE BAYER. VOLKSBANKEN MÖNCHEN. ACCOUNT NUMBER ER 7270 POSTSCHECKi MUNICH 77062-805 and a plurality of electrically separated from each other Forms columns, with a plurality of the first electrical connection elements (38, 57) juxtaposed with each other the columns extending to the strip (10) of electrically resistive material and alternating with the first and the second group of conductors is connected that a second electrical conductor pattern (35 »50) on the Ooerflache des Substrate is arranged and the other side of the strip (10) runs along, while second electrical connection elements (37> 53) »which run from the second conductor pattern to the strip, on the strip in closely spaced, predetermined, are connected along the strip extending arrangement, wherein the second electrical connection elements (37, 53) are connected to the strip (10) at points which lie between those points in which the first electrical connection elements (38, 57) are connected to the strip (10) that the second electrical conductor pattern (35 »50) comprising a plurality of rows, each of which is electrically from different rows is separated, while a plurality of the second electrical connection elements (37 »53) from each of the rows to the strip, each electrical connection element (37 »53) of a row on the strip (10) opposite a first electrical connection element (38, 57) is connected, each with a different element of the columns is connected, while each row is connected by second electrical connection elements (37 »53) connected to the strip (10) at positions which are different from every other row, and that means (4-0, 45, 56, 61) for connecting an electrical Power supplies are provided to the conductor pattern in order to generate electrical heated areas in the strip To be able to apply power to selected electrical connectors on each side of the strip. 809842/0590 2. Thermal printing device according to claim 1, characterized in that the continuous Strip (10) comprises at least one applied thick film layer. 3 · thermal printing device according to claim 1 or 2, characterized in that the continuous Strip (10) comprises a plurality of layers arranged one above the other. 4, thermal printing device according to claim 1, 2 or 3, characterized characterized in that each of the first and second electrical conductor patterns (35 * 39 »44-, 50, 58, 60) comprises a thin film layer. 5 · Thermal printing device according to claim 1, 2 or 3, characterized in that each of the first and second electrical conductor pattern (35, 39, 44, 50, 58, 60) comprises a thick film layer. 6. Thermal printing device according to one of the preceding claims, characterized in that each of the first and second electrical connection elements (37, 38, 4-3, 53, 57) comprises a thin film layer. 7 · Thermal printing device according to one of Claims 1 to 5, characterized in that each of the first and second electrical connection elements (37, 38, 4-3, 53, 57) comprises a thick film layer. 8. Thermal printing device according to one of the preceding claims, characterized in that the first connection elements (38, 57) under a center / center dimension on the order of 0.254 mm (0.010 ") are connected to the strip (10), 809842/0590 and that the second connection elements (37 »53) on the strip (10) are attached to bodies that are opposite to those Points at which the first connection elements (38, 57) are connected to the strip are essentially the same Have distance. 9. A method for producing a thermal printing device, characterized in that on one side of an axis extending transversely over an electrically insulating substrate on the surface of this substrate, a first layer consisting of electrically conductive material is applied which is determined so that a plurality of first electrical connection elements (38, 57) is formed which extend perpendicular to the axis in a closely spaced, parallel order and the ends of which are adjacent to the axis, and in that a first group of electrical conductors (39 »58) is formed by each conductor is connected to a predetermined number of alternating first electrical connection elements (38, 57), that then over the first connection elements (38, 57) and the first group of first electrical conductors (39 »58) an electrically insulating layer (41) is applied, which is determined so that the ends of the first electrical connection elements (38, 57) exposed gen that then a second layer of electrically conductive material is applied to the electrically insulating layer (41) to form a second group of first electrical conductors (44, 60) which are connected to those electrical connection elements (38, 37) which are between the first electrical connection elements (38, 57) »which are connected to the first group of electrical conductors (39» 58), the first electrical connection elements (38, 57) and the first and second groups of first electrical conductors (39, 44 , 58, 60) a first electrical conductor pattern on the surface of the substrate on one side 809842/0590 Form side of the axis that further on the other side of the axis on the surface of the substrate a second Electrical conductor pattern is formed, which comprises a plurality of electrical connection elements (37 »^ 3» 53), which extending perpendicular to the axis in a closely spaced, parallel order, and a plurality of second conductors (35 » 50), which are electrically separated from one another and form a plurality of rows, with every other conductor (35-50) to a separate predetermined number of second connection elements (37, 43, 53) is connected while the ends the connection elements (38, 57) of the first conductor pattern in are arranged in the middle position to the ends of the connection elements (37? 43 »53) of the second conductor pattern, that the second electrical conductor pattern is formed by a layer of electrically conductive material to form the plurality of second electrical conductors (35 »50) is applied to the substrate that An electrically insulating layer (36, 51) is applied over the second connection elements (37 »53) in such a way that the Ends of the second connection elements (37 »53) are exposed that openings (42) through the insulating layer (36) to Formation of a predetermined electrical connection pattern in a predetermined pattern that on the insulating layer a second layer of electrically conductive material for forming further electrical connection elements (43), which are connected to the second electrical connection elements (37), is formed, each of the second electrical conductors (35) having a predetermined number of further connecting elements (37 »^ 3) is electrically connected via the openings (42) in the insulating layer (36), and that a continuous strip (10) of electrically resistive material is applied along the axis so that the opposite ends of the Connection elements (37 »38, 53, 57) are covered. 809842/0590 10. The method according to claim 9, characterized in that the second electrical connection elements (37,43) with primary parts (37) and secondary parts (43) are formed, and that the primary parts (37), the second electrical conductor (35), the first electrical connection elements (38) and the first group (39) of the first electrical conductors through the first Layer of electrically conductive material are formed. 11. The method according to claim 10, characterized in that the secondary parts (43) of the second electrical connection elements and the second group (44) of the first electrical conductors through the second layer of electrically conductive material are formed, the secondary parts (43), the corresponding primary parts (37) and the second electrical conductor (35) interconnect. 12. The method according to claim 9, characterized in that at alternate ends of the second electrical conductor (50) Terminal surfaces (56) are formed. 809842/0590