JP2007185919A - Surface plate for printing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable the surface to be printed to be held at a proper position by absorbing unevenness on the rear surface of an article to be printed at the time of screen printing. <P>SOLUTION: On this surface plate A for printing, a subject to be printed is mounted at the time of screen printing, and stretchable movable pins 1 are arranged with a fixed interval at least in the printing region of the surface plate A. The surface plate A for printing has a structure in which the height of the movable pins 1 stretches in response to the uneven shape of the surface on the opposite side from the surface 100a to be printed of the subject 100 to be printed. The movable pin 1 has a structure in which a movable section is supported by an elastic body, and the height of a section to be printed on the surface 100a to be printed is kept in a fixed range by the weight of the subject 100 to be printed, or by the weight of the subject 100 to be printed and the printing pressure at the time of printing. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a printing surface plate on which a printing material is placed during screen printing.

  When printing an uneven article by a so-called silk screen method, conventionally, as shown in FIG. 10, the substrate 300 cannot be stably placed on the surface plate 400 due to the convex portion 301 of the substrate 300. The upper surface 302 serving as the printing surface is inclined without being positioned on the same plane. Therefore, when the squeegee is pressed against the printing surface (upper surface) 302 of the substrate 300 during printing, there is a problem that it is difficult to apply a certain printing pressure to the printing surface 302 due to rattling of the substrate 300.

  In order to solve such a problem, a device devised so that the printing surface of the printing material is positioned on the same plane has been proposed (see, for example, Patent Documents 1 and 2).

  A fixing device for a substrate or the like described in Patent Document 1 includes a suction cup that sucks a substrate or the like placed on the upper surface of a base, a spring that normally biases the suction cup in an upward direction, and one end connected to the suction cup. And a vacuum pump. That is, when the vacuum pump is activated, the suction cup descends against the urging force of the spring, so that a strong adsorption force is obtained by the contraction of the suction cup and the return force of the spring due to the suction cup lowering. As a result, the substrate is warped. Even if it is a hollow substrate or the like having a slight unevenness on the surface of the insulating layer, it is possible to perform accurate screen printing without causing printing unevenness or printing displacement.

In addition, the circuit board receiving jig described in Patent Document 2 has a recess formed on the surface of the jig so as to avoid circuit parts attached to the support surface of the circuit board, and the remaining surface is formed. It is formed by a plane. Therefore, when the circuit board is placed on the receiving jig having such a structure and screen printing is performed, the circuit board is stably placed on the surface of the receiving jig, such as a mounter or a squeegee. The pressure can be applied to the circuit board at a constant pressure.
Japanese Utility Model Publication No. 1-127833 Japanese Utility Model Publication No. 4-87700

  However, the fixing device of the above cited reference 1 has a problem that it cannot be used when a circuit component or the like is attached to the support surface side of the substrate. Further, in the receiving jig of the above cited reference 2, since a concave portion is formed on the jig surface according to the circuit component attached to the support surface of the circuit board, a dedicated fixing device for each circuit component is provided. There was a problem that it was necessary to produce and lacked versatility.

  The present invention was devised to solve such problems, and its purpose is to be versatile in that it can absorb irregularities on the back side of the printed material and keep the printed surface in an appropriate position during screen printing. It is to provide an excellent printing surface plate.

  In order to solve the above-mentioned problem, the printing surface plate of the present invention is to place a substrate to be printed at the time of screen printing, and expandable pins are arranged at regular intervals in at least a printing region of the surface plate, The height of these pins expands and contracts according to the concavo-convex shape of the surface opposite to the surface to be printed of the substrate.

  Here, the extendable pin structure can be configured as follows.

  For example, the pin has a structure in which the movable part is supported by an elastic body. Thereby, it can be set as the structure where the height of the printed part of a to-be-printed surface is kept in a fixed range with the weight of to-be-printed material or the weight of to-be-printed material, and the printing pressure at the time of printing.

  Alternatively, the pin structure may be a cylinder structure that expands and contracts by hydraulic pressure, and the cylinder structure may include a pipe that supplies hydraulic fluid to the cylinder at an appropriate pressure and a pressurizing device. Thereby, by adjusting the pressure of the hydraulic fluid, the height of the printed portion of the printing surface can be kept within a certain range. Furthermore, the pin structure may include a piezo element and its associated device. Thereby, by adjusting the voltage applied to the piezo element, the height of the printed portion of the printing surface can be kept within a certain range.

  In addition, when the pin structure is a cylinder structure, a support member that supports the substrate to be printed from the side opposite to the surface on which the pin contacts may be disposed when adjusting the expansion / contraction amount of the pin. This support member is a flat plate. In this way, when the support member is arranged and the pressure of the hydraulic fluid is adjusted by the pressurizing device, the force with which each pin supports the printing material is uniform over the entire surface according to Pascal's theorem. The height falls within a certain range. Furthermore, in this state, it is good also as a structure further equipped with the fixing means which fixes the pressure of the said hydraulic fluid to the pressure after adjustment. Thus, by fixing the pressure of the hydraulic fluid to the adjusted pressure, the sinking of the pin due to the squeegee pressure can be prevented.

  In this case, the support member also has the same structure as the pin structure disposed on the printing surface plate. That is, a pin structure that can be expanded and contracted may be configured such that these pins are arranged to face each other via a printing material.

  Further, according to the printing surface plate of the present invention, when adjusting the expansion / contraction amount of the pins of the printing surface plate, the height position of the printing surface placed in the printing area of the printing surface plate is measured. Measuring means for adjusting, and adjusting the amount of expansion and contraction of the pin based on the measurement value of the measuring means, so that the height of the printed portion of the printing surface is maintained within a certain range. Also good. In this way, the flatness of the printing surface can be maintained by adjusting the amount of expansion / contraction for each pin or for each fixed zone by the measuring means, and the printing pressure during printing can be stabilized. Can do.

  Since the printing surface plate of the present invention is configured as described above, the unevenness on the back surface of the printing material is absorbed during screen printing, regardless of the shape of the unevenness on the back surface side of the printing material. The surface can be held in an appropriate position. That is, it is not necessary to prepare a dedicated printing surface plate according to the substrate to be printed, and it is not necessary to replace the printing surface plate when the printing content changes. In addition, there are various effects that printing can be stably performed even on a substrate to be printed that partially includes a flexible member.

  Embodiments of the present invention will be described below with reference to the drawings.

[Embodiment 1]
FIG. 1 is a side view showing the most basic schematic structure of a printing surface plate according to the present invention.

  The printing surface plate A according to the first embodiment has a configuration in which a large number of movable pins 1, 1,...

  As shown in FIG. 2, the movable pin 1 is housed in a cylindrical sleeve 11 and is provided so as to protrude upward from an insertion hole 12 formed in the upper surface of the sleeve 11. The lower end 1 a of the movable pin 1 is formed in a bowl shape, and an elastic body 14 such as a coil spring is inserted between the lower end 1 a and the inner bottom surface 13 of the sleeve 11. Thus, the movable pin 1 is supported by the elastic body 14 and has a structure that expands and contracts according to the pressure from above. Further, the sleeve 11 is fixed so as to be fitted into a recess 21 formed on the bottom surface of the frame 2, and an insertion hole 22 is formed in the recess 21 so that the movable pin 1 can protrude upward. .

  FIG. 3 shows a state in which the substrate 100 is placed on the printing surface plate A.

  Due to the weight of the printing material 100, the movable pin 1 sinks, and the height of the printing surface 100a is within a certain range.

  In such a situation, the substrate 100 needs to have a certain weight, and if it is light, the movable pin 1 does not sink sufficiently, and this situation may not occur.

  However, when performing printing, the squeegee is pressed against the printing surface 100a so that a certain printing pressure is applied. Therefore, as long as the repulsive force of the elastic body 14 that pushes up the movable pin 1 is equal to or lower than the printing pressure. Even if there is a convex portion 101 such as a circuit component on the lower surface side of the printed material 100, the height of the printing surface 100a can be maintained at a constant position, and printing can be performed with a constant printing pressure.

[Embodiment 2]
Although the movable pin 1 is supported by the elastic body 14 in the first embodiment, the printing surface plate B of the second embodiment has a feature in that a hydraulic pressure is used as a structure for supporting the movable pin 1. ing. When performing screen printing, what is important is that each part of the printing surface is on the same plane and that the printing pressure is always constant during printing.

  In the second embodiment, as shown in FIG. 4, the expansion and contraction structure of the movable pin 1 is an expansion and contraction structure by a hydraulic cylinder 31, and each liquid is connected by connecting the hydraulic cylinder 31 to a main pipe 33 by a pipe 32. In a state where the pressure cylinders 31 are connected to each other, the main pipe 33 is connected to a hydraulic fluid tank (pressure adjusting unit) 34 capable of adjusting the pressure. Although the shape of the movable pin 1 is the same as the shape of the first embodiment, in the second embodiment, since a hydraulic pressure is used, a ring-shaped stopper is provided on the outer peripheral portion of the lower end portion 1a of the movable pin 1. The water member 1b is fitted, and a water-tight structure is adopted so that the liquid does not leak from the space between the inner peripheral wall of the hydraulic cylinder 31.

  By placing the substrate 100 on the printing platen B having such a structure and adjusting the pressure on the hydraulic fluid tank 34 side, the force that each movable pin 1 supports the substrate 100 is covered by Pascal's theorem. As a result, the printed surface 100a is uniform over the entire surface of the printed material 100, and as a result, the printed surface 100a is within a certain range of height. If printing is performed in such a state, printing at a desired printing pressure can be performed.

  FIG. 5 shows another embodiment when pressure adjustment is performed on the hydraulic fluid tank 34 side. That is, in this embodiment, after placing the printing material 100 on the printing surface plate B, the printing board 100 side of the printing material 100 is pressed by the backup board 51, and the pressure is adjusted on the hydraulic fluid tank 34 side in this state. By performing Pascal's theorem, the force with which each movable pin 1 supports the printing material 100 becomes uniform over the entire surface of the printing material 100, and at the same time, the printing surface 100a falls within a certain range of height. If printing is performed in such a state, printing at a desired printing pressure can be performed.

  Further, in order to prevent the movable pin 1 from sinking and undulating the printing surface 100a at the time of printing with the squeegee pressure, an opening / closing valve (not shown) is provided at the root portion of the pipe 32 of the hydraulic cylinder 31 of each movable pin 1, and the printing surface When the flatness of 100a is ensured, this on-off valve may be closed. Thereby, since it can prevent that hydraulic fluid moves between the hydraulic cylinders 31 of each movable pin 1 after that, the sinking of the movable pin 1 by the influence of squeegee pressure can be prevented reliably.

  Such adjustment of the amount of expansion / contraction of the movable pin 1 may be performed every time during printing. However, when the substrate 100 having the same shape continues, the adjustment of the expansion / contraction of the movable pin 1 is performed first, and the position thereof is adjusted. Then, the movable pin 1 may be fixed and the subsequent product may be printed.

[Embodiment 3]
In the case where the printed material 100 has low rigidity and the printed surface 100a side is uneven, for example, a film-like material, the flexible portion 102 of the printed material 100 is pushed up as shown in FIG. It becomes a shape. In general, when the flexible portion 102 is pushed up so as to be attached to the screen plate film 3 and has the same height as the printing surface, stabilization of printing pressure, smoothness of squeegee transportation, etc. It is effective in terms. This point is difficult to realize with the surface plate engraving method described in the prior art (see Patent Document 2), and is also an advantage of the pin method of the present invention.

  However, when the flexible portion 102 of the substrate 100 is pushed up and deformed, the substrate 100 may be damaged.

  In the third embodiment, as a countermeasure for such a case, instead of the flat backup board 51 used in the second embodiment, as shown in FIG. A backup pin 60 having the same expansion / contraction structure as the expansion / contraction structure is used.

  The backup pin 60 is housed inside a cylindrical hydraulic cylinder 61 and is provided so as to protrude downward from an insertion hole 62 formed in the lower surface of the hydraulic cylinder 61. The upper end portion 60 a of the backup pin 60 is formed in a bowl shape, and a ring-shaped water stop member 60 b is fitted into the outer peripheral portion of the upper end portion 60 a so that liquid does not leak from the inner peripheral wall of the hydraulic cylinder 61. It has a watertight structure. The hydraulic cylinder 61 is connected to the main pipe 33a by the pipe 32a so that the main pipes 33a are connected to the hydraulic fluid tank 34 in a state where the hydraulic cylinders 61 are connected to each other. Further, the hydraulic cylinder 61 is fixed so as to be fitted into a recess 71 formed on the upper surface of the frame 70, and an insertion hole 72 is provided on the bottom surface of the recess 71 so that the backup pin 60 can protrude downward. Is formed.

  The backup pin 60 having such a structure is arranged in a one-to-one correspondence with the movable pin 1 provided on the printing surface plate B as shown in FIG. Since the substrate 100 is pressed from above, the substrate 100 can be more reliably prevented from wavy and deformed.

[Embodiment 4]
The fourth embodiment is an embodiment in which the amount of expansion / contraction of the movable pin 1 is controlled while actually checking the flatness of the printing surface 100a.

  That is, in the fourth embodiment, as shown in FIG. 9, the printing material 100 is placed on the printing surface plate B of the third embodiment, and the surface is optically scanned by the measuring device 81 to increase the height of each part. Measure. Then, by adjusting the hydraulic pressure of each movable pin or the hydraulic pressure of each of the movable pins 1, 1... In a certain zone with this optical sensor output, the expansion / contraction amount of the movable pin 1 is controlled. The flatness of the printing surface 100a of the printing material 100 is maintained. Thereby, the printing pressure at the time of printing can be stabilized and good printing can be performed. Here, in the fourth embodiment, a scanning rangefinder using a laser beam is used as the measuring device 81. Since this scan rangefinder is well known in the art, a detailed description thereof is omitted here.

  In the fourth embodiment, the expansion / contraction structure of the movable pin 1 is described as the same structure as the expansion / contraction structure by the hydraulic pressure of the second embodiment. However, the expansion / contraction structure is not limited to the expansion / contraction structure by the hydraulic pressure. It is possible to control the amount of expansion and contraction of the movable pin 1 using an electric drive system or a mechanical drive system. For example, although not shown in the drawings, as a printing platen, by using the piezo element instead of the hydraulic cylinder, by fixing the other end of the piezo element with one end fixed to the movable pin to the frame, A configuration may be provided in which a piezo element control device that applies a voltage to the piezo element to control the amount of expansion and contraction of the movable pin is provided. Then, the flatness of the printing surface of the printing material may be maintained by adjusting the voltage applied to the piezo element by the piezo element control device to control the expansion / contraction amount of the movable pin. Thereby, the printing pressure at the time of printing can be stabilized and good printing can be performed.

FIG. 3 is a side view showing a schematic structure of a printing platen according to the first embodiment. 3 is an enlarged cross-sectional view illustrating a structure of a movable pin portion of the printing surface plate of Embodiment 1. FIG. FIG. 3 is a side view illustrating a state in which a substrate is placed on the printing surface plate of the first embodiment. It is explanatory drawing which shows the movable pin structure of the surface plate for printing of Embodiment 2 in a partially expanded cross section. It is a side view which shows other embodiment at the time of performing pressure adjustment on the hydraulic fluid tank side. It is a side view which shows the use condition of the surface plate for printing of Embodiment 3. It is an expanded sectional view which shows the structure of the movable pin part of the surface plate for printing of Embodiment 3. FIG. It is a side view which shows the other use condition of the printing surface plate of Embodiment 3. It is a side view which shows the use condition of the surface plate for printing of Embodiment 4. It is explanatory drawing which shows the state which put the to-be-printed object on the conventional surface plate for printing.

Explanation of symbols

A, B Surface plate for printing 1 Movable pin 1a Lower end 2 Frame 4 Screen plate film 11 Sleeve 12 Insertion hole 13 Bottom surface 14 Elastic body 21 Recessed part 31 Hydraulic cylinder 31a On-off valve 32, 32a Piping 33, 33a Main piping 34 Working fluid Tank (pressure adjustment part)
Reference Signs List 51 backup board 60 backup pin 60a lower end 60b water stop member 61 hydraulic cylinder 62 insertion hole 70 frame 71 recess 72 insertion hole 81 measuring device 100 printed material 100a printing surface 101 convex portion 102 flexible portion

Claims (9)

A printing surface plate for placing an object to be printed during screen printing,
Stretchable pins are arranged at regular intervals in at least the printing region of the surface plate, and the height of these pins expands and contracts in accordance with the concavo-convex shape of the surface opposite to the surface to be printed. Surface plate for printing.   The pin has a structure in which a movable part is supported by an elastic body, and the height of the printed portion of the printing surface is within a certain range depending on the weight of the printing material or the weight of the printing material and the printing pressure at the time of printing. The printing platen according to claim 1, wherein the printing platen is maintained inside.   The pin structure has a cylinder structure that expands and contracts by hydraulic pressure, and the cylinder structure includes a pipe that supplies hydraulic fluid to the cylinder at an appropriate pressure and a pressurizing device, and adjusts the pressure of the hydraulic fluid. 2. The printing platen according to claim 1, wherein the height of the printed portion of the printing surface is maintained within a certain range.   The pin structure includes a piezo element and a control device for the piezo element, and adjusts a voltage applied to the piezo element to maintain a height of a printed portion of the printed surface within a certain range. Item 10. A printing surface plate according to Item 1.   The printing platen according to any one of claims 1 to 3, wherein a support member that supports the substrate to be printed from a side opposite to a surface on which the pin abuts is disposed when adjusting the expansion / contraction amount of the pin. .   The printing surface plate according to claim 5, wherein the support member is a flat plate.   The said support member is a stretchable pin structure having a structure similar to that of the pin disposed on the printing surface plate, and these pins are disposed to face each other via a printing material. Surface plate for printing.   When adjusting the amount of expansion and contraction of the pins of the printing platen, the measuring plate is provided with a measuring unit that measures the height position of the printing surface placed in the printing area of the printing platen, and the measuring unit measures 5. The height of a printed portion of a printing surface is maintained within a certain range by adjusting an amount of expansion / contraction of the pin based on a value. Surface plate for printing.   The printing platen according to claim 3, further comprising a fixing unit that fixes the pressure of the hydraulic fluid to the adjusted pressure.

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